AI Trajectory

null

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "KMSANReasoning": "",
  "NeedsKMSAN": false,
  "Reasoning": "The patch modifies the IBM S/390 CTC/MPC network device driver and finite state machine helper in drivers/s390/net/ctcm_main.c and drivers/s390/net/fsm.c. This code is exclusive to the s390 architecture (depends on CONFIG_S390 and CONFIG_CCW) and is structurally unreachable on the target architecture (amd64).",
  "WorthFuzzing": false
}

null

{
  "PatchDiff": "commit f88297dff053cd44b76a7e95a1305539b6b5084e\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Mon Sep 7 19:54:11 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/drivers/s390/net/ctcm_main.c b/drivers/s390/net/ctcm_main.c\nindex 8b0d76a47d9f0..63f8832f9b149 100644\n--- a/drivers/s390/net/ctcm_main.c\n+++ b/drivers/s390/net/ctcm_main.c\n@@ -211,9 +211,9 @@ static void channel_remove(struct channel *ch)\n \twhile (*c) {\n \t\tif (*c == ch) {\n \t\t\t*c = ch-\u003enext;\n-\t\t\tfsm_deltimer(\u0026ch-\u003etimer);\n+\t\t\ttimer_delete_sync(\u0026ch-\u003etimer.tl);\n \t\t\tif (IS_MPC(ch))\n-\t\t\t\tfsm_deltimer(\u0026ch-\u003esweep_timer);\n+\t\t\t\ttimer_delete_sync(\u0026ch-\u003esweep_timer.tl);\n \n \t\t\tkfree_fsm(ch-\u003efsm);\n \t\t\tclear_normalized_cda(\u0026ch-\u003eccw[4]);\ndiff --git a/drivers/s390/net/fsm.c b/drivers/s390/net/fsm.c\nindex 9b8622aef807b..8d2e9bbb74a23 100644\n--- a/drivers/s390/net/fsm.c\n+++ b/drivers/s390/net/fsm.c\n@@ -171,12 +171,9 @@ fsm_addtimer(fsm_timer *this, int millisec, int event, void *arg)\n \t       this-\u003efi-\u003ename, this, millisec);\n #endif\n \n-\ttimer_setup(\u0026this-\u003etl, fsm_expire_timer, 0);\n \tthis-\u003eexpire_event = event;\n \tthis-\u003eevent_arg = arg;\n-\tthis-\u003etl.expires = jiffies + (millisec * HZ) / 1000;\n-\tadd_timer(\u0026this-\u003etl);\n-\treturn 0;\n+\treturn mod_timer(\u0026this-\u003etl, jiffies + msecs_to_jiffies(millisec));\n }\n \n /* FIXME: this function is never used, why */\n@@ -189,12 +186,9 @@ fsm_modtimer(fsm_timer *this, int millisec, int event, void *arg)\n \t\tthis-\u003efi-\u003ename, this, millisec);\n #endif\n \n-\ttimer_delete(\u0026this-\u003etl);\n-\ttimer_setup(\u0026this-\u003etl, fsm_expire_timer, 0);\n \tthis-\u003eexpire_event = event;\n \tthis-\u003eevent_arg = arg;\n-\tthis-\u003etl.expires = jiffies + (millisec * HZ) / 1000;\n-\tadd_timer(\u0026this-\u003etl);\n+\tmod_timer(\u0026this-\u003etl, jiffies + msecs_to_jiffies(millisec));\n }\n \n EXPORT_SYMBOL(init_fsm);\n"
}

core

null

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch modifies the IBM S/390 CTC/MPC network device driver and finite state machine helper in drivers/s390/net/ctcm_main.c and drivers/s390/net/fsm.c. This code is exclusive to the s390 architecture (depends on CONFIG_S390 and CONFIG_CCW) and is structurally unreachable on the target architecture (amd64).",
  "WorthFuzzing": false
}

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.

Target architecture: amd64

For your convenience, here is the diff of the changes:
commit f88297dff053cd44b76a7e95a1305539b6b5084e
Author: syz-cluster <triage@syzkaller.com>
Date:   Mon Sep 7 19:54:11 2026 +0000

    syz-cluster: applied patch under review

diff --git a/drivers/s390/net/ctcm_main.c b/drivers/s390/net/ctcm_main.c
index 8b0d76a47d9f0..63f8832f9b149 100644
--- a/drivers/s390/net/ctcm_main.c
+++ b/drivers/s390/net/ctcm_main.c
@@ -211,9 +211,9 @@ static void channel_remove(struct channel *ch)
 	while (*c) {
 		if (*c == ch) {
 			*c = ch->next;
-			fsm_deltimer(&ch->timer);
+			timer_delete_sync(&ch->timer.tl);
 			if (IS_MPC(ch))
-				fsm_deltimer(&ch->sweep_timer);
+				timer_delete_sync(&ch->sweep_timer.tl);
 
 			kfree_fsm(ch->fsm);
 			clear_normalized_cda(&ch->ccw[4]);
diff --git a/drivers/s390/net/fsm.c b/drivers/s390/net/fsm.c
index 9b8622aef807b..8d2e9bbb74a23 100644
--- a/drivers/s390/net/fsm.c
+++ b/drivers/s390/net/fsm.c
@@ -171,12 +171,9 @@ fsm_addtimer(fsm_timer *this, int millisec, int event, void *arg)
 	       this->fi->name, this, millisec);
 #endif
 
-	timer_setup(&this->tl, fsm_expire_timer, 0);
 	this->expire_event = event;
 	this->event_arg = arg;
-	this->tl.expires = jiffies + (millisec * HZ) / 1000;
-	add_timer(&this->tl);
-	return 0;
+	return mod_timer(&this->tl, jiffies + msecs_to_jiffies(millisec));
 }
 
 /* FIXME: this function is never used, why */
@@ -189,12 +186,9 @@ fsm_modtimer(fsm_timer *this, int millisec, int event, void *arg)
 		this->fi->name, this, millisec);
 #endif
 
-	timer_delete(&this->tl);
-	timer_setup(&this->tl, fsm_expire_timer, 0);
 	this->expire_event = event;
 	this->event_arg = arg;
-	this->tl.expires = jiffies + (millisec * HZ) / 1000;
-	add_timer(&this->tl);
+	mod_timer(&this->tl, jiffies + msecs_to_jiffies(millisec));
 }
 
 EXPORT_SYMBOL(init_fsm);

gemini-3.7-flash

null

null

							input: 3420
							output: 29
							thoughts: 125
						

**Analyzing the Patch for Compatibility**

Okay, so the architecture is amd64, which is good to know from the start. Now, the patch is touching files within the `drivers/s390/net/` directory, specifically `ctcm_main.c` and `fsm.c`. My immediate thought is, "Will this even apply cleanly, given the target architecture and the *s390* component?" 

