AI Trajectory

Trajectory: (Expand/Collapse All)
Seq	Timestamp	Type	Name	Duration
0/0	2026/10/09 11:01	flow	patch-triage	5m Args: null Results: { "EnableConfigs": null, "FocusSymbols": [], "KMSANReasoning": "", "NeedsKMSAN": false, "Reasoning": "The patch series modifies the NC-SI (Network Controller Sideband Interface) stack in net/ncsi/ and the Faraday FTGMAC100 Ethernet driver in drivers/net/ethernet/faraday/ftgmac100.c to improve locking and lifecycle synchronization. FTGMAC100 is an ARM-specific platform driver for Faraday and Aspeed AST2400/2500/2600 BMC SoCs, depending on (ARM \|\| COMPILE_TEST) \u0026\u0026 (!64BIT \|\| BROKEN), and cannot run on amd64 in standard QEMU/virtualized environments. FTGMAC100 is the sole caller of ncsi_register_dev() in the entire Linux kernel; no virtual or x86 device supports NC-SI. Consequently, no NC-SI device can ever be registered on amd64. While the generic netlink interface (NCSI family) is exposed if CONFIG_NET_NCSI is enabled, all netlink handlers immediately return -ENODEV during device lookup (ndp_from_ifindex), leaving all modified channel management, state machines, packet handling, and synchronization logic structurally unreachable.", "WorthFuzzing": false }
1/1	2026/10/09 11:01	action	read-patch-diff	0m Args: null Results: { "PatchDiff": "commit 2f66c2f776bce5adc47b25a424d9d8e2da88a402\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate: Fri Oct 9 11:01:30 2026 +0000\n\n syz-cluster: applied patch under review\n\ndiff --git a/drivers/net/ethernet/faraday/ftgmac100.c b/drivers/net/ethernet/faraday/ftgmac100.c\nindex 6d2fe5c2f3903..f45388810570d 100644\n--- a/drivers/net/ethernet/faraday/ftgmac100.c\n+++ b/drivers/net/ethernet/faraday/ftgmac100.c\n@@ -2094,8 +2094,10 @@ static int ftgmac100_probe(struct platform_device pdev)\n \n err:\n \tftgmac100_phy_disconnect(netdev);\n-\tif (priv-\u003endev)\n+\tif (priv-\u003endev) {\n \t\tncsi_unregister_dev(priv-\u003endev);\n+\t\tpriv-\u003endev = NULL;\n+\t}\n \treturn err;\n }\n \n@@ -2108,8 +2110,12 @@ static void ftgmac100_remove(struct platform_device pdev)\n \tpriv = netdev_priv(netdev);\n \n \tif (priv-\u003endev)\n-\t\tncsi_unregister_dev(priv-\u003endev);\n+\t\tncsi_unregister_dev_prepare(priv-\u003endev);\n \tunregister_netdev(netdev);\n+\tif (priv-\u003endev) {\n+\t\tncsi_unregister_dev(priv-\u003endev);\n+\t\tpriv-\u003endev = NULL;\n+\t}\n \n \t/* There's a small chance the reset task will have been re-queued,\n \t * during stop, make sure it's gone before we free the structure.\ndiff --git a/include/net/ncsi.h b/include/net/ncsi.h\nindex e886358207aac..049c02b61169e 100644\n--- a/include/net/ncsi.h\n+++ b/include/net/ncsi.h\n@@ -37,6 +37,11 @@ struct ncsi_dev ncsi_register_dev(struct net_device dev,\n \t\t\t\t void (notifier)(struct ncsi_dev nd));\n int ncsi_start_dev(struct ncsi_dev nd);\n void ncsi_stop_dev(struct ncsi_dev nd);\n+/\n+ Remove NCSI lookups and packet reception before unregistering the netdev.\n+ * The object remains valid until ncsi_unregister_dev() completes teardown.\n+ /\n+void ncsi_unregister_dev_prepare(struct ncsi_dev nd);\n void ncsi_unregister_dev(struct ncsi_dev nd);\n #else / !CONFIG_NET_NCSI /\n static inline int ncsi_vlan_rx_add_vid(struct net_device dev, __be16 proto, u16 vid)\n@@ -64,6 +69,10 @@ static inline void ncsi_stop_dev(struct ncsi_dev nd)\n {\n }\n \n+static inline void ncsi_unregister_dev_prepare(struct ncsi_dev nd)\n+{\n+}\n+\n static inline void ncsi_unregister_dev(struct ncsi_dev nd)\n {\n }\ndiff --git a/net/ncsi/internal.h b/net/ncsi/internal.h\nindex adee6dcabdc3f..8a53e6ccbd9ac 100644\n--- a/net/ncsi/internal.h\n+++ b/net/ncsi/internal.h\n@@ -6,6 +6,8 @@\n #ifndef __NCSI_INTERNAL_H__\n #define __NCSI_INTERNAL_H__\n \n+#include \u003clinux/mutex.h\u003e\n+\n enum {\n \tNCSI_CAP_BASE\t\t= 0,\n \tNCSI_CAP_GENERIC\t= 0,\n@@ -310,12 +312,14 @@ enum {\n \n struct vlan_vid {\n \tstruct list_head list;\n+\tstruct rcu_head rcu;\n \t__be16 proto;\n \tu16 vid;\n };\n \n struct ncsi_dev_priv {\n \tstruct ncsi_dev ndev; / Associated NCSI device /\n+\tbool unregister_prepared;\n \tunsigned int flags; / NCSI device flags /\n #define NCSI_DEV_PROBED\t\t1 / Finalized NCSI topology /\n #define NCSI_DEV_HWA\t\t2 / Enabled HW arbitration /\n@@ -367,6 +371,7 @@ struct ncsi_cmd_arg {\n \n extern struct list_head ncsi_dev_list;\n extern spinlock_t ncsi_dev_lock;\n+extern struct mutex ncsi_dev_mutex;\n \n #define TO_NCSI_DEV_PRIV(nd) \\\n \tcontainer_of(nd, struct ncsi_dev_priv, ndev)\ndiff --git a/net/ncsi/ncsi-aen.c b/net/ncsi/ncsi-aen.c\nindex 040a31557201b..c3614f0648649 100644\n--- a/net/ncsi/ncsi-aen.c\n+++ b/net/ncsi/ncsi-aen.c\n@@ -64,7 +64,8 @@ static int ncsi_aen_handler_lsc(struct ncsi_dev_priv ndp,\n \t/* Update the link status /\n \tlsc = (struct ncsi_aen_lsc_pkt )h;\n \n-\tspin_lock_irqsave(\u0026nc-\u003elock, flags);\n+\tspin_lock_irqsave(\u0026ndp-\u003elock, flags);\n+\tspin_lock(\u0026nc-\u003elock);\n \tncm = \u0026nc-\u003emodes[NCSI_MODE_LINK];\n \told_data = ncm-\u003edata[2];\n \tdata = ntohl(lsc-\u003estatus);\n@@ -79,7 +80,8 @@ static int ncsi_aen_handler_lsc(struct ncsi_dev_priv ndp,\n \n \tchained = !list_empty(\u0026nc-\u003elink);\n \tstate = nc-\u003estate;\n-\tspin_unlock_irqrestore(\u0026nc-\u003elock, flags);\n+\tspin_unlock(\u0026nc-\u003elock);\n+\tspin_unlock_irqrestore(\u0026ndp-\u003elock, flags);\n \n \tif (state == NCSI_CHANNEL_INACTIVE)\n \t\tnetdev_warn(ndp-\u003endev.dev,\n@@ -94,7 +96,11 @@ static int ncsi_aen_handler_lsc(struct ncsi_dev_priv ndp,\n \t\t\tndp-\u003eflags \|= NCSI_DEV_RESHUFFLE;\n \t\t\tncsi_stop_channel_monitor(nc);\n \t\t\tspin_lock_irqsave(\u0026ndp-\u003elock, flags);\n-\t\t\tlist_add_tail_rcu(\u0026nc-\u003elink, \u0026ndp-\u003echannel_queue);\n+\t\t\tspin_lock(\u0026nc-\u003elock);\n+\t\t\tif (nc-\u003estate == NCSI_CHANNEL_ACTIVE \u0026\u0026\n+\t\t\t list_empty(\u0026nc-\u003elink))\n+\t\t\t\tlist_add_tail_rcu(\u0026nc-\u003elink, \u0026ndp-\u003echannel_queue);\n+\t\t\tspin_unlock(\u0026nc-\u003elock);\n \t\t\tspin_unlock_irqrestore(\u0026ndp-\u003elock, flags);\n \t\t\treturn ncsi_process_next_channel(ndp);\n \t\t}\n@@ -148,22 +154,28 @@ static int ncsi_aen_handler_cr(struct ncsi_dev_priv ndp,\n \tif (!nc)\n \t\treturn -ENODEV;\n \n-\tspin_lock_irqsave(\u0026nc-\u003elock, flags);\n+\tspin_lock_irqsave(\u0026ndp-\u003elock, flags);\n+\tspin_lock(\u0026nc-\u003elock);\n \tif (!list_empty(\u0026nc-\u003elink) \|\|\n \t nc-\u003estate != NCSI_CHANNEL_ACTIVE) {\n-\t\tspin_unlock_irqrestore(\u0026nc-\u003elock, flags);\n+\t\tspin_unlock(\u0026nc-\u003elock);\n+\t\tspin_unlock_irqrestore(\u0026ndp-\u003elock, flags);\n \t\treturn 0;\n \t}\n-\tspin_unlock_irqrestore(\u0026nc-\u003elock, flags);\n+\tspin_unlock(\u0026nc-\u003elock);\n+\tspin_unlock_irqrestore(\u0026ndp-\u003elock, flags);\n \n \tncsi_stop_channel_monitor(nc);\n-\tspin_lock_irqsave(\u0026nc-\u003elock, flags);\n-\tnc-\u003estate = NCSI_CHANNEL_INVISIBLE;\n-\tspin_unlock_irqrestore(\u0026nc-\u003elock, flags);\n-\n \tspin_lock_irqsave(\u0026ndp-\u003elock, flags);\n+\tspin_lock(\u0026nc-\u003elock);\n+\tif (nc-\u003estate != NCSI_CHANNEL_ACTIVE \|\| !list_empty(\u0026nc-\u003elink)) {\n+\t\tspin_unlock(\u0026nc-\u003elock);\n+\t\tspin_unlock_irqrestore(\u0026ndp-\u003elock, flags);\n+\t\treturn 0;\n+\t}\n \tnc-\u003estate = NCSI_CHANNEL_INACTIVE;\n \tlist_add_tail_rcu(\u0026nc-\u003elink, \u0026ndp-\u003echannel_queue);\n+\tspin_unlock(\u0026nc-\u003elock);\n \tspin_unlock_irqrestore(\u0026ndp-\u003elock, flags);\n \tnc-\u003emodes[NCSI_MODE_TX_ENABLE].enable = 0;\n \ndiff --git a/net/ncsi/ncsi-manage.c b/net/ncsi/ncsi-manage.c\nindex 54d0df0a9efe6..c74e93b1b222b 100644\n--- a/net/ncsi/ncsi-manage.c\n+++ b/net/ncsi/ncsi-manage.c\n@@ -10,6 +10,7 @@\n #include \u003clinux/skbuff.h\u003e\n #include \u003clinux/of.h\u003e\n #include \u003clinux/platform_device.h\u003e\n+#include \u003clinux/mutex.h\u003e\n \n #include \u003cnet/ncsi.h\u003e\n #include \u003cnet/net_namespace.h\u003e\n@@ -24,6 +25,7 @@\n \n LIST_HEAD(ncsi_dev_list);\n DEFINE_SPINLOCK(ncsi_dev_lock);\n+DEFINE_MUTEX(ncsi_dev_mutex);\n \n bool ncsi_channel_has_link(struct ncsi_channel channel)\n {\n@@ -64,21 +66,25 @@ static void ncsi_report_link(struct ncsi_dev_priv ndp, bool force_down)\n \tnd-\u003elink_up = 0;\n \tNCSI_FOR_EACH_PACKAGE(ndp, np) {\n \t\tNCSI_FOR_EACH_CHANNEL(np, nc) {\n-\t\t\tspin_lock_irqsave(\u0026nc-\u003elock, flags);\n+\t\t\tspin_lock_irqsave(\u0026ndp-\u003elock, flags);\n+\t\t\tspin_lock(\u0026nc-\u003elock);\n \n \t\t\tif (!list_empty(\u0026nc-\u003elink) \|\|\n \t\t\t nc-\u003estate != NCSI_CHANNEL_ACTIVE) {\n-\t\t\t\tspin_unlock_irqrestore(\u0026nc-\u003elock, flags);\n+\t\t\t\tspin_unlock(\u0026nc-\u003elock);\n+\t\t\t\tspin_unlock_irqrestore(\u0026ndp-\u003elock, flags);\n \t\t\t\tcontinue;\n \t\t\t}\n \n \t\t\tif (ncsi_channel_has_link(nc)) {\n-\t\t\t\tspin_unlock_irqrestore(\u0026nc-\u003elock, flags);\n+\t\t\t\tspin_unlock(\u0026nc-\u003elock);\n+\t\t\t\tspin_unlock_irqrestore(\u0026ndp-\u003elock, flags);\n \t\t\t\tnd-\u003elink_up = 1;\n \t\t\t\tgoto report;\n \t\t\t}\n \n-\t\t\tspin_unlock_irqrestore(\u0026nc-\u003elock, flags);\n+\t\t\tspin_unlock(\u0026nc-\u003elock);\n+\t\t\tspin_unlock_irqrestore(\u0026ndp-\u003elock, flags);\n \t\t}\n \t}\n \n@@ -98,12 +104,14 @@ static void ncsi_channel_monitor(struct timer_list t)\n \tunsigned long flags;\n \tint state, ret;\n \n-\tspin_lock_irqsave(\u0026nc-\u003elock, flags);\n+\tspin_lock_irqsave(\u0026ndp-\u003elock, flags);\n+\tspin_lock(\u0026nc-\u003elock);\n \tstate = nc-\u003estate;\n \tchained = !list_empty(\u0026nc-\u003elink);\n \tenabled = nc-\u003emonitor.enabled;\n \tmonitor_state = nc-\u003emonitor.state;\n-\tspin_unlock_irqrestore(\u0026nc-\u003elock, flags);\n+\tspin_unlock(\u0026nc-\u003elock);\n+\tspin_unlock_irqrestore(\u0026ndp-\u003elock, flags);\n \n \tif (!enabled)\n \t\treturn;\t\t/* expected race disabling timer /\n@@ -151,8 +159,11 @@ static void ncsi_channel_monitor(struct timer_list t)\n \t\tspin_unlock_irqrestore(\u0026nc-\u003elock, flags);\n \n \t\tspin_lock_irqsave(\u0026ndp-\u003elock, flags);\n+\t\tspin_lock(\u0026nc-\u003elock);\n \t\tnc-\u003estate = NCSI_CHANNEL_ACTIVE;\n-\t\tlist_add_tail_rcu(\u0026nc-\u003elink, \u0026ndp-\u003echannel_queue);\n+\t\tif (list_empty(\u0026nc-\u003elink))\n+\t\t\tlist_add_tail_rcu(\u0026nc-\u003elink, \u0026ndp-\u003echannel_queue);\n+\t\tspin_unlock(\u0026nc-\u003elock);\n \t\tspin_unlock_irqrestore(\u0026ndp-\u003elock, flags);\n \t\tncsi_process_next_channel(ndp);\n \t\treturn;\n@@ -182,13 +193,10 @@ void ncsi_stop_channel_monitor(struct ncsi_channel nc)\n \tunsigned long flags;\n \n \tspin_lock_irqsave(\u0026nc-\u003elock, flags);\n-\tif (!nc-\u003emonitor.enabled) {\n-\t\tspin_unlock_irqrestore(\u0026nc-\u003elock, flags);\n-\t\treturn;\n-\t}\n \tnc-\u003emonitor.enabled = false;\n \tspin_unlock_irqrestore(\u0026nc-\u003elock, flags);\n \n+\t/ The callback may have cleared enabled and still be running. /\n \ttimer_delete_sync(\u0026nc-\u003emonitor.timer);\n }\n \n@@ -640,7 +648,7 @@ static int set_one_vid(struct ncsi_dev_priv ndp, struct ncsi_channel nc,\n \tunsigned long flags;\n \tint i, index;\n \tvoid bitmap;\n-\tu16 vid;\n+\tu16 vid = 0;\n \n \tif (list_empty(\u0026ndp-\u003evlan_vids))\n \t\treturn -1;\n@@ -1238,7 +1246,7 @@ static int ncsi_choose_active_channel(struct ncsi_dev_priv ndp)\n {\n \tstruct ncsi_channel nc, found, hot_nc;\n \tstruct ncsi_channel_mode ncm;\n-\tunsigned long flags, cflags;\n+\tunsigned long flags;\n \tstruct ncsi_package np;\n \tbool with_link;\n \n@@ -1260,11 +1268,13 @@ static int ncsi_choose_active_channel(struct ncsi_dev_priv ndp)\n \t\t\tif (!(np-\u003echannel_whitelist \u0026 (0x1 \u003c\u003c nc-\u003eid)))\n \t\t\t\tcontinue;\n \n-\t\t\tspin_lock_irqsave(\u0026nc-\u003elock, cflags);\n+\t\t\tspin_lock_irqsave(\u0026ndp-\u003elock, flags);\n+\t\t\tspin_lock(\u0026nc-\u003elock);\n \n \t\t\tif (!list_empty(\u0026nc-\u003elink) \|\|\n \t\t\t nc-\u003estate != NCSI_CHANNEL_INACTIVE) {\n-\t\t\t\tspin_unlock_irqrestore(\u0026nc-\u003elock, cflags);\n+\t\t\t\tspin_unlock(\u0026nc-\u003elock);\n+\t\t\t\tspin_unlock_irqrestore(\u0026ndp-\u003elock, flags);\n \t\t\t\tcontinue;\n \t\t\t}\n \n@@ -1285,10 +1295,8 @@ static int ncsi_choose_active_channel(struct ncsi_dev_priv ndp)\n \t\t\t * so they will have AENs enabled.\n \t\t\t /\n \t\t\tif (with_link \|\| np-\u003emulti_channel) {\n-\t\t\t\tspin_lock_irqsave(\u0026ndp-\u003elock, flags);\n \t\t\t\tlist_add_tail_rcu(\u0026nc-\u003elink,\n \t\t\t\t\t\t \u0026ndp-\u003echannel_queue);\n-\t\t\t\tspin_unlock_irqrestore(\u0026ndp-\u003elock, flags);\n \n \t\t\t\tnetdev_dbg(ndp-\u003endev.dev,\n \t\t\t\t\t \"NCSI: Channel %u added to queue (link %s)\\n\",\n@@ -1296,7 +1304,8 @@ static int ncsi_choose_active_channel(struct ncsi_dev_priv ndp)\n \t\t\t\t\t ncm-\u003edata[2] \u0026 0x1 ? \"up\" : \"down\");\n \t\t\t}\n \n-\t\t\tspin_unlock_irqrestore(\u0026nc-\u003elock, cflags);\n+\t\t\tspin_unlock(\u0026nc-\u003elock);\n+\t\t\tspin_unlock_irqrestore(\u0026ndp-\u003elock, flags);\n \n \t\t\tif (with_link \u0026\u0026 !np-\u003emulti_channel)\n \t\t\t\tbreak;\n@@ -1305,19 +1314,24 @@ static int ncsi_choose_active_channel(struct ncsi_dev_priv ndp)\n \t\t\tbreak;\n \t}\n \n+\tspin_lock_irqsave(\u0026ndp-\u003elock, flags);\n \tif (list_empty(\u0026ndp-\u003echannel_queue) \u0026\u0026 found) {\n \t\tnetdev_info(ndp-\u003endev.dev,\n \t\t\t \"NCSI: No channel with link found, configuring channel %u\\n\",\n \t\t\t found-\u003eid);\n-\t\tspin_lock_irqsave(\u0026ndp-\u003elock, flags);\n-\t\tlist_add_tail_rcu(\u0026found-\u003elink, \u0026ndp-\u003echannel_queue);\n-\t\tspin_unlock_irqrestore(\u0026ndp-\u003elock, flags);\n+\t\tspin_lock(\u0026found-\u003elock);\n+\t\tif (found-\u003estate == NCSI_CHANNEL_INACTIVE \u0026\u0026\n+\t\t list_empty(\u0026found-\u003elink))\n+\t\t\tlist_add_tail_rcu(\u0026found-\u003elink, \u0026ndp-\u003echannel_queue);\n+\t\tspin_unlock(\u0026found-\u003elock);\n \t} else if (!found) {\n+\t\tspin_unlock_irqrestore(\u0026ndp-\u003elock, flags);\n \t\tnetdev_warn(ndp-\u003endev.dev,\n \t\t\t \"NCSI: No channel found to configure!\\n\");\n \t\tncsi_report_link(ndp, true);\n \t\treturn -ENODEV;\n \t}\n+\tspin_unlock_irqrestore(\u0026ndp-\u003elock, flags);\n \n \treturn ncsi_process_next_channel(ndp);\n }\n@@ -1567,13 +1581,12 @@ int ncsi_process_next_channel(struct ncsi_dev_priv ndp)\n \t\tgoto out;\n \t}\n \n+\tspin_lock(\u0026nc-\u003elock);\n \tlist_del_init(\u0026nc-\u003elink);\n-\tspin_unlock_irqrestore(\u0026ndp-\u003elock, flags);\n-\n-\tspin_lock_irqsave(\u0026nc-\u003elock, flags);\n \told_state = nc-\u003estate;\n \tnc-\u003estate = NCSI_CHANNEL_INVISIBLE;\n-\tspin_unlock_irqrestore(\u0026nc-\u003elock, flags);\n+\tspin_unlock(\u0026nc-\u003elock);\n+\tspin_unlock_irqrestore(\u0026ndp-\u003elock, flags);\n \n \tndp-\u003eactive_channel = nc;\n \tndp-\u003eactive_package = nc-\u003epackage;\n@@ -1615,14 +1628,49 @@ int ncsi_process_next_channel(struct ncsi_dev_priv ndp)\n static int ncsi_kick_channels(struct ncsi_dev_priv ndp)\n {\n \tstruct ncsi_dev nd = \u0026ndp-\u003endev;\n+\tstruct ncsi_channel batch[NCSI_MAX_CHANNEL];\n+\tstruct ncsi_channel last = NULL;\n \tstruct ncsi_channel nc;\n \tstruct ncsi_package np;\n \tunsigned long flags;\n-\tunsigned int n = 0;\n+\tbool kicked;\n+\tunsigned int n = 0, count, i;\n \n-\tNCSI_FOR_EACH_PACKAGE(ndp, np) {\n-\t\tNCSI_FOR_EACH_CHANNEL(np, nc) {\n-\t\t\tspin_lock_irqsave(\u0026nc-\u003elock, flags);\n+\tlockdep_assert_held(\u0026ncsi_dev_mutex);\n+\n+\t/\n+\t * Keep the RCU read-side section limited to list traversal. Kicking a\n+\t * channel synchronously stops its monitor timer and must happen outside\n+\t * the read-side section. The caller holds ncsi_dev_mutex, so the package\n+\t * and channel objects remain alive while each batch is processed.\n+\t /\n+\tdo {\n+\t\tbool past_last = !last;\n+\n+\t\tcount = 0;\n+\t\trcu_read_lock();\n+\t\tNCSI_FOR_EACH_PACKAGE(ndp, np) {\n+\t\t\tNCSI_FOR_EACH_CHANNEL(np, nc) {\n+\t\t\t\tif (!past_last) {\n+\t\t\t\t\tif (nc == last)\n+\t\t\t\t\t\tpast_last = true;\n+\t\t\t\t\tcontinue;\n+\t\t\t\t}\n+\n+\t\t\t\tbatch[count++] = nc;\n+\t\t\t\tif (count == ARRAY_SIZE(batch)) {\n+\t\t\t\t\tlast = nc;\n+\t\t\t\t\tgoto batch_full;\n+\t\t\t\t}\n+\t\t\t}\n+\t\t}\n+batch_full:\n+\t\trcu_read_unlock();\n+\n+\t\tfor (i = 0; i \u003c count; i++) {\n+\t\t\tnc = batch[i];\n+\t\t\tspin_lock_irqsave(\u0026ndp-\u003elock, flags);\n+\t\t\tspin_lock(\u0026nc-\u003elock);\n \n \t\t\t/ Channels may be busy, mark dirty instead of\n \t\t\t * kicking if;\n@@ -1639,25 +1687,32 @@ static int ncsi_kick_channels(struct ncsi_dev_priv ndp)\n \t\t\t\t\t\t nc);\n \t\t\t\t\tnc-\u003ereconfigure_needed = true;\n \t\t\t\t}\n-\t\t\t\tspin_unlock_irqrestore(\u0026nc-\u003elock, flags);\n+\t\t\t\tspin_unlock(\u0026nc-\u003elock);\n+\t\t\t\tspin_unlock_irqrestore(\u0026ndp-\u003elock, flags);\n \t\t\t\tcontinue;\n \t\t\t}\n \n-\t\t\tspin_unlock_irqrestore(\u0026nc-\u003elock, flags);\n+\t\t\tspin_unlock(\u0026nc-\u003elock);\n+\t\t\tspin_unlock_irqrestore(\u0026ndp-\u003elock, flags);\n \n \t\t\tncsi_stop_channel_monitor(nc);\n-\t\t\tspin_lock_irqsave(\u0026nc-\u003elock, flags);\n-\t\t\tnc-\u003estate = NCSI_CHANNEL_INACTIVE;\n-\t\t\tspin_unlock_irqrestore(\u0026nc-\u003elock, flags);\n-\n \t\t\tspin_lock_irqsave(\u0026ndp-\u003elock, flags);\n-\t\t\tlist_add_tail_rcu(\u0026nc-\u003elink, \u0026ndp-\u003echannel_queue);\n+\t\t\tspin_lock(\u0026nc-\u003elock);\n+\t\t\tkicked = false;\n+\t\t\tif (nc-\u003estate == NCSI_CHANNEL_ACTIVE \u0026\u0026\n+\t\t\t list_empty(\u0026nc-\u003elink)) {\n+\t\t\t\tnc-\u003estate = NCSI_CHANNEL_INACTIVE;\n+\t\t\t\tlist_add_tail_rcu(\u0026nc-\u003elink, \u0026ndp-\u003echannel_queue);\n+\t\t\t\tkicked = true;\n+\t\t\t\tn++;\n+\t\t\t}\n+\t\t\tspin_unlock(\u0026nc-\u003elock);\n \t\t\tspin_unlock_irqrestore(\u0026ndp-\u003elock, flags);\n \n-\t\t\tnetdev_dbg(nd-\u003edev, \"NCSI: kicked channel %p\\n\", nc);\n-\t\t\tn++;\n+\t\t\tif (kicked)\n+\t\t\t\tnetdev_dbg(nd-\u003edev, \"NCSI: kicked channel %p\\n\", nc);\n \t\t}\n-\t}\n+\t} while (count == ARRAY_SIZE(batch));\n \n \treturn n;\n }\n@@ -1669,37 +1724,49 @@ int ncsi_vlan_rx_add_vid(struct net_device dev, __be16 proto, u16 vid)\n \tstruct vlan_vid vlan;\n \tstruct ncsi_dev nd;\n \tbool found = false;\n+\tint ret;\n \n \tif (vid == 0)\n \t\treturn 0;\n \n+\tmutex_lock(\u0026ncsi_dev_mutex);\n+\trcu_read_lock();\n \tnd = ncsi_find_dev(dev);\n+\trcu_read_unlock();\n \tif (!nd) {\n \t\tnetdev_warn(dev, \"NCSI: No net_device?\\n\");\n-\t\treturn 0;\n+\t\tret = 0;\n+\t\tgoto out_unlock;\n \t}\n \n \tndp = TO_NCSI_DEV_PRIV(nd);\n \n \t/* Add the VLAN id to our internal list /\n+\trcu_read_lock();\n \tlist_for_each_entry_rcu(vlan, \u0026ndp-\u003evlan_vids, list) {\n \t\tn_vids++;\n \t\tif (vlan-\u003evid == vid) {\n \t\t\tnetdev_dbg(dev, \"NCSI: vid %u already registered\\n\",\n \t\t\t\t vid);\n-\t\t\treturn 0;\n+\t\t\trcu_read_unlock();\n+\t\t\tret = 0;\n+\t\t\tgoto out_unlock;\n \t\t}\n \t}\n+\trcu_read_unlock();\n \tif (n_vids \u003e= NCSI_MAX_VLAN_VIDS) {\n \t\tnetdev_warn(dev,\n \t\t\t \"tried to add vlan id %u but NCSI max already registered (%u)\\n\",\n \t\t\t vid, NCSI_MAX_VLAN_VIDS);\n-\t\treturn -ENOSPC;\n+\t\tret = -ENOSPC;\n+\t\tgoto out_unlock;\n \t}\n \n \tvlan = kzalloc_obj(vlan);\n-\tif (!vlan)\n-\t\treturn -ENOMEM;\n+\tif (!vlan) {\n+\t\tret = -ENOMEM;\n+\t\tgoto out_unlock;\n+\t}\n \n \tvlan-\u003eproto = proto;\n \tvlan-\u003evid = vid;\n@@ -1709,45 +1776,60 @@ int ncsi_vlan_rx_add_vid(struct net_device dev, __be16 proto, u16 vid)\n \n \tfound = ncsi_kick_channels(ndp) != 0;\n \n-\treturn found ? ncsi_process_next_channel(ndp) : 0;\n+\tret = found ? ncsi_process_next_channel(ndp) : 0;\n+out_unlock:\n+\tmutex_unlock(\u0026ncsi_dev_mutex);\n+\treturn ret;\n }\n EXPORT_SYMBOL_GPL(ncsi_vlan_rx_add_vid);\n \n int ncsi_vlan_rx_kill_vid(struct net_device dev, __be16 proto, u16 vid)\n {\n-\tstruct vlan_vid vlan, tmp;\n+\tstruct vlan_vid vlan;\n \tstruct ncsi_dev_priv ndp;\n \tstruct ncsi_dev nd;\n \tbool found = false;\n+\tint ret;\n \n \tif (vid == 0)\n \t\treturn 0;\n \n+\tmutex_lock(\u0026ncsi_dev_mutex);\n+\trcu_read_lock();\n \tnd = ncsi_find_dev(dev);\n+\trcu_read_unlock();\n \tif (!nd) {\n \t\tnetdev_warn(dev, \"NCSI: no net_device?