AI Trajectory


Trajectory: (Expand/Collapse All)
Seq Timestamp Type Name Duration
0/0 2026/08/10 18:42 flow patch-triage
0m Args: 
null

Results: 
{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "KMSANReasoning": "",
  "NeedsKMSAN": false,
  "Reasoning": "The patch introduces a module parameter to allow selecting PM_MAX instead of PM_FAST for power management in the brcmfmac driver. This only changes a numeric constant sent to the device firmware and does not alter the execution flow or introduce complex logic in the kernel that would benefit from fuzzing. Furthermore, the driver requires specific Broadcom Wi-Fi hardware.",
  "WorthFuzzing": false
}
1/1 2026/08/10 18:42 action read-patch-diff
0m Args: 
null

Results: 
{
  "PatchDiff": "commit e2c4972e429a2867f3ec0f0ead8972d03b6457d0\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Mon Aug 10 18:42:15 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c\nindex 872c48806d091..5e5b8bac53dc2 100644\n--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c\n+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c\n@@ -3327,7 +3327,7 @@ brcmf_cfg80211_set_power_mgmt(struct wiphy *wiphy, struct net_device *ndev,\n \t\tgoto done;\n \t}\n \n-\tpm = enabled ? PM_FAST : PM_OFF;\n+\tpm = enabled ? ifp-\u003edrvr-\u003esettings-\u003edefault_pm : PM_OFF;\n \t/* Do not enable the power save after assoc if it is a p2p interface */\n \tif (ifp-\u003evif-\u003ewdev.iftype == NL80211_IFTYPE_P2P_CLIENT) {\n \t\tbrcmf_dbg(INFO, \"Do not enable power save for P2P clients\\n\");\n@@ -7821,7 +7821,7 @@ static s32 brcmf_config_dongle(struct brcmf_cfg80211_info *cfg)\n \n \tbrcmf_dongle_scantime(ifp);\n \n-\tpower_mode = cfg-\u003epwr_save ? PM_FAST : PM_OFF;\n+\tpower_mode = cfg-\u003epwr_save ? ifp-\u003edrvr-\u003esettings-\u003edefault_pm : PM_OFF;\n \terr = brcmf_fil_cmd_int_set(ifp, BRCMF_C_SET_PM, power_mode);\n \tif (err)\n \t\tgoto default_conf_out;\ndiff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.c\nindex b6027d83e6ab5..b2e06abc76f8a 100644\n--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.c\n+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.c\n@@ -20,6 +20,7 @@\n #include \"of.h\"\n #include \"firmware.h\"\n #include \"chip.h\"\n+#include \"defs.h\"\n \n MODULE_AUTHOR(\"Broadcom Corporation\");\n MODULE_DESCRIPTION(\"Broadcom 802.11 wireless LAN fullmac driver.\");\n@@ -67,6 +68,10 @@ static int brcmf_iapp_enable;\n module_param_named(iapp, brcmf_iapp_enable, int, 0);\n MODULE_PARM_DESC(iapp, \"Enable partial support for the obsoleted Inter-Access Point Protocol\");\n \n+static bool brcmf_max_pm;\n+module_param_named(max_pm, brcmf_max_pm, bool, 0400);\n+MODULE_PARM_DESC(max_pm, \"Use PM_MAX instead of PM_FAST for power management\");\n+\n #ifdef DEBUG\n /* always succeed brcmf_bus_started() */\n static int brcmf_ignore_probe_fail;\n@@ -530,6 +535,7 @@ struct brcmf_mp_device *brcmf_get_module_param(struct device *dev,\n \tsettings-\u003efcmode = brcmf_fcmode;\n \tsettings-\u003eroamoff = !!brcmf_roamoff;\n \tsettings-\u003eiapp = !!brcmf_iapp_enable;\n+\tsettings-\u003edefault_pm = brcmf_max_pm ? PM_MAX : PM_FAST;\n #ifdef DEBUG\n \tsettings-\u003eignore_probe_fail = !!brcmf_ignore_probe_fail;\n #endif\ndiff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.h b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.h\nindex 3bdb6984b2dd4..d06c734ea82a2 100644\n--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.h\n+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.h\n@@ -37,6 +37,7 @@ extern struct brcmf_mp_global_t brcmf_mp_global;\n  * @feature_disable: Feature_disable bitmask.\n  * @fcmode: FWS flow control.\n  * @roamoff: Firmware roaming off?\n+ * @default_pm: Default power-management mode.\n  * @ignore_probe_fail: Ignore probe failure.\n  * @trivial_ccode_map: Assume firmware uses ISO3166 country codes with rev 0\n  * @country_codes: If available, pointer to struct for translating country codes\n@@ -48,6 +49,7 @@ struct brcmf_mp_device {\n \tint\t\tfcmode;\n \tbool\t\troamoff;\n \tbool\t\tiapp;\n+\tint\t\tdefault_pm;\n \tbool\t\tignore_probe_fail;\n \tbool\t\ttrivial_ccode_map;\n \tstruct brcmfmac_pd_cc *country_codes;\n"
}
2/1 2026/08/10 18:42 agent patch-evaluator
0m Model: 
best-expensive