I need to confirm the Kconfig reachability of this specific network module. My next step is to use `grepper` or `read-file` to check the relevant Kconfig files. I'll start with `drivers/s390/net/Kconfig` to see if the module is conditionally compiled, then broaden the search to `drivers/s390/Kconfig` to understand the overall build configuration. This will give me the information I need to assess how this change will impact the system. I also need to understand if there is cross compilation occurring or if these are x86/amd64 specific changes.

{
  "Expression": "CTCM",
  "PathPrefix": "drivers/s390/"
}

{
  "Output": "\nFull output is too long, showing 500 out of 1803 lines.\nUse more precise expression if possible.\n\ndrivers/s390/net/Kconfig=2=menu \"S/390 network device drivers\"\n--\ndrivers/s390/net/Kconfig-4-\ndrivers/s390/net/Kconfig:5:config CTCM\ndrivers/s390/net/Kconfig-6-\tdef_tristate m\n--\ndrivers/s390/net/Kconfig=78=config CCWGROUP\ndrivers/s390/net/Kconfig-79-\ttristate\ndrivers/s390/net/Kconfig:80:\tdefault (CTCM || QETH || SMC)\ndrivers/s390/net/Kconfig-81-\n--\ndrivers/s390/net/Makefile=8=ctcm-y += ctcm_main.o ctcm_fsms.o ctcm_mpc.o ctcm_sysfs.o ctcm_dbug.o\ndrivers/s390/net/Makefile:9:obj-$(CONFIG_CTCM) += ctcm.o fsm.o\ndrivers/s390/net/Makefile-10-obj-$(CONFIG_SMSGIUCV) += smsgiucv.o\n--\ndrivers/s390/net/ctcm_dbug.c-23-\ndrivers/s390/net/ctcm_dbug.c:24:struct ctcm_dbf_info ctcm_dbf[CTCM_DBF_INFOS] = {\ndrivers/s390/net/ctcm_dbug.c:25:\t[CTCM_DBF_SETUP]     = {\"ctc_setup\", 8, 1, 64, CTC_DBF_INFO, NULL},\ndrivers/s390/net/ctcm_dbug.c:26:\t[CTCM_DBF_ERROR]     = {\"ctc_error\", 8, 1, 64, CTC_DBF_ERROR, NULL},\ndrivers/s390/net/ctcm_dbug.c:27:\t[CTCM_DBF_TRACE]     = {\"ctc_trace\", 8, 1, 64, CTC_DBF_ERROR, NULL},\ndrivers/s390/net/ctcm_dbug.c:28:\t[CTCM_DBF_MPC_SETUP] = {\"mpc_setup\", 8, 1, 80, CTC_DBF_INFO, NULL},\ndrivers/s390/net/ctcm_dbug.c:29:\t[CTCM_DBF_MPC_ERROR] = {\"mpc_error\", 8, 1, 80, CTC_DBF_ERROR, NULL},\ndrivers/s390/net/ctcm_dbug.c:30:\t[CTCM_DBF_MPC_TRACE] = {\"mpc_trace\", 8, 1, 80, CTC_DBF_ERROR, NULL},\ndrivers/s390/net/ctcm_dbug.c-31-};\n--\ndrivers/s390/net/ctcm_dbug.c=33=void ctcm_unregister_dbf_views(void)\n--\ndrivers/s390/net/ctcm_dbug.c-35-\tint x;\ndrivers/s390/net/ctcm_dbug.c:36:\tfor (x = 0; x \u003c CTCM_DBF_INFOS; x++) {\ndrivers/s390/net/ctcm_dbug.c-37-\t\tdebug_unregister(ctcm_dbf[x].id);\n--\ndrivers/s390/net/ctcm_dbug.c=42=int ctcm_register_dbf_views(void)\n--\ndrivers/s390/net/ctcm_dbug.c-44-\tint x;\ndrivers/s390/net/ctcm_dbug.c:45:\tfor (x = 0; x \u003c CTCM_DBF_INFOS; x++) {\ndrivers/s390/net/ctcm_dbug.c-46-\t\t/* register the areas */\n--\ndrivers/s390/net/ctcm_dbug.h-7-\ndrivers/s390/net/ctcm_dbug.h:8:#ifndef _CTCM_DBUG_H_\ndrivers/s390/net/ctcm_dbug.h:9:#define _CTCM_DBUG_H_\ndrivers/s390/net/ctcm_dbug.h-10-\n--\ndrivers/s390/net/ctcm_dbug.h=45=enum ctcm_dbf_names {\ndrivers/s390/net/ctcm_dbug.h:46:\tCTCM_DBF_SETUP,\ndrivers/s390/net/ctcm_dbug.h:47:\tCTCM_DBF_ERROR,\ndrivers/s390/net/ctcm_dbug.h:48:\tCTCM_DBF_TRACE,\ndrivers/s390/net/ctcm_dbug.h:49:\tCTCM_DBF_MPC_SETUP,\ndrivers/s390/net/ctcm_dbug.h:50:\tCTCM_DBF_MPC_ERROR,\ndrivers/s390/net/ctcm_dbug.h:51:\tCTCM_DBF_MPC_TRACE,\ndrivers/s390/net/ctcm_dbug.h:52:\tCTCM_DBF_INFOS\t/* must be last element */\ndrivers/s390/net/ctcm_dbug.h-53-};\n--\ndrivers/s390/net/ctcm_dbug.h=55=struct ctcm_dbf_info {\n--\ndrivers/s390/net/ctcm_dbug.h-63-\ndrivers/s390/net/ctcm_dbug.h:64:extern struct ctcm_dbf_info ctcm_dbf[CTCM_DBF_INFOS];\ndrivers/s390/net/ctcm_dbug.h-65-\n--\ndrivers/s390/net/ctcm_dbug.h=71=static inline const char *strtail(const char *s, int n)\n--\ndrivers/s390/net/ctcm_dbug.h-76-\ndrivers/s390/net/ctcm_dbug.h:77:#define CTCM_FUNTAIL strtail((char *)__func__, 16)\ndrivers/s390/net/ctcm_dbug.h-78-\ndrivers/s390/net/ctcm_dbug.h:79:#define CTCM_DBF_TEXT(name, level, text) \\\ndrivers/s390/net/ctcm_dbug.h-80-\tdo { \\\ndrivers/s390/net/ctcm_dbug.h:81:\t\tdebug_text_event(ctcm_dbf[CTCM_DBF_##name].id, level, text); \\\ndrivers/s390/net/ctcm_dbug.h-82-\t} while (0)\ndrivers/s390/net/ctcm_dbug.h-83-\ndrivers/s390/net/ctcm_dbug.h:84:#define