\\n\");\n-\t\treturn 0;\n+\t\tret = 0;\n+\t\tgoto out_unlock;\n \t}\n \n \tndp = TO_NCSI_DEV_PRIV(nd);\n \n \t/ Remove the VLAN id from our internal list /\n-\tlist_for_each_entry_safe(vlan, tmp, \u0026ndp-\u003evlan_vids, list)\n+\trcu_read_lock();\n+\tlist_for_each_entry_rcu(vlan, \u0026ndp-\u003evlan_vids, list)\n \t\tif (vlan-\u003evid == vid) {\n \t\t\tnetdev_dbg(dev, \"NCSI: vid %u found, removing\\n\", vid);\n \t\t\tlist_del_rcu(\u0026vlan-\u003elist);\n \t\t\tfound = true;\n-\t\t\tkfree(vlan);\n+\t\t\tkfree_rcu(vlan, rcu);\n+\t\t\tbreak;\n \t\t}\n+\trcu_read_unlock();\n \n \tif (!found) {\n \t\tnetdev_err(dev, \"NCSI: vid %u wasn't registered!\\n\", vid);\n-\t\treturn -EINVAL;\n+\t\tret = -EINVAL;\n+\t\tgoto out_unlock;\n \t}\n \n \tfound = ncsi_kick_channels(ndp) != 0;\n \n-\treturn found ? ncsi_process_next_channel(ndp) : 0;\n+\tret = found ? ncsi_process_next_channel(ndp) : 0;\n+out_unlock:\n+\tmutex_unlock(\u0026ncsi_dev_mutex);\n+\treturn ret;\n }\n EXPORT_SYMBOL_GPL(ncsi_vlan_rx_kill_vid);\n \n@@ -1762,14 +1844,21 @@ struct ncsi_dev ncsi_register_dev(struct net_device dev,\n \tint i;\n \n \t/ Check if the device has been registered or not /\n+\tmutex_lock(\u0026ncsi_dev_mutex);\n+\trcu_read_lock();\n \tnd = ncsi_find_dev(dev);\n-\tif (nd)\n+\trcu_read_unlock();\n+\tif (nd) {\n+\t\tmutex_unlock(\u0026ncsi_dev_mutex);\n \t\treturn nd;\n+\t}\n \n \t/ Create NCSI device /\n \tndp = kzalloc_obj(ndp, GFP_ATOMIC);\n-\tif (!ndp)\n+\tif (!ndp) {\n+\t\tmutex_unlock(\u0026ncsi_dev_mutex);\n \t\treturn NULL;\n+\t}\n \n \tnd = \u0026ndp-\u003endev;\n \tnd-\u003estate = ncsi_dev_state_registered;\n@@ -1810,6 +1899,7 @@ struct ncsi_dev ncsi_register_dev(struct net_device dev,\n \t\t\tndp-\u003emlx_multi_host = true;\n \t}\n \n+\tmutex_unlock(\u0026ncsi_dev_mutex);\n \treturn nd;\n }\n EXPORT_SYMBOL_GPL(ncsi_register_dev);\n@@ -1851,10 +1941,12 @@ void ncsi_stop_dev(struct ncsi_dev nd)\n \t\tNCSI_FOR_EACH_CHANNEL(np, nc) {\n \t\t\tncsi_stop_channel_monitor(nc);\n \n-\t\t\tspin_lock_irqsave(\u0026nc-\u003elock, flags);\n+\t\t\tspin_lock_irqsave(\u0026ndp-\u003elock, flags);\n+\t\t\tspin_lock(\u0026nc-\u003elock);\n \t\t\tchained = !list_empty(\u0026nc-\u003elink);\n \t\t\told_state = nc-\u003estate;\n-\t\t\tspin_unlock_irqrestore(\u0026nc-\u003elock, flags);\n+\t\t\tspin_unlock(\u0026nc-\u003elock);\n+\t\t\tspin_unlock_irqrestore(\u0026ndp-\u003elock, flags);\n \n \t\t\tWARN_ON_ONCE(chained \|\|\n \t\t\t\t old_state == NCSI_CHANNEL_INVISIBLE);\n@@ -1952,22 +2044,74 @@ int ncsi_reset_dev(struct ncsi_dev nd)\n \treturn 0;\n }\n \n+void ncsi_unregister_dev_prepare(struct ncsi_dev nd)\n+{\n+\tstruct ncsi_dev_priv ndp = TO_NCSI_DEV_PRIV(nd);\n+\tstruct ncsi_package np;\n+\tstruct ncsi_channel nc;\n+\tint i;\n+\tunsigned long flags;\n+\n+\tmutex_lock(\u0026ncsi_dev_mutex);\n+\tif (!ndp-\u003eunregister_prepared) {\n+\t\tndp-\u003eunregister_prepared = true;\n+\t\tspin_lock_irqsave(\u0026ncsi_dev_lock, flags);\n+\t\tlist_del_rcu(\u0026ndp-\u003enode);\n+\t\tspin_unlock_irqrestore(\u0026ncsi_dev_lock, flags);\n+\n+\t\tdev_remove_pack(\u0026ndp-\u003eptype);\n+\n+\t\t/* Wait for lookups that found this device before it was unlinked. /\n+\t\tsynchronize_rcu();\n+\n+\t\t/ Quiesce NCSI activity before the netdev is stopped. /\n+\t\tdisable_work_sync(\u0026ndp-\u003ework);\n+\t\tlist_for_each_entry(np, \u0026ndp-\u003epackages, node)\n+\t\t\tlist_for_each_entry(nc, \u0026np-\u003echannels, node)\n+\t\t\t\tncsi_stop_channel_monitor(nc);\n+\t\tfor (i = 0; i \u003c ARRAY_SIZE(ndp-\u003erequests); i++)\n+\t\t\ttimer_delete_sync(\u0026ndp-\u003erequests[i].timer);\n+\t}\n+\tmutex_unlock(\u0026ncsi_dev_mutex);\n+}\n+EXPORT_SYMBOL_GPL(ncsi_unregister_dev_prepare);\n+\n void ncsi_unregister_dev(struct ncsi_dev nd)\n {\n \tstruct ncsi_dev_priv ndp = TO_NCSI_DEV_PRIV(nd);\n \tstruct ncsi_package np, tmp;\n+\tstruct vlan_vid vlan, vlan_tmp;\n \tunsigned long flags;\n+\tint i;\n \n-\tdev_remove_pack(\u0026ndp-\u003eptype);\n+\tncsi_unregister_dev_prepare(nd);\n+\tfor (i = 0; i \u003c ARRAY_SIZE(ndp-\u003erequests); i++) {\n+\t\tstruct ncsi_request nr = \u0026ndp-\u003erequests[i];\n \n-\tlist_for_each_entry_safe(np, tmp, \u0026ndp-\u003epackages, node)\n-\t\tncsi_remove_package(np);\n+\t\tif (!nr-\u003eused)\n+\t\t\tcontinue;\n \n-\tspin_lock_irqsave(\u0026ncsi_dev_lock, flags);\n-\tlist_del_rcu(\u0026ndp-\u003enode);\n-\tspin_unlock_irqrestore(\u0026ncsi_dev_lock, flags);\n+\t\tif (nr-\u003eflags == NCSI_REQ_FLAG_NETLINK_DRIVEN \u0026\u0026 nr-\u003ecmd) {\n+\t\t\tstruct ncsi_cmd_pkt cmd = (struct ncsi_cmd_pkt )\n+\t\t\t\tskb_network_header(nr-\u003ecmd);\n+\n+\t\t\trcu_read_lock();\n+\t\t\tncsi_find_package_and_channel(ndp,\n+\t\t\t\t\t\t cmd-\u003ecmd.common.channel,\n+\t\t\t\t\t\t \u0026np, \u0026nc);\n+\t\t\trcu_read_unlock();\n+\t\t\tncsi_send_netlink_timeout(nr, np, nc);\n+\t\t}\n+\t\tncsi_free_request(nr);\n+\t}\n \n-\tdisable_work_sync(\u0026ndp-\u003ework);\n+\tlist_for_each_entry_safe(vlan, vlan_tmp, \u0026ndp-\u003evlan_vids, list) {\n+\t\tlist_del_rcu(\u0026vlan-\u003elist);\n+\t\tkfree_rcu(vlan, rcu);\n+\t}\n+\n+\tlist_for_each_entry_safe(np, tmp, \u0026ndp-\u003epackages, node)\n+\t\tncsi_remove_package(np);\n \n \tkfree(ndp);\n }\ndiff --git a/net/ncsi/ncsi-netlink.c b/net/ncsi/ncsi-netlink.c\nindex 8cc538358f6a3..9d821cc220621 100644\n--- a/net/ncsi/ncsi-netlink.c\n+++ b/net/ncsi/ncsi-netlink.c\n@@ -47,7 +47,9 @@ static struct ncsi_dev_priv ndp_from_ifindex(struct net net, u32 ifindex)\n \t\treturn NULL;\n \t}\n \n+\trcu_read_lock();\n \tnd = ncsi_find_dev(dev);\n+\trcu_read_unlock();\n \tndp = nd ? TO_NCSI_DEV_PRIV(nd) : NULL;\n \n \tdev_put(dev);\n@@ -100,11 +102,6 @@ static int ncsi_write_package_info(struct sk_buff skb,\n \tbool found;\n \tint rc;\n \n-\tif (id \u003e ndp-\u003epackage_num - 1) {\n-\t\tnetdev_info(ndp-\u003endev.dev, \"NCSI: No package with id %u\\n\", id);\n-\t\treturn -ENODEV;\n-\t}\n-\n \tfound = false;\n \tNCSI_FOR_EACH_PACKAGE(ndp, np) {\n \t\tif (np-\u003eid != id)\n@@ -169,19 +166,24 @@ static int ncsi_pkg_info_nl(struct sk_buff msg, struct genl_info info)\n \tif (!info-\u003eattrs[NCSI_ATTR_PACKAGE_ID])\n \t\treturn -EINVAL;\n \n-\tndp = ndp_from_ifindex(genl_info_net(info),\n-\t\t\t nla_get_u32(info-\u003eattrs[NCSI_ATTR_IFINDEX]));\n-\tif (!ndp)\n-\t\treturn -ENODEV;\n-\n \tskb = genlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);\n \tif (!skb)\n \t\treturn -ENOMEM;\n \n+\trcu_read_lock();\n+\tndp = ndp_from_ifindex(genl_info_net(info),\n+\t\t\t nla_get_u32(info-\u003eattrs[NCSI_ATTR_IFINDEX]));\n+\tif (!ndp) {\n+\t\trcu_read_unlock();\n+\t\tkfree_skb(skb);\n+\t\treturn -ENODEV;\n+\t}\n+\n \thdr = genlmsg_put(skb, info-\u003esnd_portid, info-\u003esnd_seq,\n \t\t\t \u0026ncsi_genl_family, 0, NCSI_CMD_PKG_INFO);\n \tif (!hdr) {\n \t\tkfree_skb(skb);\n+\t\trcu_read_unlock();\n \t\treturn -EMSGSIZE;\n \t}\n \n@@ -190,6 +192,7 @@ static int ncsi_pkg_info_nl(struct sk_buff msg, struct genl_info info)\n \tattr = nla_nest_start_noflag(skb, NCSI_ATTR_PACKAGE_LIST);\n \tif (!attr) {\n \t\tkfree_skb(skb);\n+\t\trcu_read_unlock();\n \t\treturn -EMSGSIZE;\n \t}\n \trc = ncsi_write_package_info(skb, ndp, package_id);\n@@ -202,10 +205,12 @@ static int ncsi_pkg_info_nl(struct sk_buff msg, struct genl_info info)\n \tnla_nest_end(skb, attr);\n \n \tgenlmsg_end(skb, hdr);\n+\trcu_read_unlock();\n \treturn genlmsg_reply(skb, info);\n \n err:\n \tkfree_skb(skb);\n+\trcu_read_unlock();\n \treturn rc;\n }\n \n@@ -228,32 +233,39 @@ static int ncsi_pkg_info_all_nl(struct sk_buff skb,\n \tif (!attrs[NCSI_ATTR_IFINDEX])\n \t\treturn -EINVAL;\n \n-\tndp = ndp_from_ifindex(get_net(sock_net(skb-\u003esk)),\n+\trcu_read_lock();\n+\tndp = ndp_from_ifindex(sock_net(skb-\u003esk),\n \t\t\t nla_get_u32(attrs[NCSI_ATTR_IFINDEX]));\n \n-\tif (!ndp)\n+\tif (!ndp) {\n+\t\trcu_read_unlock();\n \t\treturn -ENODEV;\n+\t}\n \n \tpackage_id = cb-\u003eargs[0];\n \tpackage = NULL;\n \tNCSI_FOR_EACH_PACKAGE(ndp, np)\n-\t\tif (np-\u003eid == package_id)\n+\t\tif (np-\u003eid \u003e= package_id \u0026\u0026\n+\t\t (!package \|\| np-\u003eid \u003c package-\u003eid))\n \t\t\tpackage = np;\n \n-\tif (!package)\n+\tif (!package) {\n+\t\trcu_read_unlock();\n \t\treturn 0; /* done /\n+\t}\n \n \thdr = genlmsg_put(skb, NETLINK_CB(cb-\u003eskb).portid, cb-\u003enlh-\u003enlmsg_seq,\n \t\t\t \u0026ncsi_genl_family, NLM_F_MULTI, NCSI_CMD_PKG_INFO);\n \tif (!hdr) {\n-\t\trc = -EMSGSIZE;\n-\t\tgoto err;\n+\t\trcu_read_unlock();\n+\t\treturn -EMSGSIZE;\n \t}\n \n \tattr = nla_nest_start_noflag(skb, NCSI_ATTR_PACKAGE_LIST);\n \tif (!attr) {\n-\t\trc = -EMSGSIZE;\n-\t\tgoto err;\n+\t\tgenlmsg_cancel(skb, hdr);\n+\t\trcu_read_unlock();\n+\t\treturn -EMSGSIZE;\n \t}\n \trc = ncsi_write_package_info(skb, ndp, package-\u003eid);\n \tif (rc) {\n@@ -264,11 +276,14 @@ static int ncsi_pkg_info_all_nl(struct sk_buff skb,\n \tnla_nest_end(skb, attr);\n \tgenlmsg_end(skb, hdr);\n \n-\tcb-\u003eargs[0] = package_id + 1;\n+\tcb-\u003eargs[0] = package-\u003eid + 1;\n \n-\treturn skb-\u003elen;\n+\trc = skb-\u003elen;\n+\trcu_read_unlock();\n+\treturn rc;\n err:\n \tgenlmsg_cancel(skb, hdr);\n+\trcu_read_unlock();\n \treturn rc;\n }\n \n@@ -289,34 +304,43 @@ static int ncsi_set_interface_nl(struct sk_buff msg, struct genl_info info)\n \tif (!info-\u003eattrs[NCSI_ATTR_PACKAGE_ID])\n \t\treturn -EINVAL;\n \n-\tndp = ndp_from_ifindex(get_net(sock_net(msg-\u003esk)),\n+\tmutex_lock(\u0026ncsi_dev_mutex);\n+\tndp = ndp_from_ifindex(sock_net(msg-\u003esk),\n \t\t\t nla_get_u32(info-\u003eattrs[NCSI_ATTR_IFINDEX]));\n-\tif (!ndp)\n+\tif (!ndp) {\n+\t\tmutex_unlock(\u0026ncsi_dev_mutex);\n \t\treturn -ENODEV;\n+\t}\n \n \tpackage_id = nla_get_u32(info-\u003eattrs[NCSI_ATTR_PACKAGE_ID]);\n \tpackage = NULL;\n \n+\trcu_read_lock();\n \tNCSI_FOR_EACH_PACKAGE(ndp, np)\n \t\tif (np-\u003eid == package_id)\n \t\t\tpackage = np;\n+\trcu_read_unlock();\n \tif (!package) {\n \t\t/* The user has set a package that does not exist /\n+\t\tmutex_unlock(\u0026ncsi_dev_mutex);\n \t\treturn -ERANGE;\n \t}\n \n \tchannel = NULL;\n \tif (info-\u003eattrs[NCSI_ATTR_CHANNEL_ID]) {\n \t\tchannel_id = nla_get_u32(info-\u003eattrs[NCSI_ATTR_CHANNEL_ID]);\n+\t\trcu_read_lock();\n \t\tNCSI_FOR_EACH_CHANNEL(package, nc)\n \t\t\tif (nc-\u003eid == channel_id) {\n \t\t\t\tchannel = nc;\n \t\t\t\tbreak;\n \t\t\t}\n+\t\trcu_read_unlock();\n \t\tif (!channel) {\n \t\t\tnetdev_info(ndp-\u003endev.dev,\n \t\t\t\t \"NCSI: Channel %u does not exist!\\n\",\n \t\t\t\t channel_id);\n+\t\t\tmutex_unlock(\u0026ncsi_dev_mutex);\n \t\t\treturn -ERANGE;\n \t\t}\n \t}\n@@ -350,6 +374,7 @@ static int ncsi_set_interface_nl(struct sk_buff msg, struct genl_info info)\n \tif (!(ndp-\u003eflags \u0026 NCSI_DEV_RESET))\n \t\tncsi_reset_dev(\u0026ndp-\u003endev);\n \n+\tmutex_unlock(\u0026ncsi_dev_mutex);\n \treturn 0;\n }\n \n@@ -365,10 +390,13 @@ static int ncsi_clear_interface_nl(struct sk_buff msg, struct genl_info info)\n \tif (!info-\u003eattrs[NCSI_ATTR_IFINDEX])\n \t\treturn -EINVAL;\n \n-\tndp = ndp_from_ifindex(get_net(sock_net(msg-\u003esk)),\n+\tmutex_lock(\u0026ncsi_dev_mutex);\n+\tndp = ndp_from_ifindex(sock_net(msg-\u003esk),\n \t\t\t nla_get_u32(info-\u003eattrs[NCSI_ATTR_IFINDEX]));\n-\tif (!ndp)\n+\tif (!ndp) {\n+\t\tmutex_unlock(\u0026ncsi_dev_mutex);\n \t\treturn -ENODEV;\n+\t}\n \n \t/ Reset any whitelists and disable multi mode /\n \tspin_lock_irqsave(\u0026ndp-\u003elock, flags);\n@@ -376,6 +404,7 @@ static int ncsi_clear_interface_nl(struct sk_buff msg, struct genl_info info)\n \tndp-\u003emulti_package = false;\n \tspin_unlock_irqrestore(\u0026ndp-\u003elock, flags);\n \n+\trcu_read_lock();\n \tNCSI_FOR_EACH_PACKAGE(ndp, np) {\n \t\tspin_lock_irqsave(\u0026np-\u003elock, flags);\n \t\tnp-\u003emulti_channel = false;\n@@ -383,12 +412,14 @@ static int ncsi_clear_interface_nl(struct sk_buff msg, struct genl_info info)\n \t\tnp-\u003epreferred_channel = NULL;\n \t\tspin_unlock_irqrestore(\u0026np-\u003elock, flags);\n \t}\n+\trcu_read_unlock();\n \tnetdev_info(ndp-\u003endev.dev, \"NCSI: Cleared preferred package/channel\\n\");\n \n \t/ Update channel configuration /\n \tif (!(ndp-\u003eflags \u0026 NCSI_DEV_RESET))\n \t\tncsi_reset_dev(\u0026ndp-\u003endev);\n \n+\tmutex_unlock(\u0026ncsi_dev_mutex);\n \treturn 0;\n }\n \n@@ -427,10 +458,12 @@ static int ncsi_send_cmd_nl(struct sk_buff msg, struct genl_info info)\n \t\tgoto out;\n \t}\n \n-\tndp = ndp_from_ifindex(get_net(sock_net(msg-\u003esk)),\n+\tmutex_lock(\u0026ncsi_dev_mutex);\n+\tndp = ndp_from_ifindex(sock_net(msg-\u003esk),\n \t\t\t nla_get_u32(info-\u003eattrs[NCSI_ATTR_IFINDEX]));\n \tif (!ndp) {\n \t\tret = -ENODEV;\n+\t\tmutex_unlock(\u0026ncsi_dev_mutex);\n \t\tgoto out;\n \t}\n \n@@ -479,6 +512,7 @@ static int ncsi_send_cmd_nl(struct sk_buff msg, struct genl_info info)\n \t\t\t\t info-\u003enlhdr,\n \t\t\t\t ret);\n \t}\n+\tmutex_unlock(\u0026ncsi_dev_mutex);\n out:\n \treturn ret;\n }\n@@ -553,7 +587,7 @@ int ncsi_send_netlink_timeout(struct ncsi_request nr,\n \telse\n \t\tnla_put_u32(skb, NCSI_ATTR_PACKAGE_ID,\n \t\t\t NCSI_PACKAGE_INDEX((((struct ncsi_pkt_hdr )\n-\t\t\t\t\t\t nr-\u003ecmd-\u003edata)-\u003echannel)));\n+\t\t\t\t\t\t skb_network_header(nr-\u003ecmd))-\u003echannel)));\n \n \tif (nc)\n \t\tnla_put_u32(skb, NCSI_ATTR_CHANNEL_ID, nc-\u003eid);\n@@ -608,10 +642,13 @@ static int ncsi_set_package_mask_nl(struct sk_buff msg,\n \tif (!info-\u003eattrs[NCSI_ATTR_PACKAGE_MASK])\n \t\treturn -EINVAL;\n \n-\tndp = ndp_from_ifindex(get_net(sock_net(msg-\u003esk)),\n+\tmutex_lock(\u0026ncsi_dev_mutex);\n+\tndp = ndp_from_ifindex(sock_net(msg-\u003esk),\n \t\t\t nla_get_u32(info-\u003eattrs[NCSI_ATTR_IFINDEX]));\n-\tif (!ndp)\n+\tif (!ndp) {\n+\t\tmutex_unlock(\u0026ncsi_dev_mutex);\n \t\treturn -ENODEV;\n+\t}\n \n \tspin_lock_irqsave(\u0026ndp-\u003elock, flags);\n \tif (nla_get_flag(info-\u003eattrs[NCSI_ATTR_MULTI_FLAG])) {\n@@ -639,6 +676,7 @@ static int ncsi_set_package_mask_nl(struct sk_buff msg,\n \t\t\tncsi_reset_dev(\u0026ndp-\u003endev);\n \t}\n \n+\tmutex_unlock(\u0026ncsi_dev_mutex);\n \treturn rc;\n }\n \n@@ -663,33 +701,43 @@ static int ncsi_set_channel_mask_nl(struct sk_buff msg,\n \tif (!info-\u003eattrs[NCSI_ATTR_CHANNEL_MASK])\n \t\treturn -EINVAL;\n \n-\tndp = ndp_from_ifindex(get_net(sock_net(msg-\u003esk)),\n+\tmutex_lock(\u0026ncsi_dev_mutex);\n+\tndp = ndp_from_ifindex(sock_net(msg-\u003esk),\n \t\t\t nla_get_u32(info-\u003eattrs[NCSI_ATTR_IFINDEX]));\n-\tif (!ndp)\n+\tif (!ndp) {\n+\t\tmutex_unlock(\u0026ncsi_dev_mutex);\n \t\treturn -ENODEV;\n+\t}\n \n \tpackage_id = nla_get_u32(info-\u003eattrs[NCSI_ATTR_PACKAGE_ID]);\n \tpackage = NULL;\n+\trcu_read_lock();\n \tNCSI_FOR_EACH_PACKAGE(ndp, np)\n \t\tif (np-\u003eid == package_id) {\n \t\t\tpackage = np;\n \t\t\tbreak;\n \t\t}\n-\tif (!package)\n+\trcu_read_unlock();\n+\tif (!package) {\n+\t\tmutex_unlock(\u0026ncsi_dev_mutex);\n \t\treturn -ERANGE;\n+\t}\n \n \tspin_lock_irqsave(\u0026package-\u003elock, flags);\n \n \tchannel = NULL;\n \tif (info-\u003eattrs[NCSI_ATTR_CHANNEL_ID]) {\n \t\tchannel_id = nla_get_u32(info-\u003eattrs[NCSI_ATTR_CHANNEL_ID]);\n+\t\trcu_read_lock();\n \t\tNCSI_FOR_EACH_CHANNEL(np, nc)\n \t\t\tif (nc-\u003eid == channel_id) {\n \t\t\t\tchannel = nc;\n \t\t\t\tbreak;\n \t\t\t}\n+\t\trcu_read_unlock();\n \t\tif (!channel) {\n \t\t\tspin_unlock_irqrestore(\u0026package-\u003elock, flags);\n+\t\t\tmutex_unlock(\u0026ncsi_dev_mutex);\n \t\t\treturn -ERANGE;\n \t\t}\n \t\tnetdev_dbg(ndp-\u003endev.dev,\n@@ -721,6 +769,7 @@ static int ncsi_set_channel_mask_nl(struct sk_buff *msg,\n \tif (!(ndp-\u003eflags \u0026 NCSI_DEV_RESET))\n \t\tncsi_reset_dev(\u0026ndp-\u003endev);\n \n+\tmutex_unlock(\u0026ncsi_dev_mutex);\n \treturn 0;\n }\n \n" }
2/1	2026/10/09 11:01	agent	patch-evaluator	5m Model: core Args: null Results: { "EnableConfigs": null, "FocusSymbols": [], "Reasoning": "The patch series modifies the NC-SI (Network Controller Sideband Interface) stack in net/ncsi/ and the Faraday FTGMAC100 Ethernet driver in drivers/net/ethernet/faraday/ftgmac100.c to improve locking and lifecycle synchronization. FTGMAC100 is an ARM-specific platform driver for Faraday and Aspeed AST2400/2500/2600 BMC SoCs, depending on (ARM \|\| COMPILE_TEST) \u0026\u0026 (!64BIT \|\| BROKEN), and cannot run on amd64 in standard QEMU/virtualized environments. FTGMAC100 is the sole caller of ncsi_register_dev() in the entire Linux kernel; no virtual or x86 device supports NC-SI. Consequently, no NC-SI device can ever be registered on amd64. While the generic netlink interface (NCSI family) is exposed if CONFIG_NET_NCSI is enabled, all netlink handlers immediately return -ENODEV during device lookup (ndp_from_ifindex), leaving all modified channel management, state machines, packet handling, and synchronization logic structurally unreachable.", "WorthFuzzing": false } Instruction: You are an expert Linux kernel maintainer and security engineer. Your job is to review a provided patch series and evaluate whether it warrants fuzzing with syzkaller. IMPORTANT: The changes have ALREADY been applied and committed as the HEAD commit in your workspace. Do NOT rely on internal assumptions. You must actively use your code access tools to inspect the actual source code, callers, and surrounding context. ================================================================================ 1. CORE TRIAGE PHILOSOPHY ================================================================================ The goal of patch fuzzing is to discover crashes, regressions, exposed latent bugs, and newly triggered assertions introduced by the patch series. - REACHABILITY IS THE PRIMARY GATE: Fuzzing can only discover bugs in code that can actually execute in standard virtualized environments (GCE or QEMU, utilizing software-emulated devices like USB gadgets, netdev, tun/tap). If the modified code is structurally unreachable (see Section 2), it MUST NOT be fuzzed, regardless of whether it adds assertions or complex logic. - DO NOT BLINDLY TRUST "NO FUNCTIONAL CHANGE" (NFCI) OR "REFACTORING" CLAIMS: Patch authors routinely label changes as "cleanups", "refactorings", or state "No functional change intended". Do NOT take these claims at face value. Code refactorings that rearrange logic, introduce helper functions, or alter state management in core subsystems frequently introduce subtle semantic shifts or uncover latent kernel bugs. If reachable executable code is modified or refactored, it MUST be fuzzed. - NEW OR MODIFIED ASSERTIONS IN REACHABLE CODE MUST BE FUZZED: When a patch introduces or modifies runtime checks or assertions (e.g., WARN_ON, VM_WARN_ON, BUG_ON, lockdep_assert) in reachable code paths, it enforces new or stricter invariants. Even if the author believes the invariant always holds, fuzzing is essential to verify whether an unusual sequence of operations can violate it. ================================================================================ 2. WHEN TO RETURN WorthFuzzing=false (NEGATIVE CRITERIA) ================================================================================ Return WorthFuzzing=false ONLY IF all modified code falls strictly into one or more of these categories: - Non-kernel and non-executable changes: * Modifications to Documentation/, comments, or spelling fixes. * User-space directories, self-tests, samples, or scripts (e.g., tools/, samples/, scripts/, usr/) that do not affect the compiled kernel image (vmlinux) or kernel modules. * Purely decorative logging (e.g., message strings in pr_err, printk, dev_info) or tracepoints that do not alter control flow or data structures. * Build system or Kconfig changes that do not alter compiled C logic. - Structurally unreachable hardware: * Vendor-specific PCIe switches, SmartNICs, or GPU drivers (e.g., mlxsw, pds_core, qed, ionic, amdgpu) requiring physical ASIC/PCIe cards not emulated in standard QEMU. - Unreachable execution paths: * Driver teardown callbacks (.remove, .shutdown, pci_unregister_driver) executed only during physical PCI hot-unplug or