Args: 
null

Results: 
{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch introduces a module parameter to allow selecting PM_MAX instead of PM_FAST for power management in the brcmfmac driver. This only changes a numeric constant sent to the device firmware and does not alter the execution flow or introduce complex logic in the kernel that would benefit from fuzzing. Furthermore, the driver requires specific Broadcom Wi-Fi hardware.",
  "WorthFuzzing": false
}

Instruction: 
You are an expert Linux kernel maintainer.
Your job is to review a provided patch series and determine
if it makes functional changes to the kernel that should be fuzzed.

IMPORTANT: The changes have ALREADY been applied and committed as the HEAD commit in
your workspace. Do NOT rely on your internal knowledge of the kernel. You must actively
use your code access tools to examine the actual source code and confirm any assumptions.

Return WorthFuzzing=false if the patch only contains:
- Modifications to Documentation/, Kconfig files, or code comments.
- Purely decorative changes, such as logging (e.g., pr_err, printk) or tracepoints.
- Changes to numeric constants or macros that do not functionally alter execution flow.
- Code paths that are impossible to reach in virtualized environments like GCE or QEMU,
  even when utilizing software-emulated hardware (e.g., usb gadget, mac80211_hwsim).
- Code in vendor-specific PCIe switch, SmartNIC, or GPU drivers (e.g., mlxsw, pds_core, qed,
  ionic, amdgpu) that require physical PCIe hardware cards not emulated in standard QEMU.
- Driver .remove, .shutdown, or pci_unregister_driver teardown callbacks (e.g., igb_remove)
  that are executed only during PCI hot-unplug or sysfs driver unbind operations.

If it modifies reachable core kernel logic, drivers, or architectures, use your code search
tools to verify the code can be executed, then return WorthFuzzing=true.

When returning WorthFuzzing=true, you MUST ALSO:
1. Extract any specific kernel functions that should be heavily fuzzed into FocusSymbols.
   Avoid listing generic hot-path functions to prevent skewed test distributions.
   Prefer non-static, non-inlined API entrypoint functions over internal static helper functions
   (which are inlined by the compiler and do not have distinct symbol addresses).
2. Identify any specific CONFIG_ options required to properly test this new/modified feature.
   Go and look into the Kconfig files and check for ifdefs around the code, do not make assumptions.
   Also check "depends on" lines in Kconfig to include any non-standard parent subsystem configs
   needed for Kbuild to compile the code statically into vmlinux. List them in the EnableConfigs
   output array, and DO NOT add a '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: 
For your convenience, here is the diff of the changes:
commit e2c4972e429a2867f3ec0f0ead8972d03b6457d0
Author: syz-cluster <triage@syzkaller.com>
Date:   Mon Aug 10 18:42:15 2026 +0000

    syz-cluster: applied patch under review

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
index 872c48806d091..5e5b8bac53dc2 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
@@ -3327,7 +3327,7 @@ brcmf_cfg80211_set_power_mgmt(struct wiphy *wiphy, struct net_device *ndev,
 		goto done;
 	}
 