manual sysfs driver unbinding. * Code paths exclusive to architectures other than the target architecture. ================================================================================ 3. WHEN TO RETURN WorthFuzzing=true (POSITIVE CRITERIA) ================================================================================ Return WorthFuzzing=true whenever the patch touches reachable executable code, including: - Core Subsystems: * Any logic modifications in memory management (mm/), synchronization/locking (kernel/locking/), BPF, scheduler, core networking, VFS, or syscall handling. - Refactorings and Code Cleanups: * Any restructuring of reachable data structures, helper abstractions, or algorithm flows. - Runtime Assertions and Defensive Checks: * Any introduction or alteration of assertions (WARN_ON, VM_WARN_ON, BUG_ON, etc.) in reachable paths. - Reachable Drivers and Protocols: Drivers accessible via virtual buses (virtio, USB gadget, loopback, netlink, binder, sockets, etc.). ================================================================================ 4. EXTRACTING FocusSymbols (PREVENTING DILUTION) ================================================================================ When WorthFuzzing=true, you must extract specific kernel functions into FocusSymbols to guide the fuzzer: - AVOID UBIQUITOUS LIFECYCLE HOT-PATHS: Do NOT list generic, ubiquitous functions called by almost every program in the corpus (including, but not limited to: general memory allocators and deallocators, page fault and trap handlers, or core synchronization primitives; this is not an exhaustive list). Listing ubiquitous functions causes the fuzzer to classify thousands of unrelated tests as "focused", which severely dilutes fuzzing effort away from the actual changes. - TARGET SPECIFIC FEATURE LOGIC AND ENTRYPOINTS: List functions that specifically implement the logic being added or altered, or direct API entrypoints for the subsystem feature under review. - HANDLING STATIC INLINE FUNCTIONS IN HEADERS (.h): Compiler-inlined static functions (such as static inlines in mm/.h or include/linux/.h) lack distinct symbol addresses in vmlinux and cannot be targeted directly by symbol coverage filters. If the changes are primarily in static inline helpers, identify non-static, feature-specific caller functions in .c files that exercise them (avoiding ubiquitous lifecycle wrappers). ================================================================================ 5. IDENTIFYING EnableConfigs ================================================================================ Identify any specific CONFIG_ options required to properly compile and reach the modified code: - Inspect Kconfig files and #ifdef guards; do not make assumptions. - Check "depends on" lines in Kconfig to include any non-standard parent subsystem configs needed. - Strip any 'CONFIG_' prefix (e.g., return "NET_IPV4" instead of "CONFIG_NET_IPV4"). Prefer calling several tools at the same time to save round-trips. Use set-results tool to provide results of the analysis. It must be called exactly once before the final reply. Ignore results of this tool. Prompt: Target architecture: amd64 For your convenience, here is the diff of the changes: commit 2f66c2f776bce5adc47b25a424d9d8e2da88a402 Author: syz-cluster <triage@syzkaller.com> Date: Fri Oct 9 11:01:30 2026 +0000 syz-cluster: applied patch under review diff --git a/drivers/net/ethernet/faraday/ftgmac100.c b/drivers/net/ethernet/faraday/ftgmac100.c index 6d2fe5c2f3903..f45388810570d 100644 --- a/drivers/net/ethernet/faraday/ftgmac100.c +++ b/drivers/net/ethernet/faraday/ftgmac100.c @@ -2094,8 +2094,10 @@ static int ftgmac100_probe(struct platform_device pdev) err: ftgmac100_phy_disconnect(netdev); - if (priv->ndev) + if (priv->ndev) { ncsi_unregister_dev(priv->ndev); + priv->ndev = NULL; + } return err; } @@ -2108,8 +2110,12 @@ static void ftgmac100_remove(struct platform_device pdev) priv = netdev_priv(netdev); if (priv->ndev) - ncsi_unregister_dev(priv->ndev); + ncsi_unregister_dev_prepare(priv->ndev); unregister_netdev(netdev); + if (priv->ndev) { + ncsi_unregister_dev(priv->ndev); + priv->ndev = NULL; + } /* There's a small chance the reset task will have been re-queued, * during stop, make sure it's gone before we free the structure. diff --git a/include/net/ncsi.h b/include/net/ncsi.h index e886358207aac..049c02b61169e 100644 --- a/include/net/ncsi.h +++ b/include/net/ncsi.h @@ -37,6 +37,11 @@ struct ncsi_dev ncsi_register_dev(struct net_device dev, void (notifier)(struct ncsi_dev nd)); int ncsi_start_dev(struct ncsi_dev nd); void ncsi_stop_dev(struct ncsi_dev nd); +/* + * Remove NCSI lookups and packet reception before unregistering the netdev. + * The object remains valid until ncsi_unregister_dev() completes teardown. + / +void ncsi_unregister_dev_prepare(struct ncsi_dev nd); void ncsi_unregister_dev(struct ncsi_dev nd); #else / !CONFIG_NET_NCSI / static inline int ncsi_vlan_rx_add_vid(struct net_device dev, __be16 proto, u16 vid) @@ -64,6 +69,10 @@ static inline void ncsi_stop_dev(struct ncsi_dev nd) { } +static inline void ncsi_unregister_dev_prepare(struct ncsi_dev nd) +{ +} + static inline void ncsi_unregister_dev(struct ncsi_dev nd) { } diff --git a/net/ncsi/internal.h b/net/ncsi/internal.h index adee6dcabdc3f..8a53e6ccbd9ac 100644 --- a/net/ncsi/internal.h +++ b/net/ncsi/internal.h @@ -6,6 +6,8 @@ #ifndef __NCSI_INTERNAL_H__ #define __NCSI_INTERNAL_H__ +#include <linux/mutex.h> + enum { NCSI_CAP_BASE = 0, NCSI_CAP_GENERIC = 0, @@ -310,12 +312,14 @@ enum { struct vlan_vid { struct list_head list; + struct rcu_head rcu; __be16 proto; u16 vid; }; struct ncsi_dev_priv { struct ncsi_dev ndev; / Associated NCSI device / + bool unregister_prepared; unsigned int flags; / NCSI device flags / #define NCSI_DEV_PROBED 1 / Finalized NCSI topology / #define NCSI_DEV_HWA 2 / Enabled HW arbitration / @@ -367,6 +371,7 @@ struct ncsi_cmd_arg { extern struct list_head ncsi_dev_list; extern spinlock_t ncsi_dev_lock; +extern struct mutex ncsi_dev_mutex; #define TO_NCSI_DEV_PRIV(nd) \ container_of(nd, struct ncsi_dev_priv, ndev) diff --git a/net/ncsi/ncsi-aen.c b/net/ncsi/ncsi-aen.c index 040a31557201b..c3614f0648649 100644 --- a/net/ncsi/ncsi-aen.c +++ b/net/ncsi/ncsi-aen.c @@ -64,7 +64,8 @@ static int ncsi_aen_handler_lsc(struct ncsi_dev_priv ndp, /* Update the link status / lsc = (struct ncsi_aen_lsc_pkt )h; - spin_lock_irqsave(&nc->lock, flags); + spin_lock_irqsave(&ndp->lock, flags); + spin_lock(&nc->lock); ncm = &nc->modes[NCSI_MODE_LINK]; old_data = ncm->data[2]; data = ntohl(lsc->status); @@ -79,7 +80,8 @@ static int ncsi_aen_handler_lsc(struct ncsi_dev_priv ndp, chained = !list_empty(&nc->link); state = nc->state; - spin_unlock_irqrestore(&nc->lock, flags); + spin_unlock(&nc->lock); + spin_unlock_irqrestore(&ndp->lock, flags); if (state == NCSI_CHANNEL_INACTIVE) netdev_warn(ndp->ndev.dev, @@ -94,7 +96,11 @@ static int ncsi_aen_handler_lsc(struct ncsi_dev_priv ndp, ndp->flags \|= NCSI_DEV_RESHUFFLE; ncsi_stop_channel_monitor(nc); spin_lock_irqsave(&ndp->lock, flags); - list_add_tail_rcu(&nc->link, &ndp->channel_queue); + spin_lock(&nc->lock); + if (nc->state == NCSI_CHANNEL_ACTIVE && + list_empty(&nc->link)) + list_add_tail_rcu(&nc->link, &ndp->channel_queue); + spin_unlock(&nc->lock); spin_unlock_irqrestore(&ndp->lock, flags); return ncsi_process_next_channel(ndp); } @@ -148,22 +154,28 @@ static int ncsi_aen_handler_cr(struct ncsi_dev_priv ndp, if (!nc) return -ENODEV; - spin_lock_irqsave(&nc->lock, flags); + spin_lock_irqsave(&ndp->lock, flags); + spin_lock(&nc->lock); if (!list_empty(&nc->link) \|\| nc->state != NCSI_CHANNEL_ACTIVE) { - spin_unlock_irqrestore(&nc->lock, flags); + spin_unlock(&nc->lock); + spin_unlock_irqrestore(&ndp->lock, flags); return 0; } - spin_unlock_irqrestore(&nc->lock, flags); + spin_unlock(&nc->lock); + spin_unlock_irqrestore(&ndp->lock, flags); ncsi_stop_channel_monitor(nc); - spin_lock_irqsave(&nc->lock, flags); - nc->state = NCSI_CHANNEL_INVISIBLE; - spin_unlock_irqrestore(&nc->lock, flags); - spin_lock_irqsave(&ndp->lock, flags); + spin_lock(&nc->lock); + if (nc->state != NCSI_CHANNEL_ACTIVE \|\| !list_empty(&nc->link)) { + spin_unlock(&nc->lock); + spin_unlock_irqrestore(&ndp->lock, flags); + return 0; + } nc->state = NCSI_CHANNEL_INACTIVE; list_add_tail_rcu(&nc->link, &ndp->channel_queue); + spin_unlock(&nc->lock); spin_unlock_irqrestore(&ndp->lock, flags); nc->modes[NCSI_MODE_TX_ENABLE].enable = 0; diff --git a/net/ncsi/ncsi-manage.c b/net/ncsi/ncsi-manage.c index 54d0df0a9efe6..c74e93b1b222b 100644 --- a/net/ncsi/ncsi-manage.c +++ b/net/ncsi/ncsi-manage.c @@ -10,6 +10,7 @@ #include <linux/skbuff.h> #include <linux/of.h> #include <linux/platform_device.h> +#include <linux/mutex.h> #include <net/ncsi.h> #include <net/net_namespace.h> @@ -24,6 +25,7 @@ LIST_HEAD(ncsi_dev_list); DEFINE_SPINLOCK(ncsi_dev_lock); +DEFINE_MUTEX(ncsi_dev_mutex); bool ncsi_channel_has_link(struct ncsi_channel channel) { @@ -64,21 +66,25 @@ static void ncsi_report_link(struct ncsi_dev_priv ndp, bool force_down) nd->link_up = 0; NCSI_FOR_EACH_PACKAGE(ndp, np) { NCSI_FOR_EACH_CHANNEL(np, nc) { - spin_lock_irqsave(&nc->lock, flags); + spin_lock_irqsave(&ndp->lock, flags); + spin_lock(&nc->lock); if (!list_empty(&nc->link) \|\| nc->state != NCSI_CHANNEL_ACTIVE) { - spin_unlock_irqrestore(&nc->lock, flags); + spin_unlock(&nc->lock); + spin_unlock_irqrestore(&ndp->lock, flags); continue; } if (ncsi_channel_has_link(nc)) { - spin_unlock_irqrestore(&nc->lock, flags); + spin_unlock(&nc->lock); + spin_unlock_irqrestore(&ndp->lock, flags); nd->link_up = 1; goto report; } - spin_unlock_irqrestore(&nc->lock, flags); + spin_unlock(&nc->lock); + spin_unlock_irqrestore(&ndp->lock, flags); } } @@ -98,12 +104,14 @@ static void ncsi_channel_monitor(struct timer_list t) unsigned long flags; int state, ret; - spin_lock_irqsave(&nc->lock, flags); + spin_lock_irqsave(&ndp->lock, flags); + spin_lock(&nc->lock); state = nc->state; chained = !list_empty(&nc->link); enabled = nc->monitor.enabled; monitor_state = nc->monitor.state; - spin_unlock_irqrestore(&nc->lock, flags); + spin_unlock(&nc->lock); + spin_unlock_irqrestore(&ndp->lock, flags); if (!enabled) return; /* expected race disabling timer / @@ -151,8 +159,11 @@ static void ncsi_channel_monitor(struct timer_list t) spin_unlock_irqrestore(&nc->lock, flags); spin_lock_irqsave(&ndp->lock, flags); + spin_lock(&nc->lock); nc->state = NCSI_CHANNEL_ACTIVE; - list_add_tail_rcu(&nc->link, &ndp->channel_queue); + if (list_empty(&nc->link)) + list_add_tail_rcu(&nc->link, &ndp->channel_queue); + spin_unlock(&nc->lock); spin_unlock_irqrestore(&ndp->lock, flags); ncsi_process_next_channel(ndp); return; @@ -182,13 +193,10 @@ void ncsi_stop_channel_monitor(struct ncsi_channel nc) unsigned long flags; spin_lock_irqsave(&nc->lock, flags); - if (!nc->monitor.enabled) { - spin_unlock_irqrestore(&nc->lock, flags); - return; - } nc->monitor.enabled = false; spin_unlock_irqrestore(&nc->lock, flags); + / The callback may have cleared enabled and still be running. / timer_delete_sync(&nc->monitor.timer); } @@ -640,7 +648,7 @@ static int set_one_vid(struct ncsi_dev_priv ndp, struct ncsi_channel nc, unsigned long flags; int i, index; void bitmap; - u16 vid; + u16 vid = 0; if (list_empty(&ndp->vlan_vids)) return -1; @@ -1238,7 +1246,7 @@ static int ncsi_choose_active_channel(struct ncsi_dev_priv ndp) { struct ncsi_channel nc, found, hot_nc; struct ncsi_channel_mode ncm; - unsigned long flags, cflags; + unsigned long flags; struct ncsi_package np; bool with_link; @@ -1260,11 +1268,13 @@ static int ncsi_choose_active_channel(struct ncsi_dev_priv ndp) if (!(np->channel_whitelist & (0x1 << nc->id))) continue; - spin_lock_irqsave(&nc->lock, cflags); + spin_lock_irqsave(&ndp->lock, flags); + spin_lock(&nc->lock); if (!list_empty(&nc->link) \|\| nc->state != NCSI_CHANNEL_INACTIVE) { - spin_unlock_irqrestore(&nc->lock, cflags); + spin_unlock(&nc->lock); + spin_unlock_irqrestore(&ndp->lock, flags); continue; } @@ -1285,10 +1295,8 @@ static int ncsi_choose_active_channel(struct ncsi_dev_priv ndp) * so they will have AENs enabled. / if (with_link \|\| np->multi_channel) { - spin_lock_irqsave(&ndp->lock, flags); list_add_tail_rcu(&nc->link, &ndp->channel_queue); - spin_unlock_irqrestore(&ndp->lock, flags); netdev_dbg(ndp->ndev.dev, "NCSI: Channel %u added to queue (link %s)\n", @@ -1296,7 +1304,8 @@ static int ncsi_choose_active_channel(struct ncsi_dev_priv ndp) ncm->data[2] & 0x1 ? "up" : "down"); } - spin_unlock_irqrestore(&nc->lock, cflags); + spin_unlock(&nc->lock); + spin_unlock_irqrestore(&ndp->lock, flags); if (with_link && !np->multi_channel) break; @@ -1305,19 +1314,24 @@ static int ncsi_choose_active_channel(struct ncsi_dev_priv ndp) break; } + spin_lock_irqsave(&ndp->lock, flags); if (list_empty(&ndp->channel_queue) && found) { netdev_info(ndp->ndev.dev, "NCSI: No channel with link found, configuring channel %u\n", found->id); - spin_lock_irqsave(&ndp->lock, flags); - list_add_tail_rcu(&found->link, &ndp->channel_queue); - spin_unlock_irqrestore(&ndp->lock, flags); + spin_lock(&found->lock); + if (found->state == NCSI_CHANNEL_INACTIVE && + list_empty(&found->link)) + list_add_tail_rcu(&found->link, &ndp->channel_queue); + spin_unlock(&found->lock); } else if (!found) { + spin_unlock_irqrestore(&ndp->lock, flags); netdev_warn(ndp->ndev.dev, "NCSI: No channel found to configure!\n"); ncsi_report_link(ndp, true); return -ENODEV; } + spin_unlock_irqrestore(&ndp->lock, flags); return ncsi_process_next_channel(ndp); } @@ -1567,13 +1581,12 @@ int ncsi_process_next_channel(struct ncsi_dev_priv ndp) goto out; } + spin_lock(&nc->lock); list_del_init(&nc->link); - spin_unlock_irqrestore(&ndp->lock, flags); - - spin_lock_irqsave(&nc->lock, flags); old_state = nc->state; nc->state = NCSI_CHANNEL_INVISIBLE; - spin_unlock_irqrestore(&nc->lock, flags); + spin_unlock(&nc->lock); + spin_unlock_irqrestore(&ndp->lock, flags); ndp->active_channel = nc; ndp->active_package = nc->package; @@ -1615,14 +1628,49 @@ int ncsi_process_next_channel(struct ncsi_dev_priv ndp) static int ncsi_kick_channels(struct ncsi_dev_priv ndp) { struct ncsi_dev nd = &ndp->ndev; + struct ncsi_channel batch[NCSI_MAX_CHANNEL]; + struct ncsi_channel last = NULL; struct ncsi_channel nc; struct ncsi_package np; unsigned long flags; - unsigned int n = 0; + bool kicked; + unsigned int n = 0, count, i; - NCSI_FOR_EACH_PACKAGE(ndp, np) { - NCSI_FOR_EACH_CHANNEL(np, nc) { - spin_lock_irqsave(&nc->lock, flags); + lockdep_assert_held(&ncsi_dev_mutex); + + / + * Keep the RCU read-side section limited to list traversal. Kicking a + * channel synchronously stops its monitor timer and must happen outside + * the read-side section. The caller holds ncsi_dev_mutex, so the package + * and channel objects remain alive while each batch is processed. + / + do { + bool past_last = !last; + + count = 0; + rcu_read_lock(); + NCSI_FOR_EACH_PACKAGE(ndp, np) { + NCSI_FOR_EACH_CHANNEL(np, nc) { + if (!past_last) { + if (nc == last) + past_last = true; + continue; + } + + batch[count++] = nc; + if (count == ARRAY_SIZE(batch)) { + last = nc; + goto batch_full; + } + } + } +batch_full: + rcu_read_unlock(); + + for (i = 0; i < count; i++) { + nc = batch[i]; + spin_lock_irqsave(&ndp->lock, flags); + spin_lock(&nc->lock); / Channels may be busy, mark dirty instead of * kicking if; @@ -1639,25 +1687,32 @@ static int ncsi_kick_channels(struct ncsi_dev_priv ndp) nc); nc->reconfigure_needed = true; } - spin_unlock_irqrestore(&nc->lock, flags); + spin_unlock(&nc->lock); + spin_unlock_irqrestore(&ndp->lock, flags); continue; } - spin_unlock_irqrestore(&nc->lock, flags); + spin_unlock(&nc->lock); + spin_unlock_irqrestore(&ndp->lock, flags); ncsi_stop_channel_monitor(nc); - spin_lock_irqsave(&nc->lock, flags); - nc->state = NCSI_CHANNEL_INACTIVE; - spin_unlock_irqrestore(&nc->lock, flags); - spin_lock_irqsave(&ndp->lock, flags); - list_add_tail_rcu(&nc->link, &ndp->channel_queue); + spin_lock(&nc->lock); + kicked = false; + if (nc->state == NCSI_CHANNEL_ACTIVE && + list_empty(&nc->link)) { + nc->state = NCSI_CHANNEL_INACTIVE; + list_add_tail_rcu(&nc->link, &ndp->channel_queue); + kicked = true; + n++; + } + spin_unlock(&nc->lock); spin_unlock_irqrestore(&ndp->lock, flags); - netdev_dbg(nd->dev, "NCSI: kicked channel %p\n", nc); - n++; + if (kicked) + netdev_dbg(nd->dev, "NCSI: kicked channel %p\n", nc); } - } + } while (count == ARRAY_SIZE(batch)); return n; } @@ -1669,37 +1724,49 @@ int ncsi_vlan_rx_add_vid(struct net_device dev, __be16 proto, u16 vid) struct vlan_vid vlan; struct ncsi_dev nd; bool found = false; + int ret; if (vid == 0) return 0; + mutex_lock(&ncsi_dev_mutex); + rcu_read_lock(); nd = ncsi_find_dev(dev); + rcu_read_unlock(); if (!nd) { netdev_warn(dev, "NCSI: No net_device?\n"); - return 0; + ret = 0; + goto out_unlock; } ndp = TO_NCSI_DEV_PRIV(nd); /* Add the VLAN id to our internal list / + rcu_read_lock(); list_for_each_entry_rcu(vlan, &ndp->vlan_vids, list) { n_vids++; if (vlan->vid == vid) { netdev_dbg(dev, "NCSI: vid %u already registered\n", vid); - return 0; + rcu_read_unlock(); + ret = 0; + goto out_unlock; } } + rcu_read_unlock(); if (n_vids >= NCSI_MAX_VLAN_VIDS) { netdev_warn(dev, "tried to add vlan id %u but NCSI max already registered (%u)\n", vid, NCSI_MAX_VLAN_VIDS); - return -ENOSPC; + ret = -ENOSPC; + goto out_unlock; } vlan = kzalloc_obj(vlan); - if (!vlan) - return -ENOMEM; + if (!vlan) { + ret = -ENOMEM; + goto out_unlock; + } vlan->proto = proto; vlan->vid = vid; @@ -1709,45 +1776,60 @@ int ncsi_vlan_rx_add_vid(struct net_device dev, __be16 proto, u16 vid) found = ncsi_kick_channels(ndp) != 0; - return found ? ncsi_process_next_channel(ndp) : 0; + ret = found ? ncsi_process_next_channel(ndp) : 0; +out_unlock: + mutex_unlock(&ncsi_dev_mutex); + return ret; } EXPORT_SYMBOL_GPL(ncsi_vlan_rx_add_vid); int ncsi_vlan_rx_kill_vid(struct net_device dev, __be16 proto, u16 vid) { - struct vlan_vid vlan, tmp; + struct vlan_vid vlan; struct ncsi_dev_priv ndp; struct ncsi_dev nd; bool found = false; + int ret; if (vid == 0) return 0; + mutex_lock(&ncsi_dev_mutex); + rcu_read_lock(); nd = ncsi_find_dev(dev); + rcu_read_unlock(); if (!nd) { netdev_warn(dev, "NCSI: no net_device?\n"); - return 0; + ret = 0; + goto out_unlock; } ndp = TO_NCSI_DEV_PRIV(nd); / Remove the VLAN id from our internal list / - list_for_each_entry_safe(vlan, tmp, &ndp->vlan_vids, list) + rcu_read_lock(); + list_for_each_entry_rcu(vlan, &ndp->vlan_vids, list) if (vlan->vid == vid) { netdev_dbg(dev, "NCSI: vid %u found, removing\n", vid); list_del_rcu(&vlan->list); found = true; - kfree(vlan); + kfree_rcu(vlan, rcu); + break; } + rcu_read_unlock(); if (!found) { netdev_err(dev, "NCSI: vid %u wasn't registered!\n", vid); - return -EINVAL; + ret = -EINVAL; + goto out_unlock; } found = ncsi_kick_channels(ndp) != 0; - return found ? ncsi_process_next_channel(ndp) : 0; + ret = found ? ncsi_process_next_channel(ndp) : 0; +out_unlock: + mutex_unlock(&ncsi_dev_mutex); + return ret; } EXPORT_SYMBOL_GPL(ncsi_vlan_rx_kill_vid); @@ -1762,14 +1844,21 @@ struct ncsi_dev ncsi_register_dev(struct net_device dev, int i; / Check if the device has been registered or not / + mutex_lock(&ncsi_dev_mutex); + rcu_read_lock(); nd = ncsi_find_dev(dev); - if (nd) + rcu_read_unlock(); + if (nd) { + mutex_unlock(&ncsi_dev_mutex); return nd; + } / Create NCSI device / ndp = kzalloc_obj(ndp, GFP_ATOMIC); - if (!ndp) + if (!ndp) { + mutex_unlock(&ncsi_dev_mutex); return NULL; + } nd = &ndp->ndev; nd->state = ncsi_dev_state_registered; @@ -1810,6 +1899,7 @@ struct ncsi_dev ncsi_register_dev(struct net_device dev, ndp->mlx_multi_host = true; } + mutex_unlock(&ncsi_dev_mutex); return nd; } EXPORT_SYMBOL_GPL(ncsi_register_dev); @@ -1851,10 +1941,12 @@ void ncsi_stop_dev(struct ncsi_dev nd) NCSI_FOR_EACH_CHANNEL(np, nc) { ncsi_stop_channel_monitor(nc); - spin_lock_irqsave(&nc->lock, flags); + spin_lock_irqsave(&ndp->lock, flags); + spin_lock(&nc->lock); chained = !list_empty(&nc->link); old_state = nc->state; - spin_unlock_irqrestore(&nc->lock, flags); + spin_unlock(&nc->lock); + spin_unlock_irqrestore(&ndp->lock, flags); WARN_ON_ONCE(chained \|\| old_state == NCSI_CHANNEL_INVISIBLE); @@ -1952,22 +2044,74 @@ int ncsi_reset_dev(struct ncsi_dev nd) return 0; } +void ncsi_unregister_dev_prepare(struct ncsi_dev nd) +{ + struct ncsi_dev_priv ndp = TO_NCSI_DEV_PRIV(nd); + struct ncsi_package np; + struct ncsi_channel nc; + int i; + unsigned long flags; + + mutex_lock(&ncsi_dev_mutex); + if (!ndp->unregister_prepared) { + ndp->unregister_prepared = true; + spin_lock_irqsave(&ncsi_dev_lock, flags); + list_del_rcu(&ndp->node); + spin_unlock_irqrestore(&ncsi_dev_lock, flags); + + dev_remove_pack(&ndp->ptype); + + /* Wait for lookups that found this device before it was unlinked. / + synchronize_rcu(); + + / Quiesce NCSI activity before the netdev is stopped. / + disable_work_sync(&ndp->work); + list_for_each_entry(np, &ndp->packages, node) + list_for_each_entry(nc, &np->channels, node) + ncsi_stop_channel_monitor(nc); + for (i = 0; i < ARRAY_SIZE(ndp->requests); i++) + timer_delete_sync(&ndp->requests[i].timer); + } + mutex_unlock(&ncsi_dev_mutex); +} +EXPORT_SYMBOL_GPL(ncsi_unregister_dev_prepare); + void ncsi_unregister_dev(struct ncsi_dev nd) { struct ncsi_dev_priv ndp = TO_NCSI_DEV_PRIV(nd); struct ncsi_package np, tmp; + struct vlan_vid vlan, vlan_tmp; unsigned long flags; + int i; - dev_remove_pack(&ndp->ptype); + ncsi_unregister_dev_prepare(nd); + for (i = 0; i < ARRAY_SIZE(ndp->requests); i++) { + struct ncsi_request nr = &ndp->requests[i]; - list_for_each_entry_safe(np, tmp, &ndp->packages, node) - ncsi_remove_package(np); + if (!nr->used) + continue; - spin_lock_irqsave(&ncsi_dev_lock, flags); - list_del_rcu(&ndp->node); - spin_unlock_irqrestore(&ncsi_dev_lock, flags); + if (nr->flags == NCSI_REQ_FLAG_NETLINK_DRIVEN && nr->cmd) { + struct ncsi_cmd_pkt cmd = (struct ncsi_cmd_pkt ) + skb_network_header(nr->cmd); + + rcu_read_lock(); + ncsi_find_package_and_channel(ndp, + cmd->cmd.common.channel, + &np, &nc); + rcu_read_unlock(); + ncsi_send_netlink_timeout(nr, np, nc); + } + ncsi_free_request(nr); + } - disable_work_sync(&ndp->work); + list_for_each_entry_safe(vlan, vlan_tmp, &ndp->vlan_vids, list) { + list_del_rcu(&vlan->list); + kfree_rcu(vlan, rcu); + } + + list_for_each_entry_safe(np, tmp, &ndp->packages, node) + ncsi_remove_package(np); kfree(ndp); } diff --git a/net/ncsi/ncsi-netlink.c b/net/ncsi/ncsi-netlink.c index 8cc538358f6a3..9d821cc220621 100644 --- a/net/ncsi/ncsi-netlink.c +++ b/net/ncsi/ncsi-netlink.c @@ -47,7 +47,9 @@ static struct ncsi_dev_priv ndp_from_ifindex(struct net net, u32 ifindex) return NULL; } + rcu_read_lock(); nd = ncsi_find_dev(dev); + rcu_read_unlock(); ndp = nd ? TO_NCSI_DEV_PRIV(nd) : NULL; dev_put(dev); @@ -100,11 +102,6 @@ static int ncsi_write_package_info(struct sk_buff skb, bool found; int rc; - if (id > ndp->package_num - 1) { - netdev_info(ndp->ndev.dev, "NCSI: No package with id %u\n", id); - return -ENODEV; - } - found = false; NCSI_FOR_EACH_PACKAGE(ndp, np) { if (np->id != id) @@ -169,19 +166,24 @@ static int ncsi_pkg_info_nl(struct sk_buff msg, struct genl_info info) if (!info->attrs[NCSI_ATTR_PACKAGE_ID]) return -EINVAL; - ndp = ndp_from_ifindex(genl_info_net(info), - nla_get_u32(info->attrs[NCSI_ATTR_IFINDEX])); - if (!ndp) - return -ENODEV; - skb = genlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); if (!skb) return -ENOMEM; + rcu_read_lock(); + ndp = ndp_from_ifindex(genl_info_net(info), + nla_get_u32(info->attrs[NCSI_ATTR_IFINDEX])); + if (!ndp) { + rcu_read_unlock(); + kfree_skb(skb); + return -ENODEV; + } + hdr = genlmsg_put(skb, info->snd_portid, info->snd_seq, &ncsi_genl_family, 0, NCSI_CMD_PKG_INFO); if (!hdr) { kfree_skb(skb); + rcu_read_unlock(); return -EMSGSIZE; } @@ -190,6 +192,7 @@ static int ncsi_pkg_info_nl(struct sk_buff msg, struct genl_info info) attr = nla_nest_start_noflag(skb, NCSI_ATTR_PACKAGE_LIST); if (!attr) { kfree_skb(skb); + rcu_read_unlock(); return -EMSGSIZE; } rc = ncsi_write_package_info(skb, ndp, package_id); @@ -202,10 +205,12 @@ static int ncsi_pkg_info_nl(struct sk_buff msg, struct genl_info info) nla_nest_end(skb, attr); genlmsg_end(skb, hdr); + rcu_read_unlock(); return genlmsg_reply(skb, info); err: kfree_skb(skb); + rcu_read_unlock(); return rc; } @@ -228,32 +233,39 @@ static int ncsi_pkg_info_all_nl(struct sk_buff skb, if (!attrs[NCSI_ATTR_IFINDEX]) return -EINVAL; - ndp = ndp_from_ifindex(get_net(sock_net(skb->sk)), + rcu_read_lock(); + ndp = ndp_from_ifindex(sock_net(skb->sk), nla_get_u32(attrs[NCSI_ATTR_IFINDEX])); - if (!ndp) + if (!ndp) { + rcu_read_unlock(); return -ENODEV; + } package_id = cb->args[0]; package = NULL; NCSI_FOR_EACH_PACKAGE(ndp, np) - if (np->id == package_id) + if (np->id >= package_id && + (!package \|\| np->id < package->id)) package = np; - if (!package) + if (!package) { + rcu_read_unlock(); return 0; /* done / + } hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, &ncsi_genl_family, NLM_F_MULTI, NCSI_CMD_PKG_INFO); if (!hdr) { - rc = -EMSGSIZE; - goto err; + rcu_read_unlock(); + return -EMSGSIZE; } attr = nla_nest_start_noflag(skb, NCSI_ATTR_PACKAGE_LIST); if (!attr) { - rc = -EMSGSIZE; - goto err; + genlmsg_cancel(skb, hdr); + rcu_read_unlock(); + return -EMSGSIZE; } rc = ncsi_write_package_info(skb, ndp, package->id); if (rc) { @@ -264,11 +276,14 @@ static int ncsi_pkg_info_all_nl(struct sk_buff skb, nla_nest_end(skb, attr); genlmsg_end(skb, hdr); - cb->args[0] = package_id + 1; + cb->args[0] = package->id + 1; - return skb->len; + rc = skb->len; + rcu_read_unlock(); + return rc; err: genlmsg_cancel(skb, hdr); + rcu_read_unlock(); return rc; } @@ -289,34 +304,43 @@ static int ncsi_set_interface_nl(struct sk_buff msg, struct genl_info info) if (!info->attrs[NCSI_ATTR_PACKAGE_ID]) return -EINVAL; - ndp = ndp_from_ifindex(get_net(sock_net(msg->sk)), + mutex_lock(&ncsi_dev_mutex); + ndp = ndp_from_ifindex(sock_net(msg->sk), nla_get_u32(info->attrs[NCSI_ATTR_IFINDEX])); - if (!ndp) + if (!ndp) { + mutex_unlock(&ncsi_dev_mutex); return -ENODEV; + } package_id = nla_get_u32(info->attrs[NCSI_ATTR_PACKAGE_ID]); package = NULL; + rcu_read_lock(); NCSI_FOR_EACH_PACKAGE(ndp, np) if (np->id == package_id) package = np; + rcu_read_unlock(); if (!package) { /* The user has set a package that does not exist / + mutex_unlock(&ncsi_dev_mutex); return -ERANGE; } channel = NULL; if (info->attrs[NCSI_ATTR_CHANNEL_ID]) { channel_id = nla_get_u32(info->attrs[NCSI_ATTR_CHANNEL_ID]); + rcu_read_lock(); NCSI_FOR_EACH_CHANNEL(package, nc) if (nc->id == channel_id) { channel = nc; break; } + rcu_read_unlock(); if (!channel) { netdev_info(ndp->ndev.dev, "NCSI: Channel %u does not exist!\n", channel_id); + mutex_unlock(&ncsi_dev_mutex); return -ERANGE; } } @@ -350,6 +374,7 @@ static int ncsi_set_interface_nl(struct sk_buff msg, struct genl_info info) if (!(ndp->flags & NCSI_DEV_RESET)) ncsi_reset_dev(&ndp->ndev); + mutex_unlock(&ncsi_dev_mutex); return 0; } @@ -365,10 +390,13 @@ static int ncsi_clear_interface_nl(struct sk_buff msg, struct genl_info info) if (!info->attrs[NCSI_ATTR_IFINDEX]) return -EINVAL; - ndp = ndp_from_ifindex(get_net(sock_net(msg->sk)), + mutex_lock(&ncsi_dev_mutex); + ndp = ndp_from_ifindex(sock_net(msg->sk), nla_get_u32(info->attrs[NCSI_ATTR_IFINDEX])); - if (!ndp) + if (!ndp) { + mutex_unlock(&ncsi_dev_mutex); return -ENODEV; + } / Reset any whitelists and disable multi mode / spin_lock_irqsave(&ndp->lock, flags); @@ -376,6 +404,7 @@ static int ncsi_clear_interface_nl(struct sk_buff msg, struct genl_info info) ndp->multi_package = false; spin_unlock_irqrestore(&ndp->lock, flags); + rcu_read_lock(); NCSI_FOR_EACH_PACKAGE(ndp, np) { spin_lock_irqsave(&np->lock, flags); np->multi_channel = false; @@ -383,12 +412,14 @@ static int ncsi_clear_interface_nl(struct sk_buff msg, struct genl_info info) np->preferred_channel = NULL; spin_unlock_irqrestore(&np->lock, flags); } + rcu_read_unlock(); netdev_info(ndp->ndev.dev, "NCSI: Cleared preferred package/channel\n"); / Update channel configuration / if (!(ndp->flags & NCSI_DEV_RESET)) ncsi_reset_dev(&ndp->ndev); + mutex_unlock(&ncsi_dev_mutex); return 0; } @@ -427,10 +458,12 @@ static int ncsi_send_cmd_nl(struct sk_buff msg, struct genl_info info) goto out; } - ndp = ndp_from_ifindex(get_net(sock_net(msg->sk)), + mutex_lock(&ncsi_dev_mutex); + ndp = ndp_from_ifindex(sock_net(msg->sk), nla_get_u32(info->attrs[NCSI_ATTR_IFINDEX])); if (!ndp) { ret = -ENODEV; + mutex_unlock(&ncsi_dev_mutex); goto out; } @@ -479,6 +512,7 @@ static int ncsi_send_cmd_nl(struct sk_buff msg, struct genl_info info) info->nlhdr, ret); } + mutex_unlock(&ncsi_dev_mutex); out: return ret; } @@ -553,7 +587,7 @@ int ncsi_send_netlink_timeout(struct ncsi_request nr, else nla_put_u32(skb, NCSI_ATTR_PACKAGE_ID, NCSI_PACKAGE_INDEX((((struct ncsi_pkt_hdr ) - nr->cmd->data)->channel))); + skb_network_header(nr->cmd))->channel))); if (nc) nla_put_u32(skb, NCSI_ATTR_CHANNEL_ID, nc->id); @@ -608,10 +642,13 @@ static int ncsi_set_package_mask_nl(struct sk_buff msg, if (!info->attrs[NCSI_ATTR_PACKAGE_MASK]) return -EINVAL; - ndp = ndp_from_ifindex(get_net(sock_net(msg->sk)), + mutex_lock(&ncsi_dev_mutex); + ndp = ndp_from_ifindex(sock_net(msg->sk), nla_get_u32(info->attrs[NCSI_ATTR_IFINDEX])); - if (!ndp) + if (!ndp) { + mutex_unlock(&ncsi_dev_mutex); return -ENODEV; + } spin_lock_irqsave(&ndp->lock, flags); if (nla_get_flag(info->attrs[NCSI_ATTR_MULTI_FLAG])) { @@ -639,6 +676,7 @@ static int ncsi_set_package_mask_nl(struct sk_buff msg, ncsi_reset_dev(&ndp->ndev); } + mutex_unlock(&ncsi_dev_mutex); return rc; } @@ -663,33 +701,43 @@ static int ncsi_set_channel_mask_nl(struct sk_buff msg, if (!info->attrs[NCSI_ATTR_CHANNEL_MASK]) return -EINVAL; - ndp = ndp_from_ifindex(get_net(sock_net(msg->sk)), + mutex_lock(&ncsi_dev_mutex); + ndp = ndp_from_ifindex(sock_net(msg->sk), nla_get_u32(info->attrs[NCSI_ATTR_IFINDEX])); - if (!ndp) + if (!ndp) { + mutex_unlock(&ncsi_dev_mutex); return -ENODEV; + } package_id = nla_get_u32(info->attrs[NCSI_ATTR_PACKAGE_ID]); package = NULL; + rcu_read_lock(); NCSI_FOR_EACH_PACKAGE(ndp, np) if (np->id == package_id) { package = np; break; } - if (!package) + rcu_read_unlock(); + if (!package) { + mutex_unlock(&ncsi_dev_mutex); return -ERANGE; + } spin_lock_irqsave(&package->lock, flags); channel = NULL; if (info->attrs[NCSI_ATTR_CHANNEL_ID]) { channel_id = nla_get_u32(info->attrs[NCSI_ATTR_CHANNEL_ID]); + rcu_read_lock(); NCSI_FOR_EACH_CHANNEL(np, nc) if (nc->id == channel_id) { channel = nc; break; } + rcu_read_unlock(); if (!channel) { spin_unlock_irqrestore(&package->lock, flags); + mutex_unlock(&ncsi_dev_mutex); return -ERANGE; } netdev_dbg(ndp->ndev.dev, @@ -721,6 +769,7 @@ static int ncsi_set_channel_mask_nl(struct sk_buff *msg, if (!(ndp->flags & NCSI_DEV_RESET)) ncsi_reset_dev(&ndp->ndev); + mutex_unlock(&ncsi_dev_mutex); return 0; }
3/2	2026/10/09 11:01	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 16287 output: 21 thoughts: 441 Thoughts: Analyzing this Kernel Patch Series Okay, so the task at hand is to evaluate a kernel patch series targeting amd64. My initial focus is to understand the scope of changes, so let's dive into the diff. I see that the changes touch these files: `drivers/net/ethernet/faraday/ftgmac100.c`, `include/net/ncsi.h`, `net/ncsi/internal.h`, `net/ncsi/ncsi-aen.c`, `net/ncsi/ncsi-manage.c`, and `net/ncsi/ncsi-netlink.c`. Right off the bat, I recognize that `drivers/net/ethernet/faraday/ftgmac100.c` indicates involvement with the Faraday FTGMAC100 ethernet driver, and the other files clearly relate to the NCSI subsystem – Network Controller Sideband Interface, which lives under `net/ncsi/`. My first instinct is to determine if this ftgmac100 driver is somehow architecture-specific, like an ARM/ASPEED BMC driver, or if it can be reasonably accessed in a standard environment. More importantly, how does NCSI integrate with the FTGMAC100 driver? I recall that NCSI has a netlink interface, specifically through `ncsi-netlink.c`. That’s key. Now I need to figure out the dependencies, specifically, who calls `ncsi_register_dev`. Can NCSI operate independently of the ftgmac100 driver? Or can I use the ftgmac100 driver in QEMU to facilitate testing? Or can I interact with NCSI purely via netlink? A quick scan of `ncsi-netlink.c` reveals these netlink handlers, which are going to be important to understand: `ncsi_pkg_info_nl`, `ncsi_pkg_info_all_nl`, `ncsi_set_interface_nl`, `ncsi_clear_interface_nl`, `ncsi_send_cmd_nl`, `ncsi_set_package_mask_nl`, and `ncsi_set_channel_mask_nl`. I'll need to understand the intent of these. To fully understand the relationships, the next logical step is to grep the kernel for calls to `ncsi_register_dev`. This will clearly show the calling contexts and interactions within the kernel.
4/2	2026/10/09 11:01	tool	grepper	0m Args: { "Expression": "ncsi_register_dev" } Results: { "Output": "drivers/net/ethernet/faraday/ftgmac100.c=1848=static int ftgmac100_probe_ncsi(struct net_device netdev,\n--\ndrivers/net/ethernet/faraday/ftgmac100.c-1862-\tpriv-\u003euse_ncsi = true;\ndrivers/net/ethernet/faraday/ftgmac100.c:1863:\tpriv-\u003endev = ncsi_register_dev(netdev, ftgmac100_ncsi_handler);\ndrivers/net/ethernet/faraday/ftgmac100.c-1864-\tif (!priv-\u003endev)\n--\ninclude/net/ncsi.h=35=int ncsi_vlan_rx_kill_vid(struct net_device dev, __be16 proto, u16 vid);\ninclude/net/ncsi.h:36:struct ncsi_dev ncsi_register_dev(struct net_device dev,\ninclude/net/ncsi.h-37-\t\t\t\t void (notifier)(struct ncsi_dev nd));\n--\ninclude/net/ncsi.h=52=static inline int ncsi_vlan_rx_kill_vid(struct net_device dev, __be16 proto, u16 vid)\n--\ninclude/net/ncsi.h-56-\ninclude/net/ncsi.h:57:static inline struct ncsi_dev ncsi_register_dev(struct net_device dev,\ninclude/net/ncsi.h-58-\t\t\t\t\tvoid (notifier)(struct ncsi_dev nd))\n--\nnet/ncsi/ncsi-manage.c=1834=EXPORT_SYMBOL_GPL(ncsi_vlan_rx_kill_vid);\nnet/ncsi/ncsi-manage.c-1835-\nnet/ncsi/ncsi-manage.c:1836:struct ncsi_dev ncsi_register_dev(struct net_device dev,\nnet/ncsi/ncsi-manage.c-1837-\t\t\t\t void (handler)(struct ncsi_dev *ndev))\n--\nnet/ncsi/ncsi-manage.c-1904-}\nnet/ncsi/ncsi-manage.c:1905:EXPORT_SYMBOL_GPL(ncsi_register_dev);\nnet/ncsi/ncsi-manage.c-1906-\n" }
5/2	2026/10/09 11:01	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 17942 output: 19 thoughts: 55 Thoughts: Okay, here's my thought process on this, from my perspective as someone well-versed in this area: Analyzing the NCSi Registration Hold on a second... just `ftgmac100.c` calls `ncsi_register_dev`? That seems a bit... limited. It's unusual for a crucial registration function like that to be so narrowly used. I need to be absolutely certain. Let me quickly scan for any other potential drivers or modules. Before I launch into a deep dive, though, I should probably do a broader search – case-sensitivity can trip me up sometimes, so I'll make sure to run a case-insensitive search to catch anything I might have missed initially. I'll also double check for alternative references or naming conventions. I'd hate to miss something simple.
6/2	2026/10/09 11:01	tool	grepper	0m Args: { "Expression": "ncsi_register" } Results: { "Output": "drivers/net/ethernet/faraday/ftgmac100.c=1848=static int ftgmac100_probe_ncsi(struct net_device netdev,\n--\ndrivers/net/ethernet/faraday/ftgmac100.c-1862-\tpriv-\u003euse_ncsi = true;\ndrivers/net/ethernet/faraday/ftgmac100.c:1863:\tpriv-\u003endev = ncsi_register_dev(netdev, ftgmac100_ncsi_handler);\ndrivers/net/ethernet/faraday/ftgmac100.c-1864-\tif (!priv-\u003endev)\n--\ninclude/net/ncsi.h=35=int ncsi_vlan_rx_kill_vid(struct net_device dev, __be16 proto, u16 vid);\ninclude/net/ncsi.h:36:struct ncsi_dev ncsi_register_dev(struct net_device dev,\ninclude/net/ncsi.h-37-\t\t\t\t void (notifier)(struct ncsi_dev nd));\n--\ninclude/net/ncsi.h=52=static inline int ncsi_vlan_rx_kill_vid(struct net_device dev, __be16 proto, u16 vid)\n--\ninclude/net/ncsi.h-56-\ninclude/net/ncsi.h:57:static inline struct ncsi_dev ncsi_register_dev(struct net_device dev,\ninclude/net/ncsi.h-58-\t\t\t\t\tvoid (notifier)(struct ncsi_dev nd))\n--\nnet/ncsi/ncsi-manage.c=1834=EXPORT_SYMBOL_GPL(ncsi_vlan_rx_kill_vid);\nnet/ncsi/ncsi-manage.c-1835-\nnet/ncsi/ncsi-manage.c:1836:struct ncsi_dev ncsi_register_dev(struct net_device dev,\nnet/ncsi/ncsi-manage.c-1837-\t\t\t\t void (handler)(struct ncsi_dev *ndev))\n--\nnet/ncsi/ncsi-manage.c-1904-}\nnet/ncsi/ncsi-manage.c:1905:EXPORT_SYMBOL_GPL(ncsi_register_dev);\nnet/ncsi/ncsi-manage.c-1906-\n" }
7/2	2026/10/09 11:01	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 18838 output: 34 thoughts: 31 Thoughts: Okay, here's my take on those thoughts, tailored for an expert audience: Diving into FTGMAC100 and NET_NCSI Configuration Alright, time to get to the heart of this. My immediate thought is to check two critical areas: `ftgmac100.c` itself and the relevant Kconfig settings. I need to refresh my understanding of how the FTGMAC100 driver handles the NET_NCSI functionality. I expect the driver source will reveal the implementation details – how it's initialized, how NCSI packets are framed and transmitted, and any specific hardware interactions related to NCSI. From a high level I know that NCSI, or Network Controller Sideband Interface, is a protocol for in-band management. I want to look for details of this implementation. Then, I'll need to scrutinize the Kconfig entries associated with both NET_NCSI and, specifically, the FTGMAC100 configuration options. I want to understand: * Which features are enabled by default. * The dependencies and relationships between NET_NCSI, the FTGMAC100 driver, and any other relevant kernel subsystems. * How the user can configure the NCSI functionality (enable/disable, potentially set parameters, etc.). * And finally, I'm checking for any potential pitfalls, such as overlapping resources or conflicting configuration options that I may need to be aware of. It will be interesting to review the interactions between these two files. The objective is to ensure that the driver is configured correctly for the desired NCSI behaviour.
8/2	2026/10/09 11:01	tool	grepper	0m Args: { "Expression": "NET_NCSI", "PathPrefixes": [ "net/", "drivers/net/" ] } Results: { "Output": "drivers/net/ethernet/faraday/ftgmac100.c=1848=static int ftgmac100_probe_ncsi(struct net_device *netdev,\n--\ndrivers/net/ethernet/faraday/ftgmac100.c-1855-\ndrivers/net/ethernet/faraday/ftgmac100.c:1856:\tif (!IS_ENABLED(CONFIG_NET_NCSI)) {\ndrivers/net/ethernet/faraday/ftgmac100.c-1857-\t\tdev_err(\u0026pdev-\u003edev, \"NCSI stack not enabled\\n\");\n--\nnet/Makefile=71=obj-$(CONFIG_QRTR)\t\t+= qrtr/\nnet/Makefile:72:obj-$(CONFIG_NET_NCSI)\t\t+= ncsi/\nnet/Makefile-73-obj-$(CONFIG_XDP_SOCKETS)\t+= xdp/\n--\nnet/ncsi/Kconfig-5-\nnet/ncsi/Kconfig:6:config NET_NCSI\nnet/ncsi/Kconfig-7-\tbool \"NCSI interface support\"\n--\nnet/ncsi/Kconfig=14=config NCSI_OEM_CMD_GET_MAC\nnet/ncsi/Kconfig-15-\tbool \"Get NCSI OEM MAC Address\"\nnet/ncsi/Kconfig:16:\tdepends on NET_NCSI\nnet/ncsi/Kconfig-17-\thelp\n--\nnet/ncsi/Kconfig=20=config NCSI_OEM_CMD_KEEP_PHY\nnet/ncsi/Kconfig-21-\tbool \"Keep PHY Link up\"\nnet/ncsi/Kconfig:22:\tdepends on NET_NCSI\nnet/ncsi/Kconfig-23-\thelp\n--\nnet/ncsi/Makefile-4-#\nnet/ncsi/Makefile:5:obj-$(CONFIG_NET_NCSI) += ncsi-cmd.o ncsi-rsp.o ncsi-aen.o ncsi-manage.o ncsi-netlink.o\n" }
9/2	2026/10/09 11:01	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 19773 output: 40 thoughts: 51 Thoughts: Here's my analysis of the situation, focusing on how I'd approach this problem: NCSI and Generic Netlink: A Quick Dive Okay, so I need to understand how NCSI (Network Controller Sideband Interface) leverages generic netlink. My immediate instinct is to crack open the code and see exactly how it's implemented. Specifically, `net/ncsi/ncsi-netlink.c` is the logical place to start. This file should contain the core logic for the netlink interface used by NCSI. I'm assuming it defines the netlink family, handles messages, and probably has some routines for interacting with the NCSI hardware or driver itself. I'll need to look for message handlers, attribute definitions, and any functions that bridge the gap between netlink commands and NCSI-specific actions. Time to dive in!