-	pm = enabled ? PM_FAST : PM_OFF;
+	pm = enabled ? ifp->drvr->settings->default_pm : PM_OFF;
 	/* Do not enable the power save after assoc if it is a p2p interface */
 	if (ifp->vif->wdev.iftype == NL80211_IFTYPE_P2P_CLIENT) {
 		brcmf_dbg(INFO, "Do not enable power save for P2P clients\n");
@@ -7821,7 +7821,7 @@ static s32 brcmf_config_dongle(struct brcmf_cfg80211_info *cfg)
 
 	brcmf_dongle_scantime(ifp);
 
-	power_mode = cfg->pwr_save ? PM_FAST : PM_OFF;
+	power_mode = cfg->pwr_save ? ifp->drvr->settings->default_pm : PM_OFF;
 	err = brcmf_fil_cmd_int_set(ifp, BRCMF_C_SET_PM, power_mode);
 	if (err)
 		goto default_conf_out;
diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.c
index b6027d83e6ab5..b2e06abc76f8a 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.c
@@ -20,6 +20,7 @@
 #include "of.h"
 #include "firmware.h"
 #include "chip.h"
+#include "defs.h"
 
 MODULE_AUTHOR("Broadcom Corporation");
 MODULE_DESCRIPTION("Broadcom 802.11 wireless LAN fullmac driver.");
@@ -67,6 +68,10 @@ static int brcmf_iapp_enable;
 module_param_named(iapp, brcmf_iapp_enable, int, 0);
 MODULE_PARM_DESC(iapp, "Enable partial support for the obsoleted Inter-Access Point Protocol");
 
+static bool brcmf_max_pm;
+module_param_named(max_pm, brcmf_max_pm, bool, 0400);
+MODULE_PARM_DESC(max_pm, "Use PM_MAX instead of PM_FAST for power management");
+
 #ifdef DEBUG
 /* always succeed brcmf_bus_started() */
 static int brcmf_ignore_probe_fail;
@@ -530,6 +535,7 @@ struct brcmf_mp_device *brcmf_get_module_param(struct device *dev,
 	settings->fcmode = brcmf_fcmode;
 	settings->roamoff = !!brcmf_roamoff;
 	settings->iapp = !!brcmf_iapp_enable;
+	settings->default_pm = brcmf_max_pm ? PM_MAX : PM_FAST;
 #ifdef DEBUG
 	settings->ignore_probe_fail = !!brcmf_ignore_probe_fail;
 #endif
diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.h b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.h
index 3bdb6984b2dd4..d06c734ea82a2 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.h
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.h
@@ -37,6 +37,7 @@ extern struct brcmf_mp_global_t brcmf_mp_global;
  * @feature_disable: Feature_disable bitmask.
  * @fcmode: FWS flow control.
  * @roamoff: Firmware roaming off?
+ * @default_pm: Default power-management mode.
  * @ignore_probe_fail: Ignore probe failure.
  * @trivial_ccode_map: Assume firmware uses ISO3166 country codes with rev 0
  * @country_codes: If available, pointer to struct for translating country codes
@@ -48,6 +49,7 @@ struct brcmf_mp_device {
 	int		fcmode;
 	bool		roamoff;
 	bool		iapp;
+	int		default_pm;
 	bool		ignore_probe_fail;
 	bool		trivial_ccode_map;
 	struct brcmfmac_pd_cc *country_codes;

3/2 2026/08/10 18:42 llm patch-evaluator
0m Model: 
gemini-3.1-pro-preview

Args: 
null

Results: 
null

Tokens: 
							input: 3234
							output: 104
							thoughts: 849

Thoughts: 
**Fuzzing Decision for brcmfmac Power Management Patch**

Okay, let's break this down. This patch is touching the `brcmfmac` driver, specifically within the `drivers/net/wireless/broadcom/brcm80211/brcmfmac/` directory. It's introducing a new module parameter, `max_pm`, which modifies the default power management mode. Instead of the hardcoded `PM_FAST`, the code now uses `PM_MAX` if this new parameter is set, affecting the calls in `brcmf_cfg80211_set_power_mgmt` and `brcmf_config_dongle`.