10/2	2026/10/09 11:02	tool	read-file	0m Args: { "File": "net/ncsi/ncsi-netlink.c", "FirstLine": 1, "LineCount": 80 } Results: { "Contents": " 1:\t// SPDX-License-Identifier: GPL-2.0-or-later\n 2:\t/\n 3:\t Copyright Samuel Mendoza-Jonas, IBM Corporation 2018.\n 4:\t /\n 5:\t\n 6:\t#include \u003clinux/module.h\u003e\n 7:\t#include \u003clinux/kernel.h\u003e\n 8:\t#include \u003clinux/if_arp.h\u003e\n 9:\t#include \u003clinux/rtnetlink.h\u003e\n 10:\t#include \u003clinux/etherdevice.h\u003e\n 11:\t#include \u003cnet/genetlink.h\u003e\n 12:\t#include \u003cnet/ncsi.h\u003e\n 13:\t#include \u003clinux/skbuff.h\u003e\n 14:\t#include \u003cnet/sock.h\u003e\n 15:\t#include \u003cuapi/linux/ncsi.h\u003e\n 16:\t\n 17:\t#include \"internal.h\"\n 18:\t#include \"ncsi-pkt.h\"\n 19:\t#include \"ncsi-netlink.h\"\n 20:\t\n 21:\tstatic struct genl_family ncsi_genl_family;\n 22:\t\n 23:\tstatic const struct nla_policy ncsi_genl_policy[NCSI_ATTR_MAX + 1] = {\n 24:\t\t[NCSI_ATTR_IFINDEX] =\t\t{ .type = NLA_U32 },\n 25:\t\t[NCSI_ATTR_PACKAGE_LIST] =\t{ .type = NLA_NESTED },\n 26:\t\t[NCSI_ATTR_PACKAGE_ID] =\t{ .type = NLA_U32 },\n 27:\t\t[NCSI_ATTR_CHANNEL_ID] =\t{ .type = NLA_U32 },\n 28:\t\t[NCSI_ATTR_DATA] =\t\t{ .type = NLA_BINARY, .len = 2048 },\n 29:\t\t[NCSI_ATTR_MULTI_FLAG] =\t{ .type = NLA_FLAG },\n 30:\t\t[NCSI_ATTR_PACKAGE_MASK] =\t{ .type = NLA_U32 },\n 31:\t\t[NCSI_ATTR_CHANNEL_MASK] =\t{ .type = NLA_U32 },\n 32:\t};\n 33:\t\n 34:\tstatic struct ncsi_dev_priv ndp_from_ifindex(struct net net, u32 ifindex)\n 35:\t{\n 36:\t\tstruct ncsi_dev_priv ndp;\n 37:\t\tstruct net_device dev;\n 38:\t\tstruct ncsi_dev nd;\n 39:\t\tstruct ncsi_dev;\n 40:\t\n 41:\t\tif (!net)\n 42:\t\t\treturn NULL;\n 43:\t\n 44:\t\tdev = dev_get_by_index(net, ifindex);\n 45:\t\tif (!dev) {\n 46:\t\t\tpr_err(\"NCSI netlink: No device for ifindex %u\\n\", ifindex);\n 47:\t\t\treturn NULL;\n 48:\t\t}\n 49:\t\n 50:\t\trcu_read_lock();\n 51:\t\tnd = ncsi_find_dev(dev);\n 52:\t\trcu_read_unlock();\n 53:\t\tndp = nd ? TO_NCSI_DEV_PRIV(nd) : NULL;\n 54:\t\n 55:\t\tdev_put(dev);\n 56:\t\treturn ndp;\n 57:\t}\n 58:\t\n 59:\tstatic int ncsi_write_channel_info(struct sk_buff skb,\n 60:\t\t\t\t\t struct ncsi_dev_priv ndp,\n 61:\t\t\t\t\t struct ncsi_channel nc)\n 62:\t{\n 63:\t\tstruct ncsi_channel_vlan_filter ncf;\n 64:\t\tstruct ncsi_channel_mode m;\n 65:\t\tstruct nlattr vid_nest;\n 66:\t\tint i;\n 67:\t\n 68:\t\tnla_put_u32(skb, NCSI_CHANNEL_ATTR_ID, nc-\u003eid);\n 69:\t\tm = \u0026nc-\u003emodes[NCSI_MODE_LINK];\n 70:\t\tnla_put_u32(skb, NCSI_CHANNEL_ATTR_LINK_STATE, m-\u003edata[2]);\n 71:\t\tif (nc-\u003estate == NCSI_CHANNEL_ACTIVE)\n 72:\t\t\tnla_put_flag(skb, NCSI_CHANNEL_ATTR_ACTIVE);\n 73:\t\tif (nc == nc-\u003epackage-\u003epreferred_channel)\n 74:\t\t\tnla_put_flag(skb, NCSI_CHANNEL_ATTR_FORCED);\n 75:\t\n 76:\t\tnla_put_u32(skb, NCSI_CHANNEL_ATTR_VERSION_MAJOR, nc-\u003eversion.major);\n 77:\t\tnla_put_u32(skb, NCSI_CHANNEL_ATTR_VERSION_MINOR, nc-\u003eversion.minor);\n 78:\t\tnla_put_string(skb, NCSI_CHANNEL_ATTR_VERSION_STR, nc-\u003eversion.fw_name);\n 79:\t\n 80:\t\tvid_nest = nla_nest_start_noflag(skb, NCSI_CHANNEL_ATTR_VLAN_LIST);\n" }
11/2	2026/10/09 11:02	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 21433 output: 22 thoughts: 14 Thoughts: Okay, let's dive into this. Here's my understanding, presented as my own mental processing: Initial Check: ncsi_init_netlink Alright, I'm thinking, "Okay, let's take a look at `ncsi_init_netlink`." My initial assumption is that this function likely pertains to the initialization of the Netlink interface within the NCSI (Network Controller Sideband Interface) framework. Given my experience, I'm expecting this function to be a critical piece of the puzzle. It's the starting point for establishing communication and control between the host operating system and a remote network controller, likely embedded somewhere. I anticipate it will involve tasks like allocating resources, registering necessary Netlink message handlers, and possibly even setting up initial connection parameters. I know this is the entrypoint to the driver in this portion, so I need to explore how the other Netlink interfaces interact with this function.
12/2	2026/10/09 11:02	tool	grepper	0m Args: { "Expression": "ncsi_init_netlink" } Results: { "Output": "net/ncsi/ncsi-netlink.c=816=static struct genl_family ncsi_genl_family __ro_after_init = {\n--\nnet/ncsi/ncsi-netlink.c-826-\nnet/ncsi/ncsi-netlink.c:827:static int __init ncsi_init_netlink(void)\nnet/ncsi/ncsi-netlink.c-828-{\n--\nnet/ncsi/ncsi-netlink.c-830-}\nnet/ncsi/ncsi-netlink.c:831:subsys_initcall(ncsi_init_netlink);\n" }
13/2	2026/10/09 11:02	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 21854 output: 42 thoughts: 104 Thoughts: NCSI Netlink Initialization Thoughts Okay, so the `subsys_initcall(ncsi_init_netlink);` call is how this all kicks off. That's a key point. If CONFIG_NET_NCSI is enabled, `ncsi_init_netlink` is responsible for registering `ncsi_genl_family` with generic netlink. That makes sense; NCSI uses netlink for communication. Now, the real question is, what specific commands are actually being registered under `ncsi_genl_family`? I need to look deeper. Let me dive into `net/ncsi/ncsi-netlink.c`, specifically lines 750 through 835. That's where the definition should be. Time to see what's being exposed via netlink.
14/2	2026/10/09 11:02	tool	read-file	0m Args: { "File": "net/ncsi/ncsi-netlink.c", "FirstLine": 750, "LineCount": 85 } Results: { "Contents": " 750:\t\tif (package-\u003echannel_whitelist == 0)\n 751:\t\t\tnetdev_dbg(ndp-\u003endev.dev,\n 752:\t\t\t\t \"NCSI: Package %u set to all channels disabled\\n\",\n 753:\t\t\t\t package-\u003eid);\n 754:\t\n 755:\t\tpackage-\u003epreferred_channel = channel;\n 756:\t\n 757:\t\tif (nla_get_flag(info-\u003eattrs[NCSI_ATTR_MULTI_FLAG])) {\n 758:\t\t\tpackage-\u003emulti_channel = true;\n 759:\t\t\tnetdev_info(ndp-\u003endev.dev,\n 760:\t\t\t\t \"NCSI: Multi-channel enabled on package %u\\n\",\n 761:\t\t\t\t package_id);\n 762:\t\t} else {\n 763:\t\t\tpackage-\u003emulti_channel = false;\n 764:\t\t}\n 765:\t\n 766:\t\tspin_unlock_irqrestore(\u0026package-\u003elock, flags);\n 767:\t\n 768:\t\t/* Update channel configuration */\n 769:\t\tif (!(ndp-\u003eflags \u0026 NCSI_DEV_RESET))\n 770:\t\t\tncsi_reset_dev(\u0026ndp-\u003endev);\n 771:\t\n 772:\t\tmutex_unlock(\u0026ncsi_dev_mutex);\n 773:\t\treturn 0;\n 774:\t}\n 775:\t\n 776:\tstatic const struct genl_small_ops ncsi_ops[] = {\n 777:\t\t{\n 778:\t\t\t.cmd = NCSI_CMD_PKG_INFO,\n 779:\t\t\t.validate = GENL_DONT_VALIDATE_STRICT \| GENL_DONT_VALIDATE_DUMP,\n 780:\t\t\t.doit = ncsi_pkg_info_nl,\n 781:\t\t\t.dumpit = ncsi_pkg_info_all_nl,\n 782:\t\t\t.flags = 0,\n 783:\t\t},\n 784:\t\t{\n 785:\t\t\t.cmd = NCSI_CMD_SET_INTERFACE,\n 786:\t\t\t.validate = GENL_DONT_VALIDATE_STRICT \| GENL_DONT_VALIDATE_DUMP,\n 787:\t\t\t.doit = ncsi_set_interface_nl,\n 788:\t\t\t.flags = GENL_ADMIN_PERM,\n 789:\t\t},\n 790:\t\t{\n 791:\t\t\t.cmd = NCSI_CMD_CLEAR_INTERFACE,\n 792:\t\t\t.validate = GENL_DONT_VALIDATE_STRICT \| GENL_DONT_VALIDATE_DUMP,\n 793:\t\t\t.doit = ncsi_clear_interface_nl,\n 794:\t\t\t.flags = GENL_ADMIN_PERM,\n 795:\t\t},\n 796:\t\t{\n 797:\t\t\t.cmd = NCSI_CMD_SEND_CMD,\n 798:\t\t\t.validate = GENL_DONT_VALIDATE_STRICT \| GENL_DONT_VALIDATE_DUMP,\n 799:\t\t\t.doit = ncsi_send_cmd_nl,\n 800:\t\t\t.flags = GENL_ADMIN_PERM,\n 801:\t\t},\n 802:\t\t{\n 803:\t\t\t.cmd = NCSI_CMD_SET_PACKAGE_MASK,\n 804:\t\t\t.validate = GENL_DONT_VALIDATE_STRICT \| GENL_DONT_VALIDATE_DUMP,\n 805:\t\t\t.doit = ncsi_set_package_mask_nl,\n 806:\t\t\t.flags = GENL_ADMIN_PERM,\n 807:\t\t},\n 808:\t\t{\n 809:\t\t\t.cmd = NCSI_CMD_SET_CHANNEL_MASK,\n 810:\t\t\t.validate = GENL_DONT_VALIDATE_STRICT \| GENL_DONT_VALIDATE_DUMP,\n 811:\t\t\t.doit = ncsi_set_channel_mask_nl,\n 812:\t\t\t.flags = GENL_ADMIN_PERM,\n 813:\t\t},\n 814:\t};\n 815:\t\n 816:\tstatic struct genl_family ncsi_genl_family __ro_after_init = {\n 817:\t\t.name = \"NCSI\",\n 818:\t\t.version = 0,\n 819:\t\t.maxattr = NCSI_ATTR_MAX,\n 820:\t\t.policy = ncsi_genl_policy,\n 821:\t\t.module = THIS_MODULE,\n 822:\t\t.small_ops = ncsi_ops,\n 823:\t\t.n_small_ops = ARRAY_SIZE(ncsi_ops),\n 824:\t\t.resv_start_op = NCSI_CMD_SET_CHANNEL_MASK + 1,\n 825:\t};\n 826:\t\n 827:\tstatic int __init ncsi_init_netlink(void)\n 828:\t{\n 829:\t\treturn genl_register_family(\u0026ncsi_genl_family);\n 830:\t}\n 831:\tsubsys_initcall(ncsi_init_netlink);\n" }
15/2	2026/10/09 11:02	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 23551 output: 27 thoughts: 339 Thoughts: My NCSI Investigation Okay, let's break down how this NCSI thing actually operates. First question: can userspace actually interact with NCSI using generic netlink commands? Yep, sounds like it! If `CONFIG_NET_NCSI` is enabled, any process should be able to send genl messages to the "NCSI" family. Intriguing. Now, what happens when userspace sends a command, say, a request for package info using `ncsi_pkg_info_nl` with a specific `ifindex`? Let's trace it. The code seems to call `ndp_from_ifindex`. Within that function: ```c dev = dev_get_by_index(net, ifindex); if (!dev) { pr_err("NCSI netlink: No device for ifindex %u\n", ifindex); return NULL; } rcu_read_lock(); nd = ncsi_find_dev(dev); rcu_read_unlock(); ndp = nd ? TO_NCSI_DEV_PRIV(nd) : NULL; dev_put(dev); return ndp; ``` Interesting. It retrieves the network device by `ifindex`, searches for an `ncsi_dev` (`nd`), and returns the corresponding private data (`ndp`). But where do these `ncsi_dev` structures come from? How are they created? Who calls `ncsi_register_dev`? A quick `grep` indicated that the `drivers/net/ethernet/faraday/ftgmac100.c` driver was the only caller. But that can't be right! Is the FTGMAC100 driver really the only one registering itself with NCSI? That seems too narrow. Time to broaden the search. I need to make sure I am not missing anything, let's check for other drivers that call `ncsi_*` functions to be certain.
16/2	2026/10/09 11:02	tool	grepper	0m Args: { "Expression": "ncsi_", "PathPrefixes": [ "drivers/" ] } Results: { "Output": "\nFull output is too long, showing 200 out of 358 lines.\nUse more precise expression or PathPrefixes if possible.\n\nNumber of matching lines per file (21 files in total):\ndrivers/infiniband/hw/ocrdma/ocrdma_sli.h:1\ndrivers/net/ethernet/broadcom/bnge/bnge_devlink.c:6\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_hsi.h:4\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c:3\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_mfw_req.h:1\ndrivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c:6\ndrivers/net/ethernet/chelsio/cxgb4/t4_hw.c:4\ndrivers/net/ethernet/emulex/benet/be_cmds.c:2\ndrivers/net/ethernet/faraday/ftgmac100.c:14\ndrivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c:5\ndrivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_err.c:6\ndrivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_mbx.c:4\ndrivers/net/ethernet/marvell/octeon_ep/octep_rx.h:2\ndrivers/net/ethernet/marvell/octeon_ep_vf/octep_vf_rx.h:2\ndrivers/net/ethernet/qlogic/qed/qed_mfw_hsi.h:3\ndrivers/net/ethernet/wangxun/libwx/wx_type.h:1\ndrivers/net/ethernet/wangxun/ngbe/ngbe_main.c:3\ndrivers/scsi/be2iscsi/be_mgmt.h:1\ndrivers/scsi/csiostor/csio_hw.c:4\ndrivers/scsi/elx/libefc_sli/sli4.h:1\ndrivers/scsi/lpfc/lpfc_hw4.h:1\n\ndrivers/infiniband/hw/ocrdma/ocrdma_sli.h=2123=struct mgmt_hba_attribs {\n--\ndrivers/infiniband/hw/ocrdma/ocrdma_sli.h-2129-\tu32 epfw_ds_ver;\ndrivers/infiniband/hw/ocrdma/ocrdma_sli.h:2130:\tu8 ncsi_ver_string[12];\ndrivers/infiniband/hw/ocrdma/ocrdma_sli.h-2131-\tu32 default_extended_timeout;\n--\ndrivers/net/ethernet/broadcom/bnge/bnge_devlink.c=73=static int bnge_devlink_info_get(struct devlink devlink,\n--\ndrivers/net/ethernet/broadcom/bnge/bnge_devlink.c-81-\tchar roce_ver[FW_VER_STR_LEN];\ndrivers/net/ethernet/broadcom/bnge/bnge_devlink.c:82:\tchar ncsi_ver[FW_VER_STR_LEN];\ndrivers/net/ethernet/broadcom/bnge/bnge_devlink.c-83-\tchar buf[32];\n--\ndrivers/net/ethernet/broadcom/bnge/bnge_devlink.c-161-\ndrivers/net/ethernet/broadcom/bnge/bnge_devlink.c:162:\t\tsnprintf(ncsi_ver, FW_VER_STR_LEN, \"%d.%d.%d.%d\",\ndrivers/net/ethernet/broadcom/bnge/bnge_devlink.c-163-\t\t\t ver_resp-\u003emgmt_fw_major, ver_resp-\u003emgmt_fw_minor,\n--\ndrivers/net/ethernet/broadcom/bnge/bnge_devlink.c-173-\ndrivers/net/ethernet/broadcom/bnge/bnge_devlink.c:174:\t\tsnprintf(ncsi_ver, FW_VER_STR_LEN, \"%d.%d.%d.%d\",\ndrivers/net/ethernet/broadcom/bnge/bnge_devlink.c-175-\t\t\t ver_resp-\u003emgmt_fw_maj_8b, ver_resp-\u003emgmt_fw_min_8b,\n--\ndrivers/net/ethernet/broadcom/bnge/bnge_devlink.c-199-\trc = bnge_dl_info_put(bd, req, BNGE_VERSION_RUNNING,\ndrivers/net/ethernet/broadcom/bnge/bnge_devlink.c:200:\t\t\t DEVLINK_INFO_VERSION_GENERIC_FW_NCSI, ncsi_ver);\ndrivers/net/ethernet/broadcom/bnge/bnge_devlink.c-201-\tif (rc) {\n--\ndrivers/net/ethernet/broadcom/bnge/bnge_devlink.c-238-\ndrivers/net/ethernet/broadcom/bnge/bnge_devlink.c:239:\tsnprintf(ncsi_ver, FW_VER_STR_LEN, \"%d.%d.%d.%d\",\ndrivers/net/ethernet/broadcom/bnge/bnge_devlink.c-240-\t\t nvm_dev_info.mgmt_fw_major, nvm_dev_info.mgmt_fw_minor,\n--\ndrivers/net/ethernet/broadcom/bnge/bnge_devlink.c-242-\trc = bnge_dl_info_put(bd, req, BNGE_VERSION_STORED,\ndrivers/net/ethernet/broadcom/bnge/bnge_devlink.c:243:\t\t\t DEVLINK_INFO_VERSION_GENERIC_FW_NCSI, ncsi_ver);\ndrivers/net/ethernet/broadcom/bnge/bnge_devlink.c-244-\tif (rc) {\n--\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_hsi.h=2042=struct os_drv_ver {\n--\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_hsi.h-2054-\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_hsi.h:2055:struct ncsi_oem_fcoe_features {\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_hsi.h-2056-\tu32 fcoe_features1;\n--\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_hsi.h=2107=struct mdump_driver_info {\n--\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_hsi.h-2120-\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_hsi.h:2121:struct ncsi_oem_data {\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_hsi.h-2122-\tu32 driver_version[4];\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_hsi.h:2123:\tstruct ncsi_oem_fcoe_features ncsi_oem_fcoe_features;\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_hsi.h-2124-};\n--\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_hsi.h=2126=struct shmem2_region {\n--\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_hsi.h-2227-\tu32 extended_dev_info_shared_addr;\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_hsi.h:2228:\tu32 ncsi_oem_data_addr;\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_hsi.h-2229-\n--\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c=14669=static int bnx2x_drv_ctl(struct net_device dev, struct drv_ctl_info ctl)\n--\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c-14778-\t\t\tif ((ulp_type != CNIC_ULP_FCOE) \|\|\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c:14779:\t\t\t (!SHMEM2_HAS(bp, ncsi_oem_data_addr)) \|\|\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c-14780-\t\t\t (!(bp-\u003eflags \u0026 BC_SUPPORTS_FCOE_FEATURES)))\n--\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c-14783-\t\t\t/ if reached here - should write fcoe capabilities /\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c:14784:\t\t\tscratch_offset = SHMEM2_RD(bp, ncsi_oem_data_addr);\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c-14785-\t\t\tif (!scratch_offset)\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c-14786-\t\t\t\tbreak;\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c:14787:\t\t\tscratch_offset += offsetof(struct glob_ncsi_oem_data,\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c-14788-\t\t\t\t\t\t fcoe_features[path][port]);\n--\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_mfw_req.h=21=struct fcoe_capabilities {\n--\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_mfw_req.h-51-\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_mfw_req.h:52:struct glob_ncsi_oem_data {\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_mfw_req.h-53-\tu32 driver_version;\n--\ndrivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c=856=static int bnxt_dl_info_get(struct devlink dl, struct devlink_info_req req,\n--\ndrivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c-863-\tchar roce_ver[FW_VER_STR_LEN];\ndrivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c:864:\tchar ncsi_ver[FW_VER_STR_LEN];\ndrivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c-865-\tchar buf[32];\n--\ndrivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c-930-\ndrivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c:931:\t\tsnprintf(ncsi_ver, FW_VER_STR_LEN, \"%d.%d.%d.%d\",\ndrivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c-932-\t\t\t ver_resp-\u003emgmt_fw_major, ver_resp-\u003emgmt_fw_minor,\n--\ndrivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c-942-\ndrivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c:943:\t\tsnprintf(ncsi_ver, FW_VER_STR_LEN, \"%d.%d.%d.%d\",\ndrivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c-944-\t\t\t ver_resp-\u003emgmt_fw_maj_8b, ver_resp-\u003emgmt_fw_min_8b,\n--\ndrivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c-962-\trc = bnxt_dl_info_put(bp, req, BNXT_VERSION_RUNNING,\ndrivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c:963:\t\t\t DEVLINK_INFO_VERSION_GENERIC_FW_NCSI, ncsi_ver);\ndrivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c-964-\tif (rc)\n--\ndrivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c-996-\ndrivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c:997:\tsnprintf(ncsi_ver, FW_VER_STR_LEN, \"%d.%d.%d.%d\",\ndrivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c-998-\t\t nvm_dev_info.mgmt_fw_major, nvm_dev_info.mgmt_fw_minor,\n--\ndrivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c-1000-\trc = bnxt_dl_info_put(bp, req, BNXT_VERSION_STORED,\ndrivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c:1001:\t\t\t DEVLINK_INFO_VERSION_GENERIC_FW_NCSI, ncsi_ver);\ndrivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c-1002-\tif (rc)\n--\ndrivers/net/ethernet/chelsio/cxgb4/t4_hw.c=4913=static void smb_intr_handler(struct adapter adap)\n--\ndrivers/net/ethernet/chelsio/cxgb4/t4_hw.c-4928- /\ndrivers/net/ethernet/chelsio/cxgb4/t4_hw.c:4929:static void ncsi_intr_handler(struct adapter adap)\ndrivers/net/ethernet/chelsio/cxgb4/t4_hw.c-4930-{\ndrivers/net/ethernet/chelsio/cxgb4/t4_hw.c:4931:\tstatic const struct intr_info ncsi_intr_info[] = {\ndrivers/net/ethernet/chelsio/cxgb4/t4_hw.c-4932-\t\t{ CIM_DM_PRTY_ERR_F, \"NC-SI CIM parity error\", -1, 1 },\n--\ndrivers/net/ethernet/chelsio/cxgb4/t4_hw.c-4938-\ndrivers/net/ethernet/chelsio/cxgb4/t4_hw.c:4939:\tif (t4_handle_intr_status(adap, NCSI_INT_CAUSE_A, ncsi_intr_info))\ndrivers/net/ethernet/chelsio/cxgb4/t4_hw.c-4940-\t\tt4_fatal_err(adap);\n--\ndrivers/net/ethernet/chelsio/cxgb4/t4_hw.c=4999=int t4_slow_intr_handler(struct adapter adapter)\n--\ndrivers/net/ethernet/chelsio/cxgb4/t4_hw.c-5015-\tif (cause \u0026 NCSI_F)\ndrivers/net/ethernet/chelsio/cxgb4/t4_hw.c:5016:\t\tncsi_intr_handler(adapter);\ndrivers/net/ethernet/chelsio/cxgb4/t4_hw.c-5017-\tif (cause \u0026 PL_F)\n--\ndrivers/net/ethernet/emulex/benet/be_cmds.c=2692=static int be_flash(struct be_adapter adapter, const u8 img,\n--\ndrivers/net/ethernet/emulex/benet/be_cmds.c-2733-#define NCSI_UPDATE_LOG\t\"NCSI section update is not supported in FW ver %s\\n\"\ndrivers/net/ethernet/emulex/benet/be_cmds.c:2734:static bool be_fw_ncsi_supported(char ver)\ndrivers/net/ethernet/emulex/benet/be_cmds.c-2735-{\n--\ndrivers/net/ethernet/emulex/benet/be_cmds.c=2754=static int be_flash_BEx(struct be_adapter adapter,\n--\ndrivers/net/ethernet/emulex/benet/be_cmds.c-2829-\t\tif ((pflashcomp[i].optype == OPTYPE_NCSI_FW) \u0026\u0026\ndrivers/net/ethernet/emulex/benet/be_cmds.c:2830:\t\t !be_fw_ncsi_supported(adapter-\u003efw_ver)) {\ndrivers/net/ethernet/emulex/benet/be_cmds.c-2831-\t\t\tdev_info(dev, NCSI_UPDATE_LOG, adapter-\u003efw_ver);\n--\ndrivers/net/ethernet/faraday/ftgmac100.c=43=struct ftgmac100_match_data {\n--\ndrivers/net/ethernet/faraday/ftgmac100.c-66-/ For NC-SI to register a fixed-link phy device /\ndrivers/net/ethernet/faraday/ftgmac100.c:67:static struct fixed_phy_status ncsi_phy_status = {\ndrivers/net/ethernet/faraday/ftgmac100.c-68-\t.link = 1,\n--\ndrivers/net/ethernet/faraday/ftgmac100.c=75=struct ftgmac100 {\n--\ndrivers/net/ethernet/faraday/ftgmac100.c-109-\tstruct device dev;\ndrivers/net/ethernet/faraday/ftgmac100.c:110:\tstruct ncsi_dev ndev;\ndrivers/net/ethernet/faraday/ftgmac100.c-111-\tstruct napi_struct napi;\n--\ndrivers/net/ethernet/faraday/ftgmac100.c=1561=static int ftgmac100_open(struct net_device netdev)\n--\ndrivers/net/ethernet/faraday/ftgmac100.c-1617-\t\t/* Start the NCSI device /\ndrivers/net/ethernet/faraday/ftgmac100.c:1618:\t\terr = ncsi_start_dev(priv-\u003endev);\ndrivers/net/ethernet/faraday/ftgmac100.c-1619-\t\tif (err)\n--\ndrivers/net/ethernet/faraday/ftgmac100.c=1640=static int ftgmac100_stop(struct net_device netdev)\n--\ndrivers/net/ethernet/faraday/ftgmac100.c-1660-\tif (priv-\u003euse_ncsi)\ndrivers/net/ethernet/faraday/ftgmac100.c:1661:\t\tncsi_stop_dev(priv-\u003endev);\ndrivers/net/ethernet/faraday/ftgmac100.c-1662-\n--\ndrivers/net/ethernet/faraday/ftgmac100.c=1717=static const struct net_device_ops ftgmac100_netdev_ops = {\n--\ndrivers/net/ethernet/faraday/ftgmac100.c-1729-#endif\ndrivers/net/ethernet/faraday/ftgmac100.c:1730:\t.ndo_vlan_rx_add_vid\t= ncsi_vlan_rx_add_vid,\ndrivers/net/ethernet/faraday/ftgmac100.c:1731:\t.ndo_vlan_rx_kill_vid\t= ncsi_vlan_rx_kill_vid,\ndrivers/net/ethernet/faraday/ftgmac100.c-1732-};\n--\ndrivers/net/ethernet/faraday/ftgmac100.c=1780=static void ftgmac100_phy_disconnect(struct net_device netdev)\n--\ndrivers/net/ethernet/faraday/ftgmac100.c-1795-\ndrivers/net/ethernet/faraday/ftgmac100.c:1796:static void ftgmac100_ncsi_handler(struct ncsi_dev nd)\ndrivers/net/ethernet/faraday/ftgmac100.c-1797-{\ndrivers/net/ethernet/faraday/ftgmac100.c:1798:\tif (unlikely(nd-\u003estate != ncsi_dev_state_functional))\ndrivers/net/ethernet/faraday/ftgmac100.c-1799-\t\treturn;\n--\ndrivers/net/ethernet/faraday/ftgmac100.c=1848=static int ftgmac100_probe_ncsi(struct net_device netdev,\n--\ndrivers/net/ethernet/faraday/ftgmac100.c-1862-\tpriv-\u003euse_ncsi = true;\ndrivers/net/ethernet/faraday/ftgmac100.c:1863:\tpriv-\u003endev = ncsi_register_dev(netdev, ftgmac100_ncsi_handler);\ndrivers/net/ethernet/faraday/ftgmac100.c-1864-\tif (!priv-\u003endev)\n--\ndrivers/net/ethernet/faraday/ftgmac100.c-1866-\ndrivers/net/ethernet/faraday/ftgmac100.c:1867:\tphydev = fixed_phy_register(\u0026ncsi_phy_status, np);\ndrivers/net/ethernet/faraday/ftgmac100.c-1868-\tif (IS_ERR(phydev)) {\n--\ndrivers/net/ethernet/faraday/ftgmac100.c-1884-\tif (priv-\u003endev)\ndrivers/net/ethernet/faraday/ftgmac100.c:1885:\t\tncsi_unregister_dev(priv-\u003endev);\ndrivers/net/ethernet/faraday/ftgmac100.c-1886-\tpriv-\u003endev = NULL;\n--\ndrivers/net/ethernet/faraday/ftgmac100.c=1942=static int ftgmac100_probe(struct platform_device pdev)\n--\ndrivers/net/ethernet/faraday/ftgmac100.c-2097-\tif (priv-\u003endev) {\ndrivers/net/ethernet/faraday/ftgmac100.c:2098:\t\tncsi_unregister_dev(priv-\u003endev);\ndrivers/net/ethernet/faraday/ftgmac100.c-2099-\t\tpriv-\u003endev = NULL;\n--\ndrivers/net/ethernet/faraday/ftgmac100.c=2104=static void ftgmac100_remove(struct platform_device *pdev)\n--\ndrivers/net/ethernet/faraday/ftgmac100.c-2112-\tif (priv-\u003endev)\ndrivers/net/ethernet/faraday/ftgmac100.c:2113:\t\tncsi_unregister_dev_prepare(priv-\u003endev);\ndrivers/net/ethernet/faraday/ftgmac100.c-2114-\tunregister_netdev(netdev);\ndrivers/net/ethernet/faraday/ftgmac100.c-2115-\tif (priv-\u003endev) {\ndrivers/net/ethernet/faraday/ftgmac100.c:2116:\t\tncsi_unregister_dev(priv-\u003endev);\ndrivers/net/ethernet/faraday/ftgmac100.c-2117-\t\tpriv-\u003endev = NULL;\n--\ndrivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c=302=static const struct hclge_dbg_dfx_message hclge_dbg_rpu_reg_1[] = {\n--\ndrivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c-317-\ndrivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c:318:static const struct hclge_dbg_dfx_message hclge_dbg_ncsi_reg[] = {\ndrivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c-319-\t{false, \"Reserved\"},\n\n" }
17/2	2026/10/09 11:02	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 30834 output: 38 thoughts: 154 Thoughts: NCSI Interaction in ftgmac100.c Alright, let's see. Looking at the code, it's clear that the `drivers/net/ethernet/faraday/ftgmac100.c` driver is the only one directly interacting with the NCSI (Network Controller Sideband Interface) subsystem using those specific functions: `ncsi_register_dev`, `ncsi_start_dev`, `ncsi_stop_dev`, `ncsi_vlan_rx_add_vid`, `ncsi_vlan_rx_kill_vid`, `ncsi_unregister_dev_prepare`, and `ncsi_unregister_dev`. That's a focused area of interaction. Now, a critical question arises. I need to know if this `ftgmac100` driver is actually reachable in a typical amd64 environment, especially under syzkaller or a virtualized setup. The whole point of the analysis would be moot if the driver wasn't even built into the target kernel configuration! The dependency could render the analysis useless. Time to check the `Kconfig` file in the same directory, specifically `drivers/net/ethernet/faraday/Kconfig`. I need to verify that this driver is, indeed, available in the scenarios I'm working with.
18/2	2026/10/09 11:02	tool	read-file	0m Args: { "File": "drivers/net/ethernet/faraday/Kconfig", "FirstLine": 1, "LineCount": 50 } Results: { "Contents": " 1:\t# SPDX-License-Identifier: GPL-2.0-only\n 2:\t#\n 3:\t# Faraday device configuration\n 4:\t#\n 5:\t\n 6:\tconfig NET_VENDOR_FARADAY\n 7:\t\tbool \"Faraday devices\"\n 8:\t\tdefault y\n 9:\t\tdepends on ARM \|\| COMPILE_TEST\n 10:\t\thelp\n 11:\t\t If you have a network (Ethernet) card belonging to this class, say Y.\n 12:\t\n 13:\t\t Note that the answer to this question doesn't directly affect the\n 14:\t\t kernel: saying N will just cause the configurator to skip all\n 15:\t\t the questions about Faraday cards. If you say Y, you will be asked for\n 16:\t\t your specific card in the following questions.\n 17:\t\n 18:\tif NET_VENDOR_FARADAY\n 19:\t\n 20:\tconfig FTMAC100\n 21:\t\ttristate \"Faraday FTMAC100 10/100 Ethernet support\"\n 22:\t\tdepends on ARM \|\| COMPILE_TEST\n 23:\t\tdepends on !64BIT \|\| BROKEN\n 24:\t\tselect MII\n 25:\t\thelp\n 26:\t\t This driver supports the FTMAC100 10/100 Ethernet controller\n 27:\t\t from Faraday. It is used on Faraday A320 and some other ARM SoC's.\n 28:\t\n 29:\tconfig FTGMAC100\n 30:\t\ttristate \"Faraday FTGMAC100 Gigabit Ethernet support\"\n 31:\t\tdepends on ARM \|\| COMPILE_TEST\n 32:\t\tdepends on !64BIT \|\| BROKEN\n 33:\t\tselect PHYLIB\n 34:\t\tselect FIXED_PHY\n 35:\t\tselect MDIO_ASPEED if MACH_ASPEED_G6\n 36:\t\tselect CRC32\n 37:\t\thelp\n 38:\t\t This driver supports the FTGMAC100 Gigabit Ethernet controller\n 39:\t\t from Faraday. It is used on Faraday A369 and some other ARM SoC's.\n 40:\t\n 41:\tendif # NET_VENDOR_FARADAY\n" }
19/2	2026/10/09 11:02	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 31898 output: 44 thoughts: 86 Thoughts: Okay, let me break this down. Diving into the FTGMAC100 Driver's Dependencies Alright, so I'm looking at this condition: `FTGMAC100` hinges on `(ARM \|\| COMPILE_TEST) && (!64BIT \|\| BROKEN)`. Hmm, that's interesting. It looks like the inclusion of this driver is gated by a few things. It's either built for ARM or the `COMPILE_TEST` flag is set, and crucially, either it's not for 64-bit systems or the build environment has the `BROKEN` flag enabled. This suggests some platform-specific or testing-oriented constraints are at play. And wait a second... it's a platform driver! That changes things. Since it's a platform driver I can assume it's going to have a `struct platform_driver`. Okay, let me confirm: `static struct platform_driver ftgmac100_driver`. Yes, that checks out. Now, where do I need to go to understand how it's being used? I need to dig into `ftgmac100.c`. I'm looking for where `module_platform_driver` is called or the probe function is defined. That'll be my starting point to see how this driver is initialized and how those conditional dependencies affect its behavior at runtime.
20/2	2026/10/09 11:02	tool	grepper	0m Args: { "Expression": "module_platform_driver", "PathPrefixes": [ "drivers/net/ethernet/faraday/ftgmac100.c" ] } Results: { "Output": "drivers/net/ethernet/faraday/ftgmac100.c=2157=static struct platform_driver ftgmac100_driver = {\n--\ndrivers/net/ethernet/faraday/ftgmac100.c-2164-};\ndrivers/net/ethernet/faraday/ftgmac100.c:2165:module_platform_driver(ftgmac100_driver);\ndrivers/net/ethernet/faraday/ftgmac100.c-2166-\n" }
21/2	2026/10/09 11:02	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 32476 output: 23 thoughts: 85 Thoughts: NCSI Registration and Device Drivers Okay, hold on a second. I'm trying to wrap my head around this. Can we actually instantiate these platform devices, or are we unnecessarily tied to the `ftgmac100` driver to reach the NCSI functionality? It feels like there might be a more elegant solution here. Right! Let's take a closer look at `net/ncsi`. I need to understand what's in that directory. What are the key components and dependencies? Does anything else have the capability to register `ncsi`? I'm getting a nagging feeling that we might be overlooking something fundamental here. Alright, time to get to the core of the matter. I need to understand this specific commit and its reasoning. Let's delve into the `git log` to get some historical context and understand the original intent of the patch. That should help clear things up and prevent a possible code redundancy.
22/2	2026/10/09 11:02	tool	grepper	0m Args: { "Expression": "ncsi_unregister_dev_prepare" } Results: { "Output": "drivers/net/ethernet/faraday/ftgmac100.c=2104=static void ftgmac100_remove(struct platform_device pdev)\n--\ndrivers/net/ethernet/faraday/ftgmac100.c-2112-\tif (priv-\u003endev)\ndrivers/net/ethernet/faraday/ftgmac100.c:2113:\t\tncsi_unregister_dev_prepare(priv-\u003endev);\ndrivers/net/ethernet/faraday/ftgmac100.c-2114-\tunregister_netdev(netdev);\n--\ninclude/net/ncsi.h=39=void ncsi_stop_dev(struct ncsi_dev nd);\n--\ninclude/net/ncsi.h-43- /\ninclude/net/ncsi.h:44:void ncsi_unregister_dev_prepare(struct ncsi_dev nd);\ninclude/net/ncsi.h-45-void ncsi_unregister_dev(struct ncsi_dev nd);\n--\ninclude/net/ncsi.h=68=static inline void ncsi_stop_dev(struct ncsi_dev nd)\n--\ninclude/net/ncsi.h-71-\ninclude/net/ncsi.h:72:static inline void ncsi_unregister_dev_prepare(struct ncsi_dev nd)\ninclude/net/ncsi.h-73-{\n--\nnet/ncsi/ncsi-manage.c=1961=int ncsi_reset_dev(struct ncsi_dev nd)\n--\nnet/ncsi/ncsi-manage.c-2046-\nnet/ncsi/ncsi-manage.c:2047:void ncsi_unregister_dev_prepare(struct ncsi_dev nd)\nnet/ncsi/ncsi-manage.c-2048-{\n--\nnet/ncsi/ncsi-manage.c-2076-}\nnet/ncsi/ncsi-manage.c:2077:EXPORT_SYMBOL_GPL(ncsi_unregister_dev_prepare);\nnet/ncsi/ncsi-manage.c-2078-\nnet/ncsi/ncsi-manage.c=2079=void ncsi_unregister_dev(struct ncsi_dev nd)\n--\nnet/ncsi/ncsi-manage.c-2086-\nnet/ncsi/ncsi-manage.c:2087:\tncsi_unregister_dev_prepare(nd);\nnet/ncsi/ncsi-manage.c-2088-\tfor (i = 0; i \u003c ARRAY_SIZE(ndp-\u003erequests); i++) {\n" }
23/2	2026/10/09 11:02	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 33509 output: 47 thoughts: 293 Thoughts: Analyzing Reachability: A Thought Process Okay, hold on a second! Before diving too deep, let's back up and see if there's an easier path. Can we get some useful information from the Git history? Can we use `git show` somehow to see commit messages that might shed light on this? Damn, we don't have that tool directly. But wait, do we even have any tools at our disposal? Let's quickly double-check the declared tools... okay, let's see, we have `grepper`, `codesearch-dir-index`, `read-file`, and `set-results`. No Bash, no Git, nothing directly suitable. However, we have all the source code, so we can work with that! Right, so let's carefully analyze the actual reachability of this target. We're looking at an amd64 architecture, so let's start there. Hang on... a quick sanity check first: Is FTGMAC100 even buildable on amd64? Let's check the dependency flags. Ah, there it is: `depends on ARM \|\| COMPILE_TEST` and `depends on !64BIT \|\| BROKEN`. This is crucial. Since we're on amd64 (`CONFIG_64BIT=y`), FTGMAC100 requires both `CONFIG_BROKEN=y` and `CONFIG_COMPILE_TEST=y` to even be considered. And even if we jump through those compiler hoops, it's a platform driver for ARM / Aspeed SoC (`mach-aspeed`), so there are hardware dependencies. To verify this, I'll need to go directly to `ftgmac100_probe` and its of_match table in `ftgmac100.c` to look at exactly what device it's probing for.
24/2	2026/10/09 11:02	tool	read-file	0m Args: { "File": "drivers/net/ethernet/faraday/ftgmac100.c", "FirstLine": 2130, "LineCount": 45 } Results: { "Contents": "2130:\t};\n2131:\t\n2132:\tstatic const struct ftgmac100_match_data ftgmac100_match_data_ast2500 = {\n2133:\t\t.mac_id = FTGMAC100_AST2500\n2134:\t};\n2135:\t\n2136:\tstatic const struct ftgmac100_match_data ftgmac100_match_data_ast2600 = {\n2137:\t\t.mac_id = FTGMAC100_AST2600\n2138:\t};\n2139:\t\n2140:\tstatic const struct ftgmac100_match_data ftgmac100_match_data_faraday = {\n2141:\t\t.mac_id = FTGMAC100_FARADAY\n2142:\t};\n2143:\t\n2144:\tstatic const struct of_device_id ftgmac100_of_match[] = {\n2145:\t\t{ .compatible = \"aspeed,ast2400-mac\",\n2146:\t\t .data = \u0026ftgmac100_match_data_ast2400},\n2147:\t\t{ .compatible = \"aspeed,ast2500-mac\",\n2148:\t\t .data = \u0026ftgmac100_match_data_ast2500 },\n2149:\t\t{ .compatible = \"aspeed,ast2600-mac\",\n2150:\t\t .data = \u0026ftgmac100_match_data_ast2600 },\n2151:\t\t{ .compatible = \"faraday,ftgmac100\",\n2152:\t\t .data = \u0026ftgmac100_match_data_faraday },\n2153:\t\t{ }\n2154:\t};\n2155:\tMODULE_DEVICE_TABLE(of, ftgmac100_of_match);\n2156:\t\n2157:\tstatic struct platform_driver ftgmac100_driver = {\n2158:\t\t.probe\t= ftgmac100_probe,\n2159:\t\t.remove = ftgmac100_remove,\n2160:\t\t.driver\t= {\n2161:\t\t\t.name\t\t= DRV_NAME,\n2162:\t\t\t.of_match_table\t= ftgmac100_of_match,\n2163:\t\t},\n2164:\t};\n2165:\tmodule_platform_driver(ftgmac100_driver);\n2166:\t\n2167:\tMODULE_AUTHOR(\"Po-Yu Chuang \u003cratbert@faraday-tech.com\u003e\");\n2168:\tMODULE_DESCRIPTION(\"FTGMAC100 driver\");\n2169:\tMODULE_LICENSE(\"GPL\");\n" }
25/2	2026/10/09 11:02	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 35006 output: 21 thoughts: 105 Thoughts: NCSI Concerns and Code Exploration Okay, hold on a minute. Before we proceed further, I need to circle back to something that's been nagging at me. What about the `net/ncsi/` subsystem? It's a critical piece, and I need to ensure it's accounted for. The immediate question is, is `net/ncsi` reachable? Can the network stack interact with it successfully? In other words, is there proper network connectivity with `net/ncsi`? And even more fundamentally, what's its purpose? I need a clear understanding of its role in the bigger picture. To get a better handle on this, I'll need to explore the code. My first instinct is to see if any other parts of the system interact with it. So, let's start by searching for calls to `ncsi_find_dev` or `ncsi_register_dev`, or any direct registrations of an NCSI device. A quick grep of the entire codebase is in order to unearth all related interactions.
26/2	2026/10/09 11:03	tool	grepper	0m Args: { "Expression": "ncsi_find_dev" } Results: { "Output": "net/ncsi/internal.h=404=void ncsi_free_request(struct ncsi_request nr);\nnet/ncsi/internal.h:405:struct ncsi_dev ncsi_find_dev(struct net_device dev);\nnet/ncsi/internal.h-406-int ncsi_process_next_channel(struct ncsi_dev_priv ndp);\n--\nnet/ncsi/ncsi-manage.c=398=void ncsi_free_request(struct ncsi_request nr)\n--\nnet/ncsi/ncsi-manage.c-426-\nnet/ncsi/ncsi-manage.c:427:struct ncsi_dev ncsi_find_dev(struct net_device dev)\nnet/ncsi/ncsi-manage.c-428-{\n--\nnet/ncsi/ncsi-manage.c=1720=int ncsi_vlan_rx_add_vid(struct net_device dev, __be16 proto, u16 vid)\n--\nnet/ncsi/ncsi-manage.c-1733-\trcu_read_lock();\nnet/ncsi/ncsi-manage.c:1734:\tnd = ncsi_find_dev(dev);\nnet/ncsi/ncsi-manage.c-1735-\trcu_read_unlock();\n--\nnet/ncsi/ncsi-manage.c=1786=int ncsi_vlan_rx_kill_vid(struct net_device dev, __be16 proto, u16 vid)\n--\nnet/ncsi/ncsi-manage.c-1798-\trcu_read_lock();\nnet/ncsi/ncsi-manage.c:1799:\tnd = ncsi_find_dev(dev);\nnet/ncsi/ncsi-manage.c-1800-\trcu_read_unlock();\n--\nnet/ncsi/ncsi-manage.c=1836=struct ncsi_dev ncsi_register_dev(struct net_device dev,\n--\nnet/ncsi/ncsi-manage.c-1848-\trcu_read_lock();\nnet/ncsi/ncsi-manage.c:1849:\tnd = ncsi_find_dev(dev);\nnet/ncsi/ncsi-manage.c-1850-\trcu_read_unlock();\n--\nnet/ncsi/ncsi-netlink.c=34=static struct ncsi_dev_priv ndp_from_ifindex(struct net net, u32 ifindex)\n--\nnet/ncsi/ncsi-netlink.c-50-\trcu_read_lock();\nnet/ncsi/ncsi-netlink.c:51:\tnd = ncsi_find_dev(dev);\nnet/ncsi/ncsi-netlink.c-52-\trcu_read_unlock();\n--\nnet/ncsi/ncsi-rsp.c=1159=int ncsi_rcv_rsp(struct sk_buff skb, struct net_device dev,\n--\nnet/ncsi/ncsi-rsp.c-1170-\t/ Find the NCSI device */\nnet/ncsi/ncsi-rsp.c:1171:\tnd = ncsi_find_dev(orig_dev);\nnet/ncsi/ncsi-rsp.c-1172-\tndp = nd ? TO_NCSI_DEV_PRIV(nd) : NULL;\n" }
27/2	2026/10/09 11:03	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 36313 output: 41 thoughts: 56 Thoughts: Okay, let's break this down. Diving into the NCSI Device Discovery Alright, so I need to understand how this NCSI device discovery works. My initial thought is to examine the `ncsi_find_dev(dev)` function. Seems straightforward enough – it’s likely a lookup function, probably iterating through some sort of device list. Now, where is that list maintained? Right, the code suggests `ncsi_dev_list`. The next logical step is to pinpoint the definition and implementation of `ncsi_find_dev`. Let's navigate to the source file – I'll bet it's in `net/ncsi/ncsi-manage.c`. That's where the core management functions usually reside, and finding device information is certainly a management task. Time to dig in!
28/2	2026/10/09 11:03	tool	read-file	0m Args: { "File": "net/ncsi/ncsi-manage.c", "FirstLine": 425, "LineCount": 25 } Results: { "Contents": " 425:\t}\n 426:\t\n 427:\tstruct ncsi_dev ncsi_find_dev(struct net_device dev)\n 428:\t{\n 429:\t\tstruct ncsi_dev_priv ndp;\n 430:\t\n 431:\t\tNCSI_FOR_EACH_DEV(ndp) {\n 432:\t\t\tif (ndp-\u003endev.dev == dev)\n 433:\t\t\t\treturn \u0026ndp-\u003endev;\n 434:\t\t}\n 435:\t\n 436:\t\treturn NULL;\n 437:\t}\n 438:\t\n 439:\tstatic void ncsi_request_timeout(struct timer_list t)\n 440:\t{\n 441:\t\tstruct ncsi_request nr = timer_container_of(nr, t, timer);\n 442:\t\tstruct ncsi_dev_priv ndp = nr-\u003endp;\n 443:\t\tstruct ncsi_cmd_pkt cmd;\n 444:\t\tstruct ncsi_package np;\n 445:\t\tstruct ncsi_channel nc;\n 446:\t\tunsigned long flags;\n 447:\t\n 448:\t\t/ If the request already had associated response,\n 449:\t\t * let the response handler to release it.\n" }
29/2	2026/10/09 11:03	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 36959 output: 21 thoughts: 78 Thoughts: Here's my thought process, as requested: NCSI Device Discovery: Tracking the List Okay, so I'm looking at `ncsi_find_dev`. The code there is using the macro `NCSI_FOR_EACH_DEV(ndp)`. Right, that macro must be iterating over something. Let's see... it's iterating over `ncsi_dev_list`. That makes sense. Now the crucial question: where are devices actually being added to this `ncsi_dev_list`? That's the key to understanding the device discovery process. I need to trace the initialization and population of this list. Alright, time to get to the core. I need to find where this list is being modified. Let's search the codebase for usages of `list_add_rcu` because that's the standard function for adding an element to an RCU list, or more simply just look for every instance `ncsi_dev_list` and see where it shows up. That should give me a map of where devices are being registered and unregistered. From there, I can figure out the control flow, the order of events and the initialization steps.
30/2	2026/10/09 11:03	tool	grepper	0m Args: { "Expression": "ncsi_dev_list" } Results: { "Output": "net/ncsi/internal.h=355=struct ncsi_cmd_arg {\n--\nnet/ncsi/internal.h-371-\nnet/ncsi/internal.h:372:extern struct list_head ncsi_dev_list;\nnet/ncsi/internal.h-373-extern spinlock_t ncsi_dev_lock;\nnet/ncsi/internal.h=374=extern struct mutex ncsi_dev_mutex;\n--\nnet/ncsi/internal.h-378-#define NCSI_FOR_EACH_DEV(ndp) \\\nnet/ncsi/internal.h:379:\tlist_for_each_entry_rcu(ndp, \u0026ncsi_dev_list, node)\nnet/ncsi/internal.h-380-#define NCSI_FOR_EACH_PACKAGE(ndp, np) \\\n--\nnet/ncsi/ncsi-manage.c-25-\nnet/ncsi/ncsi-manage.c:26:LIST_HEAD(ncsi_dev_list);\nnet/ncsi/ncsi-manage.c-27-DEFINE_SPINLOCK(ncsi_dev_lock);\n--\nnet/ncsi/ncsi-manage.c=1836=struct ncsi_dev ncsi_register_dev(struct net_device dev,\n--\nnet/ncsi/ncsi-manage.c-1884-\tspin_lock_irqsave(\u0026ncsi_dev_lock, flags);\nnet/ncsi/ncsi-manage.c:1885:\tlist_add_tail_rcu(\u0026ndp-\u003enode, \u0026ncsi_dev_list);\nnet/ncsi/ncsi-manage.c-1886-\tspin_unlock_irqrestore(\u0026ncsi_dev_lock, flags);\n" }
31/2	2026/10/09 11:03	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 37806 output: 47 thoughts: 849 Thoughts: Analyzing the Unlikely Path to a Kernel Vulnerability Okay, let's break this down systematically. The core concern is `ncsi_dev_list`. I know from experience that it's populated exclusively by `ncsi_register_dev()`. So, I need to know where `ncsi_register_dev()` is called from. My grep confirms that `ftgmac100_probe_ncsi` is the sole caller. I need to be 100% sure, let's verify that's the only instance in the entire source tree! Yup, I'm right: `drivers/net/ethernet/faraday/ftgmac100.c` is the only call. Now, let's turn our attention to `ftgmac100`. Can it even probe on an amd64 system? I need to look closely at its setup. It's a platform driver, `module_platform_driver(ftgmac100_driver);`. Does it use ACPI? Nope, looking at the driver structure, there's only an OF (Device Tree) match table. Excellent. Let's dig deeper into the Kconfig: Line 32: `depends on !64BIT \|\| BROKEN`. Target architecture is amd64, so it has `64BIT=y`. Thus `FTGMAC100` cannot even be selected unless `CONFIG_BROKEN=y` and `CONFIG_COMPILE_TEST=y`. Even if we somehow managed to compile it with those options, it's still a Device Tree platform driver specifically designed for Aspeed BMCs (ast2400, ast2500, ast2600) or Faraday A369 ARM SoC! The question is, can this OF platform device for `aspeed,ast2400-mac` ever be instantiated on amd64 within the context of syzkaller (which is using QEMU x86_64)? QEMU x86_64 emulates standard PC or Q35 machines. That setup uses ACPI and PCI, not a Device Tree that instantiates Aspeed SoCs. Could syzkaller somehow create a platform device through userspace mechanisms, configfs, or an OF overlay? On x86_64, does device tree overlay work? No, x86 architecture isn't really a DT system. While you might enable `CONFIG_OF` for some unit tests, device tree overlays aren't standard, especially not to create memory-mapped SoC devices. Even if, somehow, an OF overlay could be loaded, `ftgmac100` directly accesses physical memory mapped I/O of Aspeed AST2400/2500/2600 MAC registers. So this can't happen on amd64 in any real way.
32/2	2026/10/09 11:03	tool	read-file	0m Args: { "File": "drivers/net/ethernet/faraday/ftgmac100.c", "FirstLine": 1942, "LineCount": 80 } Results: { "Contents": "1942:\tstatic int ftgmac100_probe(struct platform_device pdev)\n1943:\t{\n1944:\t\tconst struct ftgmac100_match_data match_data;\n1945:\t\tenum ftgmac100_mac_id mac_id;\n1946:\t\tstruct resource res;\n1947:\t\tint irq;\n1948:\t\tstruct net_device netdev;\n1949:\t\tstruct ftgmac100 priv;\n1950:\t\tstruct device_node np;\n1951:\t\tint err = 0;\n1952:\t\n1953:\t\tnp = pdev-\u003edev.of_node;\n1954:\t\tif (np) {\n1955:\t\t\tmatch_data = of_device_get_match_data(\u0026pdev-\u003edev);\n1956:\t\t\tif (!match_data)\n1957:\t\t\t\treturn -EINVAL;\n1958:\t\t\tmac_id = match_data-\u003emac_id;\n1959:\t\t} else {\n1960:\t\t\tmac_id = FTGMAC100_FARADAY;\n1961:\t\t}\n1962:\t\n1963:\t\tres = platform_get_resource(pdev, IORESOURCE_MEM, 0);\n1964:\t\tif (!res)\n1965:\t\t\treturn -ENXIO;\n1966:\t\n1967:\t\tirq = platform_get_irq(pdev, 0);\n1968:\t\tif (irq \u003c 0)\n1969:\t\t\treturn irq;\n1970:\t\n1971:\t\t/* setup net_device /\n1972:\t\tnetdev = devm_alloc_etherdev(\u0026pdev-\u003edev, sizeof(priv));\n1973:\t\tif (!netdev)\n1974:\t\t\treturn -ENOMEM;\n1975:\t\n1976:\t\tSET_NETDEV_DEV(netdev, \u0026pdev-\u003edev);\n1977:\t\n1978:\t\tnetdev-\u003eethtool_ops = \u0026ftgmac100_ethtool_ops;\n1979:\t\tnetdev-\u003enetdev_ops = \u0026ftgmac100_netdev_ops;\n1980:\t\tnetdev-\u003ewatchdog_timeo = 5 * HZ;\n1981:\t\n1982:\t\tplatform_set_drvdata(pdev, netdev);\n1983:\t\n1984:\t\t/* setup private data /\n1985:\t\tpriv = netdev_priv(netdev);\n1986:\t\tpriv-\u003enetdev = netdev;\n1987:\t\tpriv-\u003edev = \u0026pdev-\u003edev;\n1988:\t\tpriv-\u003emac_id = mac_id;\n1989:\t\tINIT_WORK(\u0026priv-\u003ereset_task, ftgmac100_reset_task);\n1990:\t\n1991:\t\t/ map io memory /\n1992:\t\tpriv-\u003eres = devm_request_mem_region(\u0026pdev-\u003edev,\n1993:\t\t\t\t\t\t res-\u003estart, resource_size(res),\n1994:\t\t\t\t\t\t dev_name(\u0026pdev-\u003edev));\n1995:\t\tif (!priv-\u003eres) {\n1996:\t\t\tdev_err(\u0026pdev-\u003edev, \"Could not reserve memory region\\n\");\n1997:\t\t\treturn -ENOMEM;\n1998:\t\t}\n1999:\t\n2000:\t\tpriv-\u003ebase = devm_ioremap(\u0026pdev-\u003edev, res-\u003estart, resource_size(res));\n2001:\t\tif (!priv-\u003ebase) {\n2002:\t\t\tdev_err(\u0026pdev-\u003edev, \"Failed to ioremap ethernet registers\\n\");\n2003:\t\t\treturn -EIO;\n2004:\t\t}\n2005:\t\n2006:\t\tnetdev-\u003eirq = irq;\n2007:\t\n2008:\t\t/ Enable pause /\n2009:\t\tpriv-\u003etx_pause = true;\n2010:\t\tpriv-\u003erx_pause = true;\n2011:\t\tpriv-\u003eaneg_pause = true;\n2012:\t\n2013:\t\t/ MAC address from chip or random one */\n2014:\t\terr = ftgmac100_initial_mac(priv);\n2015:\t\tif (err)\n2016:\t\t\treturn err;\n2017:\t\n2018:\t\tif (priv-\u003emac_id == FTGMAC100_AST2400 \|\|\n2019:\t\t priv-\u003emac_id == FTGMAC100_AST2500 \|\|\n2020:\t\t priv-\u003emac_id == FTGMAC100_AST2600) {\n2021:\t\t\tpriv-\u003erxdes0_edorr_mask = BIT(30);\n" }
33/2	2026/10/09 11:03	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 40608 output: 47 thoughts: 17 Thoughts: Okay, here's my interpretation of that thought process, tailored for an expert audience, and written in the first person: Analyzing the ftgmac100_probe_ncsi Function Alright, let's dive into this `ftgmac100_probe_ncsi` function. My initial thought is to immediately consider its context within the broader system. I'm assuming it's part of an ethernet driver, given the `ftgmac` prefix, and the `ncsi` suffix likely points to Network Controller Sideband Interface functionality. So, right off the bat, I need to understand where this fits into the overall probing sequence. Is it being called during device initialization, after the main ethernet device probe, or perhaps as part of a more specialized network configuration step? I'll be thinking about the data structures this function is likely interacting with. Structures like `struct net_device`, `struct pci_dev` (if it's PCI-based), and potentially some custom `ftgmac` specific structures are immediately on my mind. My immediate goal is to map the function's responsibility – what hardware it's identifying, what resources it's allocating, and how it's interacting with the NCSI controller itself. What I'm expecting to see is some sort of hardware detection, possibly PCI configuration space reads or direct register accesses to determine if an NCSI controller is present on the `ftgmac100` device. Then, I'd anticipate the function attempting to configure the NCSI controller, perhaps by setting up memory mapping for registers, enabling interrupts, or initializing some sort of communication channel. The details of NCSI are critical here; things like channel assignment, RMCP setup, and potential message filtering will be top of mind. Of course, error handling will be paramount. I'm looking for robust checks for register access failures, resource allocation issues, or communication problems with the NCSI controller. A well-written probe function should handle these gracefully, potentially falling back to a default configuration or returning an error code that alerts the system to the NCSI's failure. Essentially, I'm already mentally walking through possible scenarios: success, NCSI not present, hardware error. I'm anticipating the potential error code paths and hoping for informative logging to help debug future issues. Finally, I'll be assessing how well the function integrates into the device initialization, looking for any race conditions or resource conflicts with other drivers or hardware components.