My initial thought: is this even worth fuzzing? The `brcmfmac` driver is a fullmac Broadcom 802.11 wireless LAN driver. This means it's tightly coupled with specific Broadcom Wi-Fi chips and requires the actual hardware (or at least emulated SDIO/USB/PCIe devices). Can this even be practically fuzzed within a virtualized environment? Wi-Fi drivers are notorious for their hardware dependency. Hmm, but there's USB support, right? (`brcmfmac-usb`). Okay, so there might be a chance for something with USB gadget/dummy_hcd or SDIO emulation...

However, the change itself is... trivial. It’s essentially replacing a hardcoded `PM_FAST` with a variable (`ifp->drvr->settings->default_pm`) whose value is determined by the `max_pm` module parameter. The core logic modification is incredibly minimal:

```c
-	pm = enabled ? PM_FAST : PM_OFF;
+	pm = enabled ? ifp->drvr->settings->default_pm : PM_OFF;
```

and

```c
-	power_mode = cfg->pwr_save ? PM_FAST : PM_OFF;
+	power_mode = cfg->pwr_save ? ifp->drvr->settings->default_pm : PM_OFF;
```

Essentially, the driver will now send `PM_MAX` instead of `PM_FAST` to the firmware if the module parameter is set. This means the change is simply passing a different integer (`brcmf_fil_cmd_int_set(ifp, BRCMF_C_SET_PM, power_mode)`) to the firmware.

Considering all this, I'm leaning heavily towards `WorthFuzzing=false`. It's a very straightforward configuration change, and the core of the function is not modified. It doesn't introduce any new complex control flow or potentially memory-unsafe operations. It’s really just about passing a different numeric value to the device's firmware, with everything depending on the hardware.

Let me double-check: `brcmf_cfg80211_set_power_mgmt` is just a standard cfg80211 callback, and `brcmf_config_dongle` is called during initialization.

Okay, here's a recap of the changes:

```c
static bool brcmf_max_pm;
module_param_named(max_pm, brcmf_max_pm, bool, 0400);
MODULE_PARM_DESC(max_pm, "Use PM_MAX instead of PM_FAST for power management");
```

and

```c
settings->default_pm = brcmf_max_pm ? PM_MAX : PM_FAST;
```

This is just a configuration parameter, pure and simple. It doesn’t affect the core driver execution flow in a way that’s likely to uncover memory safety issues or complex state machine bugs. It's just a variable value transmitted to firmware.

**Therefore, my final conclusion is `WorthFuzzing=false`.** This change is effectively a hardware parameter adjustment, changing a numeric constant sent to the firmware, which does not modify the code in a way suitable for fuzzing. The driver is hardware-specific, requiring specific firmware and hardware interaction for all reasonable use-cases.

4/2 2026/08/10 18:42 tool set-results
0m Args: 
{
  "EnableConfigs": [],
  "FocusSymbols": [],
  "Reasoning": "The patch introduces a module parameter to allow selecting PM_MAX instead of PM_FAST for power management in the brcmfmac driver. This only changes a numeric constant sent to the device firmware and does not alter the execution flow or introduce complex logic in the kernel that would benefit from fuzzing. Furthermore, the driver requires specific Broadcom Wi-Fi hardware.",
  "WorthFuzzing": false
}

Results: 
{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch introduces a module parameter to allow selecting PM_MAX instead of PM_FAST for power management in the brcmfmac driver. This only changes a numeric constant sent to the device firmware and does not alter the execution flow or introduce complex logic in the kernel that would benefit from fuzzing. Furthermore, the driver requires specific Broadcom Wi-Fi hardware.",
  "WorthFuzzing": false
}
5/1 2026/08/10 18:42 action If
0m Args: 
{
  "WorthFuzzing": false
}

Results: 
null
LLM Calls Summary:
Total Calls Total Tokens Avg Tokens Total Duration (Seconds) Avg Duration (Seconds)
Tool Calls Summary:
Total Calls Total Duration (Seconds) Avg Duration (Seconds)