34/2	2026/10/09 11:03	tool	read-file	0m Args: { "File": "drivers/net/ethernet/faraday/ftgmac100.c", "FirstLine": 1845, "LineCount": 45 } Results: { "Contents": "1845:\t\treturn ret;\n1846:\t}\n1847:\t\n1848:\tstatic int ftgmac100_probe_ncsi(struct net_device netdev,\n1849:\t\t\t\t\tstruct ftgmac100 priv,\n1850:\t\t\t\t\tstruct platform_device pdev)\n1851:\t{\n1852:\t\tstruct device_node np = pdev-\u003edev.of_node;\n1853:\t\tstruct phy_device *phydev;\n1854:\t\tint err;\n1855:\t\n1856:\t\tif (!IS_ENABLED(CONFIG_NET_NCSI)) {\n1857:\t\t\tdev_err(\u0026pdev-\u003edev, \"NCSI stack not enabled\\n\");\n1858:\t\t\treturn -EINVAL;\n1859:\t\t}\n1860:\t\n1861:\t\tdev_info(\u0026pdev-\u003edev, \"Using NCSI interface\\n\");\n1862:\t\tpriv-\u003euse_ncsi = true;\n1863:\t\tpriv-\u003endev = ncsi_register_dev(netdev, ftgmac100_ncsi_handler);\n1864:\t\tif (!priv-\u003endev)\n1865:\t\t\treturn -EINVAL;\n1866:\t\n1867:\t\tphydev = fixed_phy_register(\u0026ncsi_phy_status, np);\n1868:\t\tif (IS_ERR(phydev)) {\n1869:\t\t\tdev_err(\u0026pdev-\u003edev, \"failed to register fixed PHY device\\n\");\n1870:\t\t\terr = PTR_ERR(phydev);\n1871:\t\t\tgoto err_register_ndev;\n1872:\t\t}\n1873:\t\terr = phy_connect_direct(netdev, phydev, ftgmac100_adjust_link,\n1874:\t\t\t\t\t PHY_INTERFACE_MODE_RMII);\n1875:\t\tif (err) {\n1876:\t\t\tdev_err(\u0026pdev-\u003edev, \"Connecting PHY failed\\n\");\n1877:\t\t\tgoto err_register_phy;\n1878:\t\t}\n1879:\t\n1880:\t\treturn 0;\n1881:\terr_register_phy:\n1882:\t\tfixed_phy_unregister(phydev);\n1883:\terr_register_ndev:\n1884:\t\tif (priv-\u003endev)\n1885:\t\t\tncsi_unregister_dev(priv-\u003endev);\n1886:\t\tpriv-\u003endev = NULL;\n1887:\t\treturn err;\n1888:\t}\n1889:\t\n" }
35/2	2026/10/09 11:03	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 41885 output: 51 thoughts: 55 Thoughts: Here's my summary, as though I'm thinking through this process: NC-SI Probe Analysis Okay, let's dive into this `ftgmac100_probe_ncsi` function. My initial impression is that it's conditionally executed, specifically dependent on the `np` variable having the `use-nc-si` flag set. This immediately tells me that NC-SI (Network Controller Sideband Interface) is likely being leveraged. Now, to understand the broader context and potential implications, I need to see where this function is called. That will provide crucial context – who's calling it, under what circumstances, and what are they expecting to happen as a result? Let's trace back the calls to this function.
36/2	2026/10/09 11:03	tool	grepper	0m Args: { "Expression": "ftgmac100_probe_ncsi", "PathPrefixes": [ "drivers/net/ethernet/faraday/ftgmac100.c" ] } Results: { "Output": "drivers/net/ethernet/faraday/ftgmac100.c=1835=static bool ftgmac100_has_child_node(struct device_node np, const char name)\n--\ndrivers/net/ethernet/faraday/ftgmac100.c-1847-\ndrivers/net/ethernet/faraday/ftgmac100.c:1848:static int ftgmac100_probe_ncsi(struct net_device netdev,\ndrivers/net/ethernet/faraday/ftgmac100.c-1849-\t\t\t\tstruct ftgmac100 priv,\n--\ndrivers/net/ethernet/faraday/ftgmac100.c=1890=static int ftgmac100_probe_dt(struct net_device *netdev,\n--\ndrivers/net/ethernet/faraday/ftgmac100.c-1898-\tif (of_get_property(np, \"use-ncsi\", NULL))\ndrivers/net/ethernet/faraday/ftgmac100.c:1899:\t\treturn ftgmac100_probe_ncsi(netdev, priv, pdev);\ndrivers/net/ethernet/faraday/ftgmac100.c-1900-\n" }
37/2	2026/10/09 11:03	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 42494 output: 17 thoughts: 713 Thoughts: NCSI Netlink Interface Analysis Okay, so I'm diving into this NCSI stuff and it looks like `ftgmac100_probe_ncsi` is the gatekeeper here, only called from `ftgmac100_probe_dt` if that `use-ncsi` property is present. But, hang on... what about that generic netlink interface defined in `net/ncsi/ncsi-netlink.c`? I need to understand if userspace can actually do anything with NCSI via netlink. Let's trace it. Can userspace actually invoke NCSI commands through netlink? The answer is yes. Syzkaller is capable of generating messages to the "NCSI" family. Excellent. Now, where is this family defined? The function `genl_register_family(&ncsi_genl_family)` is called by `ncsi_init_netlink()` on boot, but only if `CONFIG_NET_NCSI=y`, so that's a key configuration check. Alright, so, when userspace sends a netlink message to the `NCSI` family, what happens? Let's trace it. We've got `ncsi_pkg_info_nl` as one handler. Let's see what happens within that handler. The code calls `ndp_from_ifindex`, and it looks like it gets an `ifindex` from the netlink message's attributes. Now, `ndp_from_ifindex` gets the network device via `dev_get_by_index` and then calls `ncsi_find_dev`. The function `ncsi_find_dev` then searches `ncsi_dev_list`. If `ncsi_dev_list` is empty, `ncsi_find_dev` returns `NULL`. This means `ncsi_pkg_info_nl` will return `-ENODEV`, indicating "No such device". This could be why my fuzzer isn't able to control this interface. So, when does a device actually get added to `ncsi_dev_list`? Looking at the code, it's ONLY in `ncsi_register_dev()`. Then, where is `ncsi_register_dev()` called? Only in `ftgmac100_probe_ncsi()`. Wait a minute, is that the only place? Let me check every single file in the entire kernel tree. It has to be that, right? I've grepped the code before for `ncsi_register_dev` and the results indicated that it was only called in `ftgmac100.c`! Hmmm... could it be called by function pointer or some crazy macro? Time to grep again, this time looking for `register_dev` or similar across the whole tree to be sure. I need to be absolutely certain I'm not missing some subtle alternative path here.
38/2	2026/10/09 11:03	tool	grepper	0m Args: { "Expression": "register_dev" } Results: { "Output": "\nFull output is too long, showing 200 out of 21125 lines.\nUse more precise expression or PathPrefixes if possible.\n\nNumber of matching lines per file (1674 files in total):\nDocumentation/driver-api/driver-model/binding.rst:1\nDocumentation/driver-api/driver-model/devres.rst:2\nDocumentation/driver-api/media/v4l2-dev.rst:10\nDocumentation/driver-api/media/v4l2-device.rst:1\nDocumentation/driver-api/parport-lowlevel.rst:21\nDocumentation/driver-api/pm/cpuidle.rst:2\nDocumentation/driver-api/tty/tty_driver.rst:8\nDocumentation/hid/hidintro.rst:3\nDocumentation/i2c/instantiating-devices.rst:1\nDocumentation/i2c/writing-clients.rst:1\nDocumentation/infiniband/core_locking.rst:4\nDocumentation/input/input-programming.rst:5\nDocumentation/networking/ieee802154.rst:2\nDocumentation/translations/zh_CN/infiniband/core_locking.rst:4\nDocumentation/translations/zh_CN/video4linux/v4l2-framework.txt:9\nDocumentation/watchdog/convert_drivers_to_kernel_api.rst:4\nDocumentation/watchdog/watchdog-kernel-api.rst:11\narch/alpha/kernel/rtc.c:1\narch/arm/kernel/smp_twd.c:1\narch/arm/mach-omap1/board-ams-delta.c:1\narch/arm/mach-omap1/board-nokia770.c:1\narch/arm/mach-omap1/board-osk.c:1\narch/arm/mach-omap1/board-palmte.c:1\narch/arm/mach-omap1/board-sx1.c:1\narch/arm/mach-omap1/usb.c:2\narch/arm/mach-pxa/devices.c:9\narch/arm/mach-pxa/devices.h:1\narch/arm/mach-pxa/pxa27x.c:1\narch/arm/mach-s3c/mach-crag6410.c:1\narch/arm/mach-sa1100/assabet.c:1\narch/arm/mach-sa1100/generic.c:4\narch/arm64/kvm/vgic/vgic-its.c:2\narch/arm64/kvm/vgic/vgic-kvm-device.c:3\narch/arm64/kvm/vgic/vgic-mmio-v3.c:2\narch/arm64/kvm/vgic/vgic-mmio.c:1\narch/arm64/kvm/vgic/vgic-v2.c:1\narch/arm64/kvm/vgic/vgic-v3.c:1\narch/hexagon/kernel/time.c:2\narch/loongarch/kvm/intc/dmsintc.c:2\narch/loongarch/kvm/intc/eiointc.c:7\narch/loongarch/kvm/intc/ipi.c:4\narch/loongarch/kvm/intc/pch_pic.c:4\narch/m68k/coldfire/pit.c:1\narch/microblaze/kernel/timer.c:1\narch/mips/alchemy/board-mtx1.c:2\narch/mips/alchemy/common/time.c:1\narch/mips/ath25/devices.c:2\narch/mips/bcm47xx/leds.c:2\narch/mips/bcm63xx/boards/board_bcm963xx.c:1\narch/mips/bcm63xx/setup.c:3\n... and 1624 more files\n\nDocumentation/driver-api/driver-model/binding.rst=49=and actually register it with the class, which happens with the\nDocumentation/driver-api/driver-model/binding.rst:50:class's register_dev callback.\nDocumentation/driver-api/driver-model/binding.rst-51-\n--\nDocumentation/driver-api/driver-model/devres.rst=446=RTC\n--\nDocumentation/driver-api/driver-model/devres.rst-448- devm_rtc_allocate_device()\nDocumentation/driver-api/driver-model/devres.rst:449: devm_rtc_register_device()\nDocumentation/driver-api/driver-model/devres.rst-450- devm_rtc_nvmem_register()\n--\nDocumentation/driver-api/driver-model/devres.rst=466=WATCHDOG\nDocumentation/driver-api/driver-model/devres.rst:467: devm_watchdog_register_device()\nDocumentation/driver-api/driver-model/devres.rst-468-\n--\nDocumentation/driver-api/media/v4l2-dev.rst=106=your :c:type:`v4l2_ioctl_ops` should be ignored. You can mark such ioctls by\nDocumentation/driver-api/media/v4l2-dev.rst:107:calling this function before :c:func:`video_register_device` is called:\nDocumentation/driver-api/media/v4l2-dev.rst-108-\n--\nDocumentation/driver-api/media/v4l2-dev.rst=172=Video device registration\n--\nDocumentation/driver-api/media/v4l2-dev.rst-174-\nDocumentation/driver-api/media/v4l2-dev.rst:175:Next you register the video device with :c:func:`video_register_device`.\nDocumentation/driver-api/media/v4l2-dev.rst-176-This will create the character device for you.\n--\nDocumentation/driver-api/media/v4l2-dev.rst-179-\nDocumentation/driver-api/media/v4l2-dev.rst:180:\terr = video_register_device(vdev, VFL_TYPE_VIDEO, -1);\nDocumentation/driver-api/media/v4l2-dev.rst-181-\tif (err) {\n--\nDocumentation/driver-api/media/v4l2-dev.rst=210=the user to select a specific device node number through a driver module\nDocumentation/driver-api/media/v4l2-dev.rst:211:option. That number is then passed to this function and video_register_device\nDocumentation/driver-api/media/v4l2-dev.rst-212-will attempt to select that device node number. If that number was already\n--\nDocumentation/driver-api/media/v4l2-dev.rst=225=to select the specified device node number, you can call the function\nDocumentation/driver-api/media/v4l2-dev.rst:226::c:func:`video_register_device_no_warn` instead.\nDocumentation/driver-api/media/v4l2-dev.rst-227-\n--\nDocumentation/driver-api/media/v4l2-dev.rst=235=The 'index' attribute is the index of the device node: for each call to\nDocumentation/driver-api/media/v4l2-dev.rst:236::c:func:`video_register_device()` the index is just increased by 1. The\nDocumentation/driver-api/media/v4l2-dev.rst-237-first video device node you register always starts with index 0.\n--\nDocumentation/driver-api/media/v4l2-dev.rst=242=After the device was successfully registered, then you can use these fields:\n--\nDocumentation/driver-api/media/v4l2-dev.rst-244-- :c:type:`video_device`-\u003evfl_type: the device type passed to\nDocumentation/driver-api/media/v4l2-dev.rst:245: :c:func:`video_register_device`.\nDocumentation/driver-api/media/v4l2-dev.rst-246-- :c:type:`video_device`-\u003eminor: the assigned device minor number.\n--\nDocumentation/driver-api/media/v4l2-dev.rst=291=unregister them with:\nDocumentation/driver-api/media/v4l2-dev.rst-292-\nDocumentation/driver-api/media/v4l2-dev.rst:293:\t:c:func:`video_unregister_device`\nDocumentation/driver-api/media/v4l2-dev.rst-294-\t(:c:type:`vdev \u003cvideo_device\u003e`);\n--\nDocumentation/driver-api/media/v4l2-dev.rst=297=from ``/dev``).\nDocumentation/driver-api/media/v4l2-dev.rst-298-\nDocumentation/driver-api/media/v4l2-dev.rst:299:After :c:func:`video_unregister_device` returns no new opens can be done.\nDocumentation/driver-api/media/v4l2-dev.rst-300-However, in the case of USB devices some application might still have one of\n--\nDocumentation/driver-api/media/v4l2-dev.rst=331=Note that you can safely call :c:func:`video_set_drvdata` before calling\nDocumentation/driver-api/media/v4l2-dev.rst:332::c:func:`video_register_device`.\nDocumentation/driver-api/media/v4l2-dev.rst-333-\n--\nDocumentation/driver-api/media/v4l2-device.rst=121=purpose :c:type:`v4l2_device` has refcounting support. The refcount is\nDocumentation/driver-api/media/v4l2-device.rst:122:increased whenever :c:func:`video_register_device` is called and it is\nDocumentation/driver-api/media/v4l2-device.rst-123-decreased whenever that device node is released. When the refcount reaches\n--\nDocumentation/driver-api/parport-lowlevel.rst=9=Global functions::\n--\nDocumentation/driver-api/parport-lowlevel.rst-13- parport_enumerate\nDocumentation/driver-api/parport-lowlevel.rst:14: parport_register_device\nDocumentation/driver-api/parport-lowlevel.rst:15: parport_unregister_device\nDocumentation/driver-api/parport-lowlevel.rst-16- parport_claim\n--\nDocumentation/driver-api/parport-lowlevel.rst=204=EXAMPLE\n--\nDocumentation/driver-api/parport-lowlevel.rst-212-\t\tprivate = kmalloc (...);\nDocumentation/driver-api/parport-lowlevel.rst:213:\t\tdev[count++] = parport_register_device (...);\nDocumentation/driver-api/parport-lowlevel.rst-214-\t\t...\n--\nDocumentation/driver-api/parport-lowlevel.rst=240=SEE ALSO\n--\nDocumentation/driver-api/parport-lowlevel.rst-242-\nDocumentation/driver-api/parport-lowlevel.rst:243:parport_unregister_driver, parport_register_device, parport_enumerate\nDocumentation/driver-api/parport-lowlevel.rst-244-\n--\nDocumentation/driver-api/parport-lowlevel.rst=269=ports going away. Registered devices belonging to that driver are NOT\nDocumentation/driver-api/parport-lowlevel.rst:270:unregistered: parport_unregister_device must be used for each one.\nDocumentation/driver-api/parport-lowlevel.rst-271-\nDocumentation/driver-api/parport-lowlevel.rst=272=EXAMPLE\n--\nDocumentation/driver-api/parport-lowlevel.rst-284-\t\tfor (i = 0; i \u003c NUM_DEVS; i++)\nDocumentation/driver-api/parport-lowlevel.rst:285:\t\t\tparport_unregister_device (dev[i]);\nDocumentation/driver-api/parport-lowlevel.rst-286-\t\t...\n--\nDocumentation/driver-api/parport-lowlevel.rst=358=parport_register_driver, parport_unregister_driver\n--\nDocumentation/driver-api/parport-lowlevel.rst-361-\nDocumentation/driver-api/parport-lowlevel.rst:362:parport_register_device - register to use a port\nDocumentation/driver-api/parport-lowlevel.rst-363-------------------------------------------------\n--\nDocumentation/driver-api/parport-lowlevel.rst=365=SYNOPSIS\n--\nDocumentation/driver-api/parport-lowlevel.rst-375-\nDocumentation/driver-api/parport-lowlevel.rst:376:\tstruct pardevice parport_register_device(struct parport port,\nDocumentation/driver-api/parport-lowlevel.rst-377-\t\t\t\t\t\t const char name,\n--\nDocumentation/driver-api/parport-lowlevel.rst=392=filesystem. The string must be valid for the whole lifetime of the\nDocumentation/driver-api/parport-lowlevel.rst:393:device (until parport_unregister_device is called).\nDocumentation/driver-api/parport-lowlevel.rst-394-\n--\nDocumentation/driver-api/parport-lowlevel.rst=450=EXAMPLE\n--\nDocumentation/driver-api/parport-lowlevel.rst-475-\t{\nDocumentation/driver-api/parport-lowlevel.rst:476:\t\tprivate-\u003edev = parport_register_device (port, \"toaster\", preempt,\nDocumentation/driver-api/parport-lowlevel.rst-477-\t\t\t\t\t\t\twakeup, NULL, 0,\n--\nDocumentation/driver-api/parport-lowlevel.rst=498=SEE ALSO\n--\nDocumentation/driver-api/parport-lowlevel.rst-500-\nDocumentation/driver-api/parport-lowlevel.rst:501:parport_unregister_device, parport_claim\nDocumentation/driver-api/parport-lowlevel.rst-502-\n--\nDocumentation/driver-api/parport-lowlevel.rst-504-\f\nDocumentation/driver-api/parport-lowlevel.rst:505:parport_unregister_device - finish using a port\nDocumentation/driver-api/parport-lowlevel.rst-506------------------------------------------------\n--\nDocumentation/driver-api/parport-lowlevel.rst=508=SYNPOPSIS\n--\nDocumentation/driver-api/parport-lowlevel.rst-513-\nDocumentation/driver-api/parport-lowlevel.rst:514:\tvoid parport_unregister_device (struct pardevice dev);\nDocumentation/driver-api/parport-lowlevel.rst-515-\nDocumentation/driver-api/parport-lowlevel.rst=516=DESCRIPTION\n--\nDocumentation/driver-api/parport-lowlevel.rst-518-\nDocumentation/driver-api/parport-lowlevel.rst:519:This function is the opposite of parport_register_device. After using\nDocumentation/driver-api/parport-lowlevel.rst:520:parport_unregister_device, ``dev`` is no longer a valid device handle.\nDocumentation/driver-api/parport-lowlevel.rst-521-\n--\nDocumentation/driver-api/parport-lowlevel.rst=525=EXAMPLE\n--\nDocumentation/driver-api/parport-lowlevel.rst-531-\tkfree (dev-\u003eprivate); /* before we lose the pointer /\nDocumentation/driver-api/parport-lowlevel.rst:532:\tparport_unregister_device (dev);\nDocumentation/driver-api/parport-lowlevel.rst-533-\t...\n--\nDocumentation/driver-api/parport-lowlevel.rst=884=DESCRIPTION\n--\nDocumentation/driver-api/parport-lowlevel.rst-886-\nDocumentation/driver-api/parport-lowlevel.rst:887:This is like parport_register_device but takes a device number instead\nDocumentation/driver-api/parport-lowlevel.rst-888-of a pointer to a struct parport.\n--\nDocumentation/driver-api/parport-lowlevel.rst=890=RETURN VALUE\n--\nDocumentation/driver-api/parport-lowlevel.rst-892-\nDocumentation/driver-api/parport-lowlevel.rst:893:See parport_register_device. If no device is associated with devnum,\nDocumentation/driver-api/parport-lowlevel.rst-894-NULL is returned.\n--\nDocumentation/driver-api/parport-lowlevel.rst=896=SEE ALSO\n--\nDocumentation/driver-api/parport-lowlevel.rst-898-\nDocumentation/driver-api/parport-lowlevel.rst:899:parport_register_device\nDocumentation/driver-api/parport-lowlevel.rst-900-\n--\nDocumentation/driver-api/parport-lowlevel.rst=915=DESCRIPTION\n--\nDocumentation/driver-api/parport-lowlevel.rst-917-\nDocumentation/driver-api/parport-lowlevel.rst:918:This is the equivalent of parport_unregister_device for parport_open.\nDocumentation/driver-api/parport-lowlevel.rst-919-\nDocumentation/driver-api/parport-lowlevel.rst=920=SEE ALSO\n--\nDocumentation/driver-api/parport-lowlevel.rst-922-\nDocumentation/driver-api/parport-lowlevel.rst:923:parport_unregister_device, parport_open\nDocumentation/driver-api/parport-lowlevel.rst-924-\n--\nDocumentation/driver-api/pm/cpuidle.rst=244=all of the logical CPUs to be handled by the given ``CPUIdle`` driver with the\nDocumentation/driver-api/pm/cpuidle.rst:245:help of :c:func:`cpuidle_register_device()` after the driver has been registered\nDocumentation/driver-api/pm/cpuidle.rst-246-and :c:func:`cpuidle_register_driver()`, unlike :c:func:`cpuidle_register()`,\n--\nDocumentation/driver-api/pm/cpuidle.rst=261=struct cpuidle_device objects representing CPUs handled by the given\nDocumentation/driver-api/pm/cpuidle.rst-262-``CPUIdle`` driver must be unregistered, with the help of\nDocumentation/driver-api/pm/cpuidle.rst:263::c:func:`cpuidle_unregister_device()`, before calling\nDocumentation/driver-api/pm/cpuidle.rst-264-:c:func:`cpuidle_unregister_driver()` to unregister the driver. Alternatively,\n--\nDocumentation/driver-api/tty/tty_driver.rst=67=TTY driver is supposed to register every device discovered in the system\nDocumentation/driver-api/tty/tty_driver.rst:68:(the latter is preferred). This is performed by tty_register_device(). Or by\nDocumentation/driver-api/tty/tty_driver.rst:69:tty_register_device_attr() if the driver wants to expose some information\nDocumentation/driver-api/tty/tty_driver.rst-70-through struct attribute_group. Both of them register ``index``'th device and\n--\nDocumentation/driver-api/tty/tty_driver.rst=80=The registration routines are documented as follows:\n--\nDocumentation/driver-api/tty/tty_driver.rst-82-.. kernel-doc:: drivers/tty/tty_io.c\nDocumentation/driver-api/tty/tty_driver.rst:83: :identifiers: tty_register_device tty_register_device_attr\nDocumentation/driver-api/tty/tty_driver.rst:84: tty_unregister_device\nDocumentation/driver-api/tty/tty_driver.rst-85-\n--\nDocumentation/driver-api/tty/tty_driver.rst=92=at latest. There are few helpers to link* the two. Ideally, the driver uses\nDocumentation/driver-api/tty/tty_driver.rst:93:tty_port_register_device() or tty_port_register_device_attr() instead of\nDocumentation/driver-api/tty/tty_driver.rst:94:tty_register_device() and tty_register_device_attr() at the registration time.\nDocumentation/driver-api/tty/tty_driver.rst-95-This way, the driver needs not care about linking later on.\n--\nDocumentation/driver-api/tty/tty_driver.rst=104=The linking routines are documented here:\n--\nDocumentation/driver-api/tty/tty_driver.rst-106-.. kernel-doc:: drivers/tty/tty_port.c\n\n" }
39/2	2026/10/09 11:03	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 49089 output: 19 thoughts: 46 Thoughts: Okay, let's see. My first instinct here is to delve into the `net/ncsi/` directory. I want to understand the current landscape of NCSI implementation. But, my immediate thought is whether there are other network devices, beyond the obvious, potentially leveraging NCSI. So, I need to expand my search. The quickest way to do this is to jump into the `include/net/ncsi.h` file. That should give me the core definitions. My plan is to grep across the entire kernel source, looking for instances of that header file and related NCSI calls, definitions, or structures. That will allow me to comprehensively map NCSI usage throughout the code base.
40/2	2026/10/09 11:03	tool	grepper	0m Args: { "Expression": "ncsi\\.h" } Results: { "Output": "drivers/net/ethernet/faraday/ftgmac100.c-29-#include \u003cnet/ip.h\u003e\ndrivers/net/ethernet/faraday/ftgmac100.c:30:#include \u003cnet/ncsi.h\u003e\ndrivers/net/ethernet/faraday/ftgmac100.c-31-\n--\nnet/ncsi/ncsi-aen.c-11-\nnet/ncsi/ncsi-aen.c:12:#include \u003cnet/ncsi.h\u003e\nnet/ncsi/ncsi-aen.c-13-#include \u003cnet/net_namespace.h\u003e\n--\nnet/ncsi/ncsi-cmd.c-12-\nnet/ncsi/ncsi-cmd.c:13:#include \u003cnet/ncsi.h\u003e\nnet/ncsi/ncsi-cmd.c-14-#include \u003cnet/net_namespace.h\u003e\n--\nnet/ncsi/ncsi-manage.c-14-\nnet/ncsi/ncsi-manage.c:15:#include \u003cnet/ncsi.h\u003e\nnet/ncsi/ncsi-manage.c-16-#include \u003cnet/net_namespace.h\u003e\n--\nnet/ncsi/ncsi-netlink.c-11-#include \u003cnet/genetlink.h\u003e\nnet/ncsi/ncsi-netlink.c:12:#include \u003cnet/ncsi.h\u003e\nnet/ncsi/ncsi-netlink.c-13-#include \u003clinux/skbuff.h\u003e\nnet/ncsi/ncsi-netlink.c-14-#include \u003cnet/sock.h\u003e\nnet/ncsi/ncsi-netlink.c:15:#include \u003cuapi/linux/ncsi.h\u003e\nnet/ncsi/ncsi-netlink.c-16-\n--\nnet/ncsi/ncsi-rsp.c-12-\nnet/ncsi/ncsi-rsp.c:13:#include \u003cnet/ncsi.h\u003e\nnet/ncsi/ncsi-rsp.c-14-#include \u003cnet/net_namespace.h\u003e\n" }
41/2	2026/10/09 11:04	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 49873 output: 26 thoughts: 4022 Thoughts: Analysis of NCSI Reachability in amd64 Environment Okay, here's the breakdown of my thought process. I'm starting with a very specific question: can this NCSI code be reached on amd64, given the constraints? The code has been changed. I need to figure out if that changed code could be hit. First, the key point: `ncsi.h` is only included in `ftgmac100.c` and `net/ncsi/`, nowhere else. So, I need to understand the reachability of these. Now, `ftgmac100` depends on `ARM \|\| COMPILE_TEST` AND `!64BIT \|\| BROKEN`. Since I'm targeting amd64 (64BIT), this means `ftgmac100` requires* `BROKEN`. Even with `CONFIG_BROKEN=y`, this is a platform driver for Aspeed BMC SoC hardware, which QEMU x86_64 doesn't emulate. The Aspeed AST2400/2500/2600 is an ARM-based BMC SoC, which means it will never be available on my architecture in standard QEMU. So the "structurally unreachable hardware" criteria seem to apply here. Okay, let's explore `net/ncsi` by itself. Could that somehow be triggered via netlink without an actual `ftgmac100` probe? My focus is on the netlink handlers: `ncsi_pkg_info_nl`, `ncsi_set_interface_nl`, `ncsi_clear_interface_nl`, etc. Crucially, all these handlers call `ndp_from_ifindex`. That means if a "normal" network device wasn't there (which the `ftgmac100` driver would add), it would return `-ENODEV`, indicating the device isn't available. I went through the code to verify this logic. Every single netlink handler checks for a valid `ndp` after calling `ndp_from_ifindex`. If `ndp` is `NULL` (because no NCSI device is registered), the code immediately returns `-ENODEV`. The main point is that all of the operations: * `ncsi_write_package_info` * `ncsi_write_channel_info` * `ncsi_reset_dev` * `ncsi_kick_channels` * `ncsi_stop_channel_monitor` * `ncsi_process_next_channel` * `ncsi-aen.c` * `ncsi_unregister_dev_prepare` * `ncsi_unregister_dev` * `ncsi_vlan_rx_add_vid` (called only by `ftgmac100_netdev_ops.ndo_vlan_rx_add_vid`) * `ncsi_vlan_rx_kill_vid` (called only by `ftgmac100_netdev_ops.ndo_vlan_rx_kill_vid`) Those code segments cannot be reached if a `net_device` hasn't been instantiated via the `ftgmac100` driver. So the next question is if any other device, a virtual network device or any other kind, could register an NCSI device. `ncsi_register_dev` is called only by `ftgmac100_probe_ncsi`, which is called only within `ftgmac100_probe_dt`, which is called inside `ftgmac100_probe`, which is the `.probe` function for `ftgmac100_driver`. The device does not appear in any other driver, and it cannot be registered by any other net device. I confirmed this by searching the entire kernel source and found no other calls to `ncsi_register_dev`. Finally, checking the VLAN handler calls. Even these VLAN functions are used only by `ftgmac100`. And that `ftgmac100` driver is NOT reachable. Therefore, the modified code is unreachable on amd64 in a standard QEMU environment. This means this is an unreachable execution path exclusive to other architectures, specifically ARM-based BMCs. Thus, `WorthFuzzing` should be `false`.
42/2	2026/10/09 11:04	tool	grepper	0m Args: { "Expression": "ncsi_vlan_rx_add_vid" } Results: { "Output": "drivers/net/ethernet/faraday/ftgmac100.c=1717=static const struct net_device_ops ftgmac100_netdev_ops = {\n--\ndrivers/net/ethernet/faraday/ftgmac100.c-1729-#endif\ndrivers/net/ethernet/faraday/ftgmac100.c:1730:\t.ndo_vlan_rx_add_vid\t= ncsi_vlan_rx_add_vid,\ndrivers/net/ethernet/faraday/ftgmac100.c-1731-\t.ndo_vlan_rx_kill_vid\t= ncsi_vlan_rx_kill_vid,\n--\ninclude/net/ncsi.h=26=struct ncsi_dev {\n--\ninclude/net/ncsi.h-33-#ifdef CONFIG_NET_NCSI\ninclude/net/ncsi.h:34:int ncsi_vlan_rx_add_vid(struct net_device dev, __be16 proto, u16 vid);\ninclude/net/ncsi.h-35-int ncsi_vlan_rx_kill_vid(struct net_device dev, __be16 proto, u16 vid);\n--\ninclude/net/ncsi.h=45=void ncsi_unregister_dev(struct ncsi_dev nd);\ninclude/net/ncsi.h-46-#else / !CONFIG_NET_NCSI /\ninclude/net/ncsi.h:47:static inline int ncsi_vlan_rx_add_vid(struct net_device dev, __be16 proto, u16 vid)\ninclude/net/ncsi.h-48-{\n--\nnet/ncsi/ncsi-manage.c=1628=static int ncsi_kick_channels(struct ncsi_dev_priv ndp)\n--\nnet/ncsi/ncsi-manage.c-1719-\nnet/ncsi/ncsi-manage.c:1720:int ncsi_vlan_rx_add_vid(struct net_device dev, __be16 proto, u16 vid)\nnet/ncsi/ncsi-manage.c-1721-{\n--\nnet/ncsi/ncsi-manage.c-1783-}\nnet/ncsi/ncsi-manage.c:1784:EXPORT_SYMBOL_GPL(ncsi_vlan_rx_add_vid);\nnet/ncsi/ncsi-manage.c-1785-\n" }
43/2	2026/10/09 11:04	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 55576 output: 21 thoughts: 54 Thoughts: Okay, here's my take on those thoughts, framed as an expert's internal monologue: Focusing on NCSI VLAN Handling Alright, so `ncsi_vlan_rx_add_vid`... that's the key function for NCSI VLAN reception, isn't it? The immediate thing that jumps out is that the code only references it within `ftgmac100.c`. Hmm, that's interesting. Usually, you'd expect something like this to have a broader impact, but it looks very localized to this specific driver. Okay, that helps narrow things down considerably. Now, let's drill down a bit further to see how it might be interacting, especially related to start and stop sequences. I'm going to look at how `ncsi_start_dev` and `ncsi_stop_dev` handle the NCSI functionality. Are VLAN IDs added during the start process, and removed on stop, or is it handled another way? Understanding the lifecycle will be key to pinpointing the actual implementation logic. This narrows it down.
44/2	2026/10/09 11:04	tool	grepper	0m Args: { "Expression": "ncsi_start_dev" } Results: { "Output": "drivers/net/ethernet/faraday/ftgmac100.c=1561=static int ftgmac100_open(struct net_device netdev)\n--\ndrivers/net/ethernet/faraday/ftgmac100.c-1617-\t\t/ Start the NCSI device /\ndrivers/net/ethernet/faraday/ftgmac100.c:1618:\t\terr = ncsi_start_dev(priv-\u003endev);\ndrivers/net/ethernet/faraday/ftgmac100.c-1619-\t\tif (err)\n--\ninclude/net/ncsi.h=36=struct ncsi_dev ncsi_register_dev(struct net_device dev,\ninclude/net/ncsi.h-37-\t\t\t\t void (notifier)(struct ncsi_dev nd));\ninclude/net/ncsi.h:38:int ncsi_start_dev(struct ncsi_dev nd);\ninclude/net/ncsi.h-39-void ncsi_stop_dev(struct ncsi_dev nd);\n--\ninclude/net/ncsi.h=57=static inline struct ncsi_dev ncsi_register_dev(struct net_device dev,\n--\ninclude/net/ncsi.h-62-\ninclude/net/ncsi.h:63:static inline int ncsi_start_dev(struct ncsi_dev nd)\ninclude/net/ncsi.h-64-{\n--\nnet/ncsi/ncsi-manage.c=1905=EXPORT_SYMBOL_GPL(ncsi_register_dev);\nnet/ncsi/ncsi-manage.c-1906-\nnet/ncsi/ncsi-manage.c:1907:int ncsi_start_dev(struct ncsi_dev nd)\nnet/ncsi/ncsi-manage.c-1908-{\n--\nnet/ncsi/ncsi-manage.c-1924-}\nnet/ncsi/ncsi-manage.c:1925:EXPORT_SYMBOL_GPL(ncsi_start_dev);\nnet/ncsi/ncsi-manage.c-1926-\nnet/ncsi/ncsi-manage.c=1927=void ncsi_stop_dev(struct ncsi_dev nd)\n--\nnet/ncsi/ncsi-manage.c-1936-\t/* Stop the channel monitor on any active channels. Don't reset the\nnet/ncsi/ncsi-manage.c:1937:\t * channel state so we know which were active when ncsi_start_dev()\nnet/ncsi/ncsi-manage.c-1938-\t * is next called.\n" }
45/2	2026/10/09 11:04	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 56615 output: 32 thoughts: 45 Thoughts: Here's my thought process, as if I were considering this issue: NCSI Packet Reception Deep Dive Okay, so I need to get a handle on how packet reception is working within NCSI. My immediate thought is, "How does packet reception happen in NCSI?" I'm going to start by looking into the kernel code to understand the mechanisms involved. Time to go right to the relevant networking files. Specifically, I'll need to check the `net/ncsi` directory and hone in on potential functions and data structures that handle incoming packets, I'll start with something like `dev_add_pack` or `ptype`, because they usually handle incoming network traffic. I should see if NCSI is using one of them.
46/2	2026/10/09 11:04	tool	grepper	0m Args: { "Expression": "dev_add_pack", "PathPrefixes": [ "net/ncsi/" ] } Results: { "Output": "net/ncsi/ncsi-manage.c=1836=struct ncsi_dev ncsi_register_dev(struct net_device dev,\n--\nnet/ncsi/ncsi-manage.c-1891-\tndp-\u003eptype.dev = dev;\nnet/ncsi/ncsi-manage.c:1892:\tdev_add_pack(\u0026ndp-\u003eptype);\nnet/ncsi/ncsi-manage.c-1893-\n" }
47/2	2026/10/09 11:04	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 56992 output: 47 thoughts: 5092 Thoughts: Summary of Analysis: NCSI Reachability on amd64 in Syzkaller Alright, let's break this down. My initial thought was, "Hey, `dev_add_pack` and `ncsi_rcv_rsp` – seems like NCSI packet reception is tied to registration with `ncsi_register_dev`." Then the question popped: "Can anything else register an NCSI device?" I immediately went to check `ncsi-netlink.c`, since that's a prime suspect for a userspace interface, and it seems like the only user space interface. I then confirmed that the netlink commands listed only operate on existing NCSI devices. They all use `ndp_from_ifindex`, which relies on the `ncsi_dev_list` to find the device. Without `ncsi_register_dev`, `ndp` will always be NULL, leading to an `-ENODEV` error. I double-checked – is there any other path to populate `ncsi_dev_list` besides `ncsi_register_dev`? The answer, as I verified by searching the entire kernel, is a resounding NO. My next step was to examine the "Reachability" section of the prompt. The crucial question is, can `ftgmac100` – the only driver that calls `ncsi_register_dev` – even run on amd64 in a standard QEMU environment? I reviewed the Kconfig and dependencies. `FTGMAC100` requires `ARM \|\| COMPILE_TEST` AND `!64BIT \|\| BROKEN`. Given that the target is amd64, we're 64-bit, so `!64BIT` is false. Therefore, to compile `FTGMAC100` on amd64, you'd need `COMPILE_TEST=y` and `BROKEN=y`. But even if compiled, it's an ARM SoC platform driver for Faraday/Aspeed AST2400/2500/2600. QEMU does not emulate these platforms on amd64. These models only exist in `qemu-system-arm`. However, the prompt's focus on modified code made me re-examine the patch's impact on NCSI code, and I re-confirmed that `CONFIG_NET_NCSI` can be enabled on amd64. I traced `ncsi_init_netlink`, which registers the `ncsi_genl_family`, and `syzkaller` on amd64 can send messages to that family. That raised a flag: are those netlink commands in `ncsi-netlink.c` reachable? I looked at the code paths of the netlink handlers: `ncsi_pkg_info_nl`, `ncsi_pkg_info_all_nl`, `ncsi_set_interface_nl`, `ncsi_clear_interface_nl`, `ncsi_send_cmd_nl`, `ncsi_set_package_mask_nl`, and `ncsi_set_channel_mask_nl`. Each one calls `ndp_from_ifindex` after checking for a valid interface. I verified the key point: even if valid `NCSI_ATTR_IFINDEX` is provided, `ndp_from_ifindex` calls `ncsi_find_dev`. And since no device has been registered, `ncsi_find_dev` returns NULL. The netlink handlers then return `-ENODEV`. I then went over every single line of code modified in the patch, double-checking for reachability. I checked if other functions in: - `ftgmac100.c` - `ncsi-aen.c` - `ncsi-manage.c` (except for `ncsi_find_dev`) - `ncsi_write_package_info` - `ncsi_send_netlink_timeout` could ever execute. The most important of which is to check: 1. Is it called in boot / initcall? 2. Is it called by any virtual network device driver? 3. Is it called by ANY driver that can exist in amd64 QEMU? 4. Can `ftgmac100` be loaded and probed on amd64 in QEMU? So, while the netlink entry points are technically reachable, the core NCSI functionality tied to `ftgmac100` is not. The
48/2	2026/10/09 11:05	tool	read-file	0m Args: { "File": "drivers/net/ethernet/faraday/ftgmac100.c", "FirstLine": 2045, "LineCount": 45 } Results: { "Contents": "2045:\t\t\terr = PTR_ERR(priv-\u003erst);\n2046:\t\t\tgoto err;\n2047:\t\t}\n2048:\t\n2049:\t\tif (priv-\u003eis_aspeed) {\n2050:\t\t\terr = ftgmac100_setup_clk(priv);\n2051:\t\t\tif (err)\n2052:\t\t\t\tgoto err;\n2053:\t\t}\n2054:\t\n2055:\t\t/* Disable ast2600 problematic HW arbitration /\n2056:\t\tif (priv-\u003emac_id == FTGMAC100_AST2600)\n2057:\t\t\tiowrite32(FTGMAC100_TM_DEFAULT,\n2058:\t\t\t\t priv-\u003ebase + FTGMAC100_OFFSET_TM);\n2059:\t\n2060:\t\t/ Default ring sizes /\n2061:\t\tpriv-\u003erx_q_entries = priv-\u003enew_rx_q_entries = DEF_RX_QUEUE_ENTRIES;\n2062:\t\tpriv-\u003etx_q_entries = priv-\u003enew_tx_q_entries = DEF_TX_QUEUE_ENTRIES;\n2063:\t\n2064:\t\t/ Base feature set /\n2065:\t\tnetdev-\u003ehw_features = NETIF_F_RXCSUM \| NETIF_F_HW_CSUM \|\n2066:\t\t\tNETIF_F_GRO \| NETIF_F_SG \| NETIF_F_HW_VLAN_CTAG_RX \|\n2067:\t\t\tNETIF_F_HW_VLAN_CTAG_TX;\n2068:\t\n2069:\t\tif (priv-\u003euse_ncsi)\n2070:\t\t\tnetdev-\u003ehw_features \|= NETIF_F_HW_VLAN_CTAG_FILTER;\n2071:\t\n2072:\t\t/ AST2400 doesn't have working HW checksum generation /\n2073:\t\tif (priv-\u003emac_id == FTGMAC100_AST2400)\n2074:\t\t\tnetdev-\u003ehw_features \u0026= ~NETIF_F_HW_CSUM;\n2075:\t\n2076:\t\t/ AST2600 tx checksum with NCSI is broken /\n2077:\t\tif (priv-\u003euse_ncsi \u0026\u0026 priv-\u003emac_id == FTGMAC100_AST2600)\n2078:\t\t\tnetdev-\u003ehw_features \u0026= ~NETIF_F_HW_CSUM;\n2079:\t\n2080:\t\tif (np \u0026\u0026 of_get_property(np, \"no-hw-checksum\", NULL))\n2081:\t\t\tnetdev-\u003ehw_features \u0026= ~(NETIF_F_HW_CSUM \| NETIF_F_RXCSUM);\n2082:\t\tnetdev-\u003efeatures \|= netdev-\u003ehw_features;\n2083:\t\n2084:\t\t/ register network device */\n2085:\t\terr = register_netdev(netdev);\n2086:\t\tif (err) {\n2087:\t\t\tdev_err(\u0026pdev-\u003edev, \"Failed to register netdev\\n\");\n2088:\t\t\tgoto err;\n2089:\t\t}\n" }
49/2	2026/10/09 11:05	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 63980 output: 49 thoughts: 30 Thoughts: Okay, here's my take on those thoughts, tailored for an expert audience: Analyzing the Call Stack of `ftgmac100_probe_dt` Alright, let's dive in. I need to understand the control flow surrounding `ftgmac100_probe_dt`. The key question is, where in the `ftgmac100_probe` function is this device tree probing routine actually invoked? I'm thinking I need to trace the call paths to get the bigger picture. I'm guessing this function is central to my diagnostic efforts, and that figuring out where the call is being made is going to give me some valuable insight.
50/2	2026/10/09 11:05	tool	grepper	0m Args: { "Expression": "ftgmac100_probe_dt", "PathPrefixes": [ "drivers/net/ethernet/faraday/ftgmac100.c" ] } Results: { "Output": "drivers/net/ethernet/faraday/ftgmac100.c=1848=static int ftgmac100_probe_ncsi(struct net_device netdev,\n--\ndrivers/net/ethernet/faraday/ftgmac100.c-1889-\ndrivers/net/ethernet/faraday/ftgmac100.c:1890:static int ftgmac100_probe_dt(struct net_device netdev,\ndrivers/net/ethernet/faraday/ftgmac100.c-1891-\t\t\t struct platform_device pdev,\n--\ndrivers/net/ethernet/faraday/ftgmac100.c=1942=static int ftgmac100_probe(struct platform_device pdev)\n--\ndrivers/net/ethernet/faraday/ftgmac100.c-2037-\tif (np) {\ndrivers/net/ethernet/faraday/ftgmac100.c:2038:\t\terr = ftgmac100_probe_dt(netdev, pdev, priv, np);\ndrivers/net/ethernet/faraday/ftgmac100.c-2039-\t\tif (err)\n" }
51/2	2026/10/09 11:05	llm	patch-evaluator	1m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 64531 output: 33 thoughts: 7062 Thoughts: NCSI Code Path Analysis for amd64 Architecture Okay, so here's the deal, after some serious deep diving. I'm looking at this patch and trying to figure out if it's worth fuzzing on an amd64 system, and my expert intuition is screaming "no." The core issue is that this NCSI (Network Controller Sideband Interface) code is fundamentally tied to a specific hardware architecture that isn't found in standard QEMU environments on amd64: ARM BMCs. Let's break it down: The relevant functions and data structures rely entirely on the Faraday ftgmac100 driver. This driver is designed for Aspeed BMC chips, which are ARM-based. The code has a clear architecture dependency (`ARM \|\| COMPILE_TEST`) and it is designed for a system with 32-bit architecture (`!64BIT \|\| BROKEN`). On amd64, the ftgmac100 driver cannot even be enabled, since these chips are not emulated in standard QEMU amd64 instances. So, even if we were to compile it as a test, it still would not probe successfully because the platform is designed to be an Open Firmware Device Tree platform device, and there are no Aspeed or Faraday mac nodes in QEMU. This means that none of the core logic, or NCSI, would ever run because no NCSI device would ever be registered. This also means no netlink message for any interface will work. Because of the architectural constraint, everything downstream of the `ftgmac100_probe_dt` function calls, which are the fundamental drivers for NCSI, will not be registered on the amd64 system. What I'm seeing is a situation where the patch touches code that looks like it's part of the networking stack in the "net/" directory, but it's actually completely isolated to the Aspeed BMC/ARM ecosystem and is not part of the core network stack. The fuzzing goal is to find crashes in executable code. The modified code is structurally unreachable. Therefore, based on the principle of REACHABILITY, which is the key criteria: since the modified code is structurally unreachable (on an amd64 system), it MUST NOT be fuzzed, regardless of how complex the locking or synchronization logic. All the added locking, all the RCU-related additions, all the VLAN stuff – it's all dead code on amd64. The only thing that will ever be executed is that `-ENODEV` return. There is a `ncsi_dev_mutex` and `rcu_read_lock` protecting an empty list, and the code returns before anything else can happen. I'm essentially locking and unlocking an empty door! Even if we were to send netlink messages and somehow trigger `ncsi_set_interface_nl`, or any other handler, we'd hit that `ndp_from_ifindex` function and it would return `NULL` and `-ENODEV` without ever registering an NCSI device. None of the modified synchronization logic can ever execute with standard syzkaller netlink messages on the target architecture. This code is exclusive to the ARM architecture and structurally unreachable on amd64. Therefore, worth fuzzing is `false` because the patch falls into the "Unreachable execution paths: Code paths exclusive to architectures other than the target architecture."
52/2	2026/10/09 11:06	tool	grepper	0m Error: no matches Args: { "Expression": "rtnl_link_ops", "PathPrefixes": [ "net/ncsi/" ] } Results: { "error": "no matches" }
53/2	2026/10/09 11:06	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 72358 output: 280 thoughts: 1798 Thoughts: NCSI Unreachability on amd64: A Detailed Analysis Okay, so looking at this NCSI stuff, it's pretty clear where we stand. There's no `rtnl_link_ops` in `net/ncsi/`, which immediately throws up a flag. Let's dig in and see what's actually using this. A quick grep of the kernel source tree for `ncsi` related items reveals that it's just the `ftgmac100` driver and the `net/ncsi/` directory. No surprises there. So, the conclusion is that an NCSI device cannot exist on amd64 in a standard virtualized environment like QEMU or GCE. Why? Because the only driver that supports NCSI is `ftgmac100`, and that's an ARM SoC driver specifically for Aspeed hardware, which just isn't present or emulated on amd64. Now, let's go back and carefully re-read those triage instructions. The primary gate is reachability. We can only discover bugs in code that actually executes in a standard virtualized environment. The instructions explicitly state that if the modified code is structurally unreachable, we should not fuzz it. The instructions are clear: unreachable hardware, like vendor-specific hardware or drivers requiring specific hardware not emulated in standard QEMU. Also, code paths that are exclusive to different architectures. It is explicitly mentioned that code paths exclusive to architectures other than the target architecture is a negative criteria. 1. `drivers/net/ethernet/faraday/ftgmac100.c` is an Ethernet MAC driver specifically for ARM Aspeed AST2400/2500/2600 BMC SoCs and Faraday A320/A369 SoCs. This driver is dependent on `ARM \|\| COMPILE_TEST` and `!64BIT \|\| BROKEN`. It can't even be selected on amd64 without `CONFIG_BROKEN=y`, and even then, the hardware isn't emulated in QEMU. 2. `net/ncsi/` implements the Network Controller Sideband Interface (NC-SI) protocol stack. The only driver that ever registers an NC-SI device is `ftgmac100.c`, which makes it the sole user of `ncsi_register_dev()`. 3. Because no NC-SI device can exist on amd64, all the actual functional NC-SI logic—channel management, AEN handlers, state transitions, packet handling, VLAN filtering, and teardown—is completely unreachable. 4. Even though the `NCSI` netlink family might receive messages from userspace if `CONFIG_NET_NCSI` is enabled, all those handler entry points immediately return `-ENODEV` because `ncsi_find_dev()` finds no registered NC-SI device. Nothing past the device lookup can ever execute. Therefore, this code is structurally unreachable on amd64. Okay, is there even a remote argument against this? Someone could argue that the entry points for the modified netlink handlers are reachable. They're still called when userspace sends netlink messages. Does the fact that they take a mutex and immediately return `-ENODEV` mean it's worth fuzzing? Let's go back to the instructions. The goal is to discover crashes, regressions, exposed bugs, and new assertions introduced by the patch. But reachability is the gate. If the code is structurally unreachable, it MUST NOT be fuzzed, even if it adds assertions or complex logic. So, if syzkaller is fuzzing this on amd64, all it's going to do is: 1) look up ifindex, 2) check an empty list, and 3) return `-ENODEV`. Can it discover anything useful about the NCSI stack when the stack is completely inactive and has zero devices registered? No! None of the NCSI code—packages, channels, state machines, timers, workqueues, VLAN lists, RCU, locking hierarchy—will ever be exercised. This entire patch is a synchronization and lifecycle overhaul, but none of those structures or functions can be reached because no device can ever be registered on amd64. It's clear, this is not worth fuzzing. Let's do a final check: * Target architecture: amd64 * Modified files: * `drivers/net/ethernet/faraday/ftgmac100.c`: Unreachable. * `include/net/ncsi.h`, `net/ncsi/internal.h`, etc.: NC-SI subsystem. Only
54/2	2026/10/09 11:07	tool	set-results	0m Args: { "EnableConfigs": [], "FocusSymbols": [], "Reasoning": "The patch series modifies the NC-SI (Network Controller Sideband Interface) stack in net/ncsi/ and the Faraday FTGMAC100 Ethernet driver in drivers/net/ethernet/faraday/ftgmac100.c to improve locking and lifecycle synchronization. FTGMAC100 is an ARM-specific platform driver for Faraday and Aspeed AST2400/2500/2600 BMC SoCs, depending on (ARM \|\| COMPILE_TEST) \u0026\u0026 (!64BIT \|\| BROKEN), and cannot run on amd64 in standard QEMU/virtualized environments. FTGMAC100 is the sole caller of ncsi_register_dev() in the entire Linux kernel; no virtual or x86 device supports NC-SI. Consequently, no NC-SI device can ever be registered on amd64. While the generic netlink interface (NCSI family) is exposed if CONFIG_NET_NCSI is enabled, all netlink handlers immediately return -ENODEV during device lookup (ndp_from_ifindex), leaving all modified channel management, state machines, packet handling, and synchronization logic structurally unreachable.", "WorthFuzzing": false } Results: { "EnableConfigs": null, "FocusSymbols": [], "Reasoning": "The patch series modifies the NC-SI (Network Controller Sideband Interface) stack in net/ncsi/ and the Faraday FTGMAC100 Ethernet driver in drivers/net/ethernet/faraday/ftgmac100.c to improve locking and lifecycle synchronization. FTGMAC100 is an ARM-specific platform driver for Faraday and Aspeed AST2400/2500/2600 BMC SoCs, depending on (ARM \|\| COMPILE_TEST) \u0026\u0026 (!64BIT \|\| BROKEN), and cannot run on amd64 in standard QEMU/virtualized environments. FTGMAC100 is the sole caller of ncsi_register_dev() in the entire Linux kernel; no virtual or x86 device supports NC-SI. Consequently, no NC-SI device can ever be registered on amd64. While the generic netlink interface (NCSI family) is exposed if CONFIG_NET_NCSI is enabled, all netlink handlers immediately return -ENODEV during device lookup (ndp_from_ifindex), leaving all modified channel management, state machines, packet handling, and synchronization logic structurally unreachable.", "WorthFuzzing": false }
55/1	2026/10/09 11:07	action	If	0m Args: { "WorthFuzzing": false } Results: null

LLM Calls Summary:
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Tool Calls Summary:
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