CTCM_DBF_HEX(name, level, addr, len) \\\ndrivers/s390/net/ctcm_dbug.h-85-\tdo { \\\ndrivers/s390/net/ctcm_dbug.h:86:\t\tdebug_event(ctcm_dbf[CTCM_DBF_##name].id, \\\ndrivers/s390/net/ctcm_dbug.h-87-\t\t\t\t\tlevel, (void *)(addr), len); \\\n--\ndrivers/s390/net/ctcm_dbug.h-89-\ndrivers/s390/net/ctcm_dbug.h:90:#define CTCM_DBF_TEXT_(name, level, text...) \\\ndrivers/s390/net/ctcm_dbug.h:91:\tctcm_dbf_longtext(CTCM_DBF_##name, level, text)\ndrivers/s390/net/ctcm_dbug.h-92-\n--\ndrivers/s390/net/ctcm_dbug.h-97- */\ndrivers/s390/net/ctcm_dbug.h:98:#define CTCM_DBF_DEV_NAME(cat, dev, text) \\\ndrivers/s390/net/ctcm_dbug.h-99-\tdo { \\\ndrivers/s390/net/ctcm_dbug.h:100:\t\tCTCM_DBF_TEXT_(cat, CTC_DBF_INFO, \"%s(%s) :- %s\", \\\ndrivers/s390/net/ctcm_dbug.h:101:\t\t\tCTCM_FUNTAIL, dev-\u003ename, text); \\\ndrivers/s390/net/ctcm_dbug.h-102-\t} while (0)\n--\ndrivers/s390/net/ctcm_dbug.h-105-\tdo { \\\ndrivers/s390/net/ctcm_dbug.h:106:\t\tCTCM_DBF_TEXT_(MPC_##cat, CTC_DBF_INFO, \"%s(%s) := %s\", \\\ndrivers/s390/net/ctcm_dbug.h:107:\t\t\tCTCM_FUNTAIL, dev-\u003ename, text); \\\ndrivers/s390/net/ctcm_dbug.h-108-\t} while (0)\ndrivers/s390/net/ctcm_dbug.h-109-\ndrivers/s390/net/ctcm_dbug.h:110:#define CTCMY_DBF_DEV_NAME(cat, dev, text) \\\ndrivers/s390/net/ctcm_dbug.h-111-\tdo { \\\n--\ndrivers/s390/net/ctcm_dbug.h-114-\t\telse \\\ndrivers/s390/net/ctcm_dbug.h:115:\t\t\tCTCM_DBF_DEV_NAME(cat, dev, text); \\\ndrivers/s390/net/ctcm_dbug.h-116-\t} while (0)\n--\ndrivers/s390/net/ctcm_dbug.h-122- */\ndrivers/s390/net/ctcm_dbug.h:123:#define CTCM_DBF_DEV(cat, dev, text) \\\ndrivers/s390/net/ctcm_dbug.h-124-\tdo { \\\ndrivers/s390/net/ctcm_dbug.h:125:\t\tCTCM_DBF_TEXT_(cat, CTC_DBF_INFO, \"%s(%p) :-: %s\", \\\ndrivers/s390/net/ctcm_dbug.h:126:\t\t\tCTCM_FUNTAIL, dev, text); \\\ndrivers/s390/net/ctcm_dbug.h-127-\t} while (0)\n--\ndrivers/s390/net/ctcm_dbug.h-130-\tdo { \\\ndrivers/s390/net/ctcm_dbug.h:131:\t\tCTCM_DBF_TEXT_(MPC_##cat, CTC_DBF_INFO, \"%s(%p) :=: %s\", \\\ndrivers/s390/net/ctcm_dbug.h:132:\t\t\tCTCM_FUNTAIL, dev, text); \\\ndrivers/s390/net/ctcm_dbug.h-133-\t} while (0)\ndrivers/s390/net/ctcm_dbug.h-134-\ndrivers/s390/net/ctcm_dbug.h:135:#define CTCMY_DBF_DEV(cat, dev, text) \\\ndrivers/s390/net/ctcm_dbug.h-136-\tdo { \\\n--\ndrivers/s390/net/ctcm_dbug.h-139-\t\telse \\\ndrivers/s390/net/ctcm_dbug.h:140:\t\t\tCTCM_DBF_DEV(cat, dev, text); \\\ndrivers/s390/net/ctcm_dbug.h-141-\t} while (0)\n--\ndrivers/s390/net/ctcm_fsms.c=190=void ctcm_ccw_check_rc(struct channel *ch, int rc, char *msg)\ndrivers/s390/net/ctcm_fsms.c-191-{\ndrivers/s390/net/ctcm_fsms.c:192:\tCTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,\ndrivers/s390/net/ctcm_fsms.c-193-\t\t\"%s(%s): %s: %04x\\n\",\ndrivers/s390/net/ctcm_fsms.c:194:\t\tCTCM_FUNTAIL, ch-\u003eid, msg, rc);\ndrivers/s390/net/ctcm_fsms.c-195-\tswitch (rc) {\n--\ndrivers/s390/net/ctcm_fsms.c=213=void ctcm_purge_skb_queue(struct sk_buff_head *q)\n--\ndrivers/s390/net/ctcm_fsms.c-216-\ndrivers/s390/net/ctcm_fsms.c:217:\tCTCM_DBF_TEXT(TRACE, CTC_DBF_DEBUG, __func__);\ndrivers/s390/net/ctcm_fsms.c-218-\n--\ndrivers/s390/net/ctcm_fsms.c=245=static void chx_txdone(fsm_instance *fi, int event, void *arg)\n--\ndrivers/s390/net/ctcm_fsms.c-255-\ndrivers/s390/net/ctcm_fsms.c:256:\tCTCM_PR_DEBUG(\"%s(%s): %s\\n\", __func__, ch-\u003eid, dev-\u003ename);\ndrivers/s390/net/ctcm_fsms.c-257-\n--\ndrivers/s390/net/ctcm_fsms.c-262-\tif (ch-\u003eirb-\u003escsw.cmd.count != 0)\ndrivers/s390/net/ctcm_fsms.c:263:\t\tCTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,\ndrivers/s390/net/ctcm_fsms.c-264-\t\t\t\"%s(%s): TX not complete, remaining %d bytes\",\ndrivers/s390/net/ctcm_fsms.c:265:\t\t\t     CTCM_FUNTAIL, dev-\u003ename, ch-\u003eirb-\u003escsw.cmd.count);\ndrivers/s390/net/ctcm_fsms.c-266-\tfsm_deltimer(\u0026ch-\u003etimer);\n--\ndrivers/s390/net/ctcm_fsms.c-306-\t\tch-\u003eccw[1].count = ch-\u003etrans_skb-\u003elen;\ndrivers/s390/net/ctcm_fsms.c:307:\t\tfsm_addtimer(\u0026ch-\u003etimer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);\ndrivers/s390/net/ctcm_fsms.c-308-\t\tch-\u003eprof.send_stamp = jiffies;\n--\ndrivers/s390/net/ctcm_fsms.c=333=void ctcm_chx_txidle(fsm_instance *fi, int event, void *arg)\n--\ndrivers/s390/net/ctcm_fsms.c-338-\ndrivers/s390/net/ctcm_fsms.c:339:\tCTCM_PR_DEBUG(\"%s(%s): %s\\n\", __func__, ch-\u003eid, dev-\u003ename);\ndrivers/s390/net/ctcm_fsms.c-340-\n--\ndrivers/s390/net/ctcm_fsms.c=354=static void chx_rx(fsm_instance *fi, int event, void *arg)\n--\ndrivers/s390/net/ctcm_fsms.c-366-\tif (len \u003c 8) {\ndrivers/s390/net/ctcm_fsms.c:367:\t\tCTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,\ndrivers/s390/net/ctcm_fsms.c-368-\t\t\t\"%s(%s): got packet with length %d \u003c 8\\n\",\ndrivers/s390/net/ctcm_fsms.c:369:\t\t\t\t\tCTCM_FUNTAIL, dev-\u003ename, len);\ndrivers/s390/net/ctcm_fsms.c-370-\t\tpriv-\u003estats.rx_dropped++;\n--\ndrivers/s390/net/ctcm_fsms.c-374-\tif (len \u003e ch-\u003emax_bufsize) {\ndrivers/s390/net/ctcm_fsms.c:375:\t\tCTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,\ndrivers/s390/net/ctcm_fsms.c-376-\t\t\t\"%s(%s): got packet with length %d \u003e %d\\n\",\ndrivers/s390/net/ctcm_fsms.c:377:\t\t\t\tCTCM_FUNTAIL, dev-\u003ename, len, ch-\u003emax_bufsize);\ndrivers/s390/net/ctcm_fsms.c-378-\t\tpriv-\u003estats.rx_dropped++;\n--\ndrivers/s390/net/ctcm_fsms.c-386-\tswitch (ch-\u003eprotocol) {\ndrivers/s390/net/ctcm_fsms.c:387:\tcase CTCM_PROTO_S390:\ndrivers/s390/net/ctcm_fsms.c:388:\tcase CTCM_PROTO_OS390:\ndrivers/s390/net/ctcm_fsms.c-389-\t\tcheck_len = block_len + 2;\n--\ndrivers/s390/net/ctcm_fsms.c-395-\tif ((len \u003c block_len) || (len \u003e check_len)) {\ndrivers/s390/net/ctcm_fsms.c:396:\t\tCTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,\ndrivers/s390/net/ctcm_fsms.c-397-\t\t\t\"%s(%s): got block length %d != rx length %d\\n\",\ndrivers/s390/net/ctcm_fsms.c:398:\t\t\t\tCTCM_FUNTAIL, dev-\u003ename, block_len, len);\ndrivers/s390/net/ctcm_fsms.c-399-\t\tif (do_debug)\n--\ndrivers/s390/net/ctcm_fsms.c=430=static void chx_firstio(fsm_instance *fi, int event, void *arg)\n--\ndrivers/s390/net/ctcm_fsms.c-435-\ndrivers/s390/net/ctcm_fsms.c:436:\tCTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,\ndrivers/s390/net/ctcm_fsms.c-437-\t\t\"%s(%s) : %02x\",\ndrivers/s390/net/ctcm_fsms.c:438:\t\tCTCM_FUNTAIL, ch-\u003eid, fsmstate);\ndrivers/s390/net/ctcm_fsms.c-439-\n--\ndrivers/s390/net/ctcm_fsms.c-441-\tif (fsmstate == CTC_STATE_TXIDLE)\ndrivers/s390/net/ctcm_fsms.c:442:\t\tCTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,\ndrivers/s390/net/ctcm_fsms.c-443-\t\t\t\"%s(%s): remote side issued READ?, init.\\n\",\ndrivers/s390/net/ctcm_fsms.c:444:\t\t\t\tCTCM_FUNTAIL, ch-\u003eid);\ndrivers/s390/net/ctcm_fsms.c-445-\tfsm_deltimer(\u0026ch-\u003etimer);\n--\ndrivers/s390/net/ctcm_fsms.c-448-\tif ((fsmstate == CTC_STATE_SETUPWAIT) \u0026\u0026\ndrivers/s390/net/ctcm_fsms.c:449:\t    (ch-\u003eprotocol == CTCM_PROTO_OS390)) {\ndrivers/s390/net/ctcm_fsms.c-450-\t\t/* OS/390 resp. z/OS */\ndrivers/s390/net/ctcm_fsms.c:451:\t\tif (CHANNEL_DIRECTION(ch-\u003eflags) == CTCM_READ) {\ndrivers/s390/net/ctcm_fsms.c:452:\t\t\t*((__u16 *)ch-\u003etrans_skb-\u003edata) = CTCM_INITIAL_BLOCKLEN;\ndrivers/s390/net/ctcm_fsms.c:453:\t\t\tfsm_addtimer(\u0026ch-\u003etimer, CTCM_TIME_5_SEC,\ndrivers/s390/net/ctcm_fsms.c-454-\t\t\t\t     CTC_EVENT_TIMER, ch);\n--\ndrivers/s390/net/ctcm_fsms.c-468-\t */\ndrivers/s390/net/ctcm_fsms.c:469:\tif ((CHANNEL_DIRECTION(ch-\u003eflags) == CTCM_WRITE) ||\ndrivers/s390/net/ctcm_fsms.c:470:\t    (ch-\u003eprotocol != CTCM_PROTO_S390))\ndrivers/s390/net/ctcm_fsms.c:471:\t\tfsm_addtimer(\u0026ch-\u003etimer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);\ndrivers/s390/net/ctcm_fsms.c-472-\ndrivers/s390/net/ctcm_fsms.c:473:\t*((__u16 *)ch-\u003etrans_skb-\u003edata) = CTCM_INITIAL_BLOCKLEN;\ndrivers/s390/net/ctcm_fsms.c-474-\tch-\u003eccw[1].count = 2;\t/* Transfer only length */\ndrivers/s390/net/ctcm_fsms.c-475-\ndrivers/s390/net/ctcm_fsms.c:476:\tfsm_newstate(fi, (CHANNEL_DIRECTION(ch-\u003eflags) == CTCM_READ)\ndrivers/s390/net/ctcm_fsms.c-477-\t\t     ? CTC_STATE_RXINIT : CTC_STATE_TXINIT);\n--\ndrivers/s390/net/ctcm_fsms.c-490-\t */\ndrivers/s390/net/ctcm_fsms.c:491:\tif ((CHANNEL_DIRECTION(ch-\u003eflags) == CTCM_READ) \u0026\u0026\ndrivers/s390/net/ctcm_fsms.c:492:\t    (ch-\u003eprotocol == CTCM_PROTO_S390)) {\ndrivers/s390/net/ctcm_fsms.c-493-\t\tstruct net_device *dev = ch-\u003enetdev;\n--\ndrivers/s390/net/ctcm_fsms.c=508=static void chx_rxidle(fsm_instance *fi, int event, void *arg)\n--\ndrivers/s390/net/ctcm_fsms.c-517-\tbuflen = *((__u16 *)ch-\u003etrans_skb-\u003edata);\ndrivers/s390/net/ctcm_fsms.c:518:\tCTCM_PR_DEBUG(\"%s: %s: Initial RX count = %d\\n\",\ndrivers/s390/net/ctcm_fsms.c-519-\t\t\t__func__, dev-\u003ename, buflen);\ndrivers/s390/net/ctcm_fsms.c-520-\ndrivers/s390/net/ctcm_fsms.c:521:\tif (buflen \u003e= CTCM_INITIAL_BLOCKLEN) {\ndrivers/s390/net/ctcm_fsms.c-522-\t\tif (ctcm_checkalloc_buffer(ch))\n--\ndrivers/s390/net/ctcm_fsms.c-532-\t} else {\ndrivers/s390/net/ctcm_fsms.c:533:\t\tCTCM_PR_DEBUG(\"%s: %s: Initial RX count %d not %d\\n\",\ndrivers/s390/net/ctcm_fsms.c-534-\t\t\t\t__func__, dev-\u003ename,\ndrivers/s390/net/ctcm_fsms.c:535:\t\t\t\t\tbuflen, CTCM_INITIAL_BLOCKLEN);\ndrivers/s390/net/ctcm_fsms.c-536-\t\tchx_firstio(fi, event, arg);\n--\ndrivers/s390/net/ctcm_fsms.c=548=__context_unsafe(/* Conditional locking */)\n--\ndrivers/s390/net/ctcm_fsms.c-552-\tunsigned long saveflags = 0;\ndrivers/s390/net/ctcm_fsms.c:553:\tint timeout = CTCM_TIME_5_SEC;\ndrivers/s390/net/ctcm_fsms.c-554-\n--\ndrivers/s390/net/ctcm_fsms.c-557-\t\ttimeout = 1500;\ndrivers/s390/net/ctcm_fsms.c:558:\t\tCTCM_PR_DEBUG(\"enter %s: cp=%i ch=0x%p id=%s\\n\",\ndrivers/s390/net/ctcm_fsms.c-559-\t\t\t\t__func__, smp_processor_id(), ch, ch-\u003eid);\n--\ndrivers/s390/net/ctcm_fsms.c-562-\tfsm_newstate(fi, CTC_STATE_SETUPWAIT);\ndrivers/s390/net/ctcm_fsms.c:563:\tCTCM_CCW_DUMP((char *)\u0026ch-\u003eccw[6], sizeof(struct ccw1) * 2);\ndrivers/s390/net/ctcm_fsms.c-564-\n--\ndrivers/s390/net/ctcm_fsms.c=586=static void ctcm_chx_start(fsm_instance *fi, int event, void *arg)\n--\ndrivers/s390/net/ctcm_fsms.c-591-\ndrivers/s390/net/ctcm_fsms.c:592:\tCTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, \"%s(%s): %s\",\ndrivers/s390/net/ctcm_fsms.c:593:\t\tCTCM_FUNTAIL, ch-\u003eid,\ndrivers/s390/net/ctcm_fsms.c:594:\t\t(CHANNEL_DIRECTION(ch-\u003eflags) == CTCM_READ) ? \"RX\" : \"TX\");\ndrivers/s390/net/ctcm_fsms.c-595-\n--\ndrivers/s390/net/ctcm_fsms.c-600-\t}\ndrivers/s390/net/ctcm_fsms.c:601:\tif (CHANNEL_DIRECTION(ch-\u003eflags) == CTCM_READ) {\ndrivers/s390/net/ctcm_fsms.c-602-\t\tch-\u003eccw[1].cmd_code = CCW_CMD_READ;\n--\ndrivers/s390/net/ctcm_fsms.c-610-\tif (ctcm_checkalloc_buffer(ch)) {\ndrivers/s390/net/ctcm_fsms.c:611:\t\tCTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,\ndrivers/s390/net/ctcm_fsms.c-612-\t\t\t\"%s(%s): %s trans_skb alloc delayed \"\ndrivers/s390/net/ctcm_fsms.c-613-\t\t\t\"until first transfer\",\ndrivers/s390/net/ctcm_fsms.c:614:\t\t\tCTCM_FUNTAIL, ch-\u003eid,\ndrivers/s390/net/ctcm_fsms.c:615:\t\t\t(CHANNEL_DIRECTION(ch-\u003eflags) == CTCM_READ) ?\ndrivers/s390/net/ctcm_fsms.c-616-\t\t\t\t\"RX\" : \"TX\");\n--\ndrivers/s390/net/ctcm_fsms.c=650=__context_unsafe(/* Conditional locking */)\n--\ndrivers/s390/net/ctcm_fsms.c-660-\ndrivers/s390/net/ctcm_fsms.c:661:\tfsm_addtimer(\u0026ch-\u003etimer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);\ndrivers/s390/net/ctcm_fsms.c-662-\n--\ndrivers/s390/net/ctcm_fsms.c=689=static void ctcm_chx_cleanup(fsm_instance *fi, int state,\n--\ndrivers/s390/net/ctcm_fsms.c-694-\ndrivers/s390/net/ctcm_fsms.c:695:\tCTCM_DBF_TEXT_(SETUP, CTC_DBF_NOTICE,\ndrivers/s390/net/ctcm_fsms.c-696-\t\t\t\"%s(%s): %s[%d]\\n\",\ndrivers/s390/net/ctcm_fsms.c:697:\t\t\tCTCM_FUNTAIL, dev-\u003ename, ch-\u003eid, state);\ndrivers/s390/net/ctcm_fsms.c-698-\n--\ndrivers/s390/net/ctcm_fsms.c-711-\tch-\u003eth_seq_num = 0x00;\ndrivers/s390/net/ctcm_fsms.c:712:\tif (CHANNEL_DIRECTION(ch-\u003eflags) == CTCM_READ) {\ndrivers/s390/net/ctcm_fsms.c-713-\t\tskb_queue_purge(\u0026ch-\u003eio_queue);\n--\ndrivers/s390/net/ctcm_fsms.c=774=static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg)\n--\ndrivers/s390/net/ctcm_fsms.c-789-\t\tfsm_deltimer(\u0026ch-\u003etimer);\ndrivers/s390/net/ctcm_fsms.c:790:\t\tfsm_addtimer(\u0026ch-\u003etimer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);\ndrivers/s390/net/ctcm_fsms.c-791-\t\tif (!IS_MPC(ch) \u0026\u0026\ndrivers/s390/net/ctcm_fsms.c:792:\t\t    (CHANNEL_DIRECTION(ch-\u003eflags) == CTCM_READ)) {\ndrivers/s390/net/ctcm_fsms.c-793-\t\t\tint rc = ccw_device_halt(ch-\u003ecdev, 0);\n--\ndrivers/s390/net/ctcm_fsms.c-800-\ndrivers/s390/net/ctcm_fsms.c:801:\tCTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT,\ndrivers/s390/net/ctcm_fsms.c-802-\t\t\"%s(%s) : %s error during %s channel setup state=%s\\n\",\ndrivers/s390/net/ctcm_fsms.c:803:\t\tCTCM_FUNTAIL, dev-\u003ename, ctc_ch_event_names[event],\ndrivers/s390/net/ctcm_fsms.c:804:\t\t(CHANNEL_DIRECTION(ch-\u003eflags) == CTCM_READ) ? \"RX\" : \"TX\",\ndrivers/s390/net/ctcm_fsms.c-805-\t\tfsm_getstate_str(fi));\ndrivers/s390/net/ctcm_fsms.c-806-\ndrivers/s390/net/ctcm_fsms.c:807:\tif (CHANNEL_DIRECTION(ch-\u003eflags) == CTCM_READ) {\ndrivers/s390/net/ctcm_fsms.c-808-\t\tfsm_newstate(fi, CTC_STATE_RXERR);\n--\ndrivers/s390/net/ctcm_fsms.c=824=__context_unsafe(/* Conditional locking */)\n--\ndrivers/s390/net/ctcm_fsms.c-831-\ndrivers/s390/net/ctcm_fsms.c:832:\tCTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,\ndrivers/s390/net/ctcm_fsms.c-833-\t\t\"%s: %s[%d] of %s\\n\",\ndrivers/s390/net/ctcm_fsms.c:834:\t\t\tCTCM_FUNTAIL, ch-\u003eid, event, dev-\u003ename);\ndrivers/s390/net/ctcm_fsms.c-835-\n--\ndrivers/s390/net/ctcm_fsms.c-837-\ndrivers/s390/net/ctcm_fsms.c:838:\tfsm_addtimer(\u0026ch-\u003etimer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);\ndrivers/s390/net/ctcm_fsms.c-839-\toldstate = fsm_getstate(fi);\n--\ndrivers/s390/net/ctcm_fsms.c=863=static void ctcm_chx_rxiniterr(fsm_instance *fi, int event, void *arg)\n--\ndrivers/s390/net/ctcm_fsms.c-879-\t} else if (event == CTC_EVENT_UC_RCRESET) {\ndrivers/s390/net/ctcm_fsms.c:880:\t\tCTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,\ndrivers/s390/net/ctcm_fsms.c:881:\t\t\t       \"%s(%s): %s in %s\", CTCM_FUNTAIL, ch-\u003eid,\ndrivers/s390/net/ctcm_fsms.c-882-\t\t\t       ctc_ch_event_names[event], fsm_getstate_str(fi));\n--\ndrivers/s390/net/ctcm_fsms.c-886-\t} else {\ndrivers/s390/net/ctcm_fsms.c:887:\t\tCTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,\ndrivers/s390/net/ctcm_fsms.c:888:\t\t\t\"%s(%s): %s in %s\", CTCM_FUNTAIL, ch-\u003eid,\ndrivers/s390/net/ctcm_fsms.c-889-\t\t\tctc_ch_event_names[event], fsm_getstate_str(fi));\n--\ndrivers/s390/net/ctcm_fsms.c=905=static void ctcm_chx_rxinitfail(fsm_instance *fi, int event, void *arg)\n--\ndrivers/s390/net/ctcm_fsms.c-910-\ndrivers/s390/net/ctcm_fsms.c:911:\tCTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,\ndrivers/s390/net/ctcm_fsms.c-912-\t\t\t\"%s(%s): RX %s busy, init. fail\",\ndrivers/s390/net/ctcm_fsms.c:913:\t\t\t\tCTCM_FUNTAIL, dev-\u003ename, ch-\u003eid);\ndrivers/s390/net/ctcm_fsms.c-914-\tfsm_newstate(fi, CTC_STATE_RXERR);\n--\ndrivers/s390/net/ctcm_fsms.c=925=static void ctcm_chx_rxdisc(fsm_instance *fi, int event, void *arg)\n--\ndrivers/s390/net/ctcm_fsms.c-931-\ndrivers/s390/net/ctcm_fsms.c:932:\tCTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,\ndrivers/s390/net/ctcm_fsms.c-933-\t\t\t\"%s: %s: remote disconnect - re-init ...\",\ndrivers/s390/net/ctcm_fsms.c:934:\t\t\t\tCTCM_FUNTAIL, dev-\u003ename);\ndrivers/s390/net/ctcm_fsms.c-935-\tfsm_deltimer(\u0026ch-\u003etimer);\n--\ndrivers/s390/net/ctcm_fsms.c-942-\tfsm_newstate(fi, CTC_STATE_DTERM);\ndrivers/s390/net/ctcm_fsms.c:943:\tch2 = priv-\u003echannel[CTCM_WRITE];\ndrivers/s390/net/ctcm_fsms.c-944-\tfsm_newstate(ch2-\u003efsm, CTC_STATE_DTERM);\n--\ndrivers/s390/net/ctcm_fsms.c=957=static void ctcm_chx_txiniterr(fsm_instance *fi, int event, void *arg)\n--\ndrivers/s390/net/ctcm_fsms.c-971-\t} else if (event == CTC_EVENT_UC_RCRESET) {\ndrivers/s390/net/ctcm_fsms.c:972:\t\tCTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,\ndrivers/s390/net/ctcm_fsms.c:973:\t\t\t       \"%s(%s): %s in %s\", CTCM_FUNTAIL, ch-\u003eid,\ndrivers/s390/net/ctcm_fsms.c-974-\t\t\t       ctc_ch_event_names[event], fsm_getstate_str(fi));\n--\ndrivers/s390/net/ctcm_fsms.c-978-\t} else {\ndrivers/s390/net/ctcm_fsms.c:979:\t\tCTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,\ndrivers/s390/net/ctcm_fsms.c:980:\t\t\t\"%s(%s): %s in %s\", CTCM_FUNTAIL, ch-\u003eid,\ndrivers/s390/net/ctcm_fsms.c-981-\t\t\tctc_ch_event_names[event], fsm_getstate_str(fi));\n--\ndrivers/s390/net/ctcm_fsms.c=997=__context_unsafe(/* Conditional locking */)\n--\ndrivers/s390/net/ctcm_fsms.c-1003-\ndrivers/s390/net/ctcm_fsms.c:1004:\tCTCM_PR_DEBUG(\"Enter: %s: cp=%i ch=0x%p id=%s\\n\",\ndrivers/s390/net/ctcm_fsms.c-1005-\t\t\t__func__, smp_processor_id(), ch, ch-\u003eid);\n--\ndrivers/s390/net/ctcm_fsms.c-1009-\t\tstruct mpc_group *gptr = priv-\u003empcg;\ndrivers/s390/net/ctcm_fsms.c:1010:\t\tCTCM_DBF_TEXT_(TRACE, CTC_DBF_INFO,\ndrivers/s390/net/ctcm_fsms.c-1011-\t\t\t\t\"%s: %s: retries exceeded\",\ndrivers/s390/net/ctcm_fsms.c:1012:\t\t\t\t\tCTCM_FUNTAIL, ch-\u003eid);\ndrivers/s390/net/ctcm_fsms.c-1013-\t\tfsm_event(priv-\u003efsm, DEV_EVENT_TXDOWN, dev);\n--\ndrivers/s390/net/ctcm_fsms.c-1020-\ndrivers/s390/net/ctcm_fsms.c:1021:\tCTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,\ndrivers/s390/net/ctcm_fsms.c-1022-\t\t\t\"%s : %s: retry %d\",\ndrivers/s390/net/ctcm_fsms.c:1023:\t\t\t\tCTCM_FUNTAIL, ch-\u003eid, ch-\u003eretry);\ndrivers/s390/net/ctcm_fsms.c-1024-\tskb = skb_peek(\u0026ch-\u003eio_queue);\n--\ndrivers/s390/net/ctcm_fsms.c-1030-\t\tif (set_normalized_cda(\u0026ch-\u003eccw[4], skb-\u003edata)) {\ndrivers/s390/net/ctcm_fsms.c:1031:\t\t\tCTCM_DBF_TEXT_(TRACE, CTC_DBF_INFO,\ndrivers/s390/net/ctcm_fsms.c-1032-\t\t\t\t\"%s: %s: IDAL alloc failed\",\ndrivers/s390/net/ctcm_fsms.c:1033:\t\t\t\t\t\tCTCM_FUNTAIL, ch-\u003eid);\ndrivers/s390/net/ctcm_fsms.c-1034-\t\t\tfsm_event(priv-\u003efsm, DEV_EVENT_TXDOWN, dev);\n--\ndrivers/s390/net/ctcm_fsms.c=1066=static void ctcm_chx_iofatal(fsm_instance *fi, int event, void *arg)\n--\ndrivers/s390/net/ctcm_fsms.c-1073-\tfsm_deltimer(\u0026ch-\u003etimer);\ndrivers/s390/net/ctcm_fsms.c:1074:\tCTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,\ndrivers/s390/net/ctcm_fsms.c-1075-\t\t\"%s: %s: %s unrecoverable channel error\",\ndrivers/s390/net/ctcm_fsms.c:1076:\t\t\tCTCM_FUNTAIL, ch-\u003eid, rd == CTCM_READ ? \"RX\" : \"TX\");\ndrivers/s390/net/ctcm_fsms.c-1077-\n--\ndrivers/s390/net/ctcm_fsms.c-1081-\t}\ndrivers/s390/net/ctcm_fsms.c:1082:\tif (rd == CTCM_READ) {\ndrivers/s390/net/ctcm_fsms.c-1083-\t\tfsm_newstate(fi, CTC_STATE_RXERR);\n--\ndrivers/s390/net/ctcm_fsms.c=1216=static void ctcmpc_chx_txdone(fsm_instance *fi, int event, void *arg)\n--\ndrivers/s390/net/ctcm_fsms.c-1232-\ndrivers/s390/net/ctcm_fsms.c:1233:\tCTCM_PR_DEBUG(\"Enter %s: %s cp:%i\\n\",\ndrivers/s390/net/ctcm_fsms.c-1234-\t\t\t__func__, dev-\u003ename, smp_processor_id());\n--\ndrivers/s390/net/ctcm_fsms.c-1240-\tif (ch-\u003eirb-\u003escsw.cmd.count != 0)\ndrivers/s390/net/ctcm_fsms.c:1241:\t\tCTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,\ndrivers/s390/net/ctcm_fsms.c-1242-\t\t\t\"%s(%s): TX not complete, remaining %d bytes\",\ndrivers/s390/net/ctcm_fsms.c:1243:\t\t\t     CTCM_FUNTAIL, dev-\u003ename, ch-\u003eirb-\u003escsw.cmd.count);\ndrivers/s390/net/ctcm_fsms.c-1244-\tfsm_deltimer(\u0026ch-\u003etimer);\n--\ndrivers/s390/net/ctcm_fsms.c-1277-\ndrivers/s390/net/ctcm_fsms.c:1278:\tCTCM_PR_DBGDATA(\"%s: building trans_skb from collect_q\"\ndrivers/s390/net/ctcm_fsms.c-1279-\t\t       \" data_space:%04x\\n\",\n--\ndrivers/s390/net/ctcm_fsms.c-1291-\ndrivers/s390/net/ctcm_fsms.c:1292:\t\tCTCM_PR_DBGDATA(\"%s: trans_skb len:%04x \\n\",\ndrivers/s390/net/ctcm_fsms.c-1293-\t\t\t\t__func__, ch-\u003etrans_skb-\u003elen);\ndrivers/s390/net/ctcm_fsms.c:1294:\t\tCTCM_PR_DBGDATA(\"%s: pdu header and data for up\"\ndrivers/s390/net/ctcm_fsms.c-1295-\t\t\t\t\" to 32 bytes sent to vtam\\n\", __func__);\ndrivers/s390/net/ctcm_fsms.c:1296:\t\tCTCM_D3_DUMP((char *)p_header, min_t(int, skb-\u003elen, 32));\ndrivers/s390/net/ctcm_fsms.c-1297-\n--\ndrivers/s390/net/ctcm_fsms.c-1319-\ndrivers/s390/net/ctcm_fsms.c:1320:\tCTCM_PR_DBGDATA(\"%s: ToVTAM_th_seq= %08x\\n\" ,\ndrivers/s390/net/ctcm_fsms.c-1321-\t\t\t\t\t__func__, ch-\u003eth_seq_num);\ndrivers/s390/net/ctcm_fsms.c-1322-\ndrivers/s390/net/ctcm_fsms.c:1323:\tCTCM_PR_DBGDATA(\"%s: trans_skb len:%04x \\n\",\ndrivers/s390/net/ctcm_fsms.c-1324-\t\t       __func__, ch-\u003etrans_skb-\u003elen);\ndrivers/s390/net/ctcm_fsms.c:1325:\tCTCM_PR_DBGDATA(\"%s: up-to-50 bytes of trans_skb \"\ndrivers/s390/net/ctcm_fsms.c-1326-\t\t\t\"data to vtam from collect_q\\n\", __func__);\ndrivers/s390/net/ctcm_fsms.c:1327:\tCTCM_D3_DUMP((char *)ch-\u003etrans_skb-\u003edata,\ndrivers/s390/net/ctcm_fsms.c-1328-\t\t\t\tmin_t(int, ch-\u003etrans_skb-\u003elen, 50));\n--\ndrivers/s390/net/ctcm_fsms.c-1332-\ndrivers/s390/net/ctcm_fsms.c:1333:\tCTCM_PR_DBGDATA(\"ccwcda=0x%p data=0x%p\\n\",\ndrivers/s390/net/ctcm_fsms.c-1334-\t\t\t(void *)(u64)dma32_to_u32(ch-\u003eccw[1].cda),\n--\ndrivers/s390/net/ctcm_fsms.c-1340-\t\tch-\u003etrans_skb = NULL;\ndrivers/s390/net/ctcm_fsms.c:1341:\t\tCTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,\ndrivers/s390/net/ctcm_fsms.c-1342-\t\t\t\"%s: %s: IDAL alloc failed\",\ndrivers/s390/net/ctcm_fsms.c:1343:\t\t\t\tCTCM_FUNTAIL, ch-\u003eid);\ndrivers/s390/net/ctcm_fsms.c-1344-\t\tfsm_event(priv-\u003empcg-\u003efsm, MPCG_EVENT_INOP, dev);\n--\ndrivers/s390/net/ctcm_fsms.c-1347-\ndrivers/s390/net/ctcm_fsms.c:1348:\tCTCM_PR_DBGDATA(\"ccwcda=0x%p data=0x%p\\n\",\ndrivers/s390/net/ctcm_fsms.c-1349-\t\t\t(void *)(u64)dma32_to_u32(ch-\u003eccw[1].cda),\n--\ndrivers/s390/net/ctcm_fsms.c-1352-\tch-\u003eccw[1].count = ch-\u003etrans_skb-\u003elen;\ndrivers/s390/net/ctcm_fsms.c:1353:\tfsm_addtimer(\u0026ch-\u003etimer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);\ndrivers/s390/net/ctcm_fsms.c-1354-\tch-\u003eprof.send_stamp = jiffies;\n--\ndrivers/s390/net/ctcm_fsms.c=1379=__context_unsafe(/* Conditional locking */)\n--\ndrivers/s390/net/ctcm_fsms.c-1389-\ndrivers/s390/net/ctcm_fsms.c:1390:\tCTCM_PR_DEBUG(\"%s: %s: cp:%i %s maxbuf : %04x, len: %04x\\n\",\ndrivers/s390/net/ctcm_fsms.c:1391:\t\t\tCTCM_FUNTAIL, dev-\u003ename, smp_processor_id(),\ndrivers/s390/net/ctcm_fsms.c-1392-\t\t\t\tch-\u003eid, ch-\u003emax_bufsize, len);\n--\ndrivers/s390/net/ctcm_fsms.c-1395-\tif (skb == NULL) {\ndrivers/s390/net/ctcm_fsms.c:1396:\t\tCTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,\ndrivers/s390/net/ctcm_fsms.c-1397-\t\t\t\"%s(%s): TRANS_SKB = NULL\",\ndrivers/s390/net/ctcm_fsms.c:1398:\t\t\t\tCTCM_FUNTAIL, dev-\u003ename);\ndrivers/s390/net/ctcm_fsms.c-1399-\t\tgoto again;\n--\ndrivers/s390/net/ctcm_fsms.c-1402-\tif (len \u003c TH_HEADER_LENGTH) {\ndrivers/s390/net/ctcm_fsms.c:1403:\t\tCTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,\ndrivers/s390/net/ctcm_fsms.c-1404-\t\t\t\t\"%s(%s): packet length %d too short\",\ndrivers/s390/net/ctcm_fsms.c:1405:\t\t\t\t\tCTCM_FUNTAIL, dev-\u003ename, len);\ndrivers/s390/net/ctcm_fsms.c-1406-\t\tpriv-\u003estats.rx_dropped++;\n--\ndrivers/s390/net/ctcm_fsms.c-1414-\t\tif (new_skb == NULL) {\ndrivers/s390/net/ctcm_fsms.c:1415:\t\t\tCTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,\ndrivers/s390/net/ctcm_fsms.c-1416-\t\t\t\t\"%s(%s): skb allocation failed\",\ndrivers/s390/net/ctcm_fsms.c:1417:\t\t\t\t\t\tCTCM_FUNTAIL, dev-\u003ename);\ndrivers/s390/net/ctcm_fsms.c-1418-\t\t\tfsm_event(priv-\u003empcg-\u003efsm, MPCG_EVENT_INOP, dev);\n--\ndrivers/s390/net/ctcm_fsms.c-1468-\ndrivers/s390/net/ctcm_fsms.c:1469:\tCTCM_PR_DEBUG(\"Exit %s: %s, ch=0x%p, id=%s\\n\",\ndrivers/s390/net/ctcm_fsms.c-1470-\t\t\t__func__, dev-\u003ename, ch, ch-\u003eid);\n--\ndrivers/s390/net/ctcm_fsms.c=1481=static void ctcmpc_chx_firstio(fsm_instance *fi, int event, void *arg)\n--\ndrivers/s390/net/ctcm_fsms.c-1487-\ndrivers/s390/net/ctcm_fsms.c:1488:\tCTCM_PR_DEBUG(\"Enter %s: id=%s, ch=0x%p\\n\",\ndrivers/s390/net/ctcm_fsms.c-1489-\t\t\t\t__func__, ch-\u003eid, ch);\ndrivers/s390/net/ctcm_fsms.c-1490-\ndrivers/s390/net/ctcm_fsms.c:1491:\tCTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_INFO,\ndrivers/s390/net/ctcm_fsms.c-1492-\t\t\t\"%s: %s: chstate:%i, grpstate:%i, prot:%i\\n\",\ndrivers/s390/net/ctcm_fsms.c:1493:\t\t\tCTCM_FUNTAIL, ch-\u003eid, fsm_getstate(fi),\ndrivers/s390/net/ctcm_fsms.c-1494-\t\t\tfsm_getstate(gptr-\u003efsm), ch-\u003eprotocol);\n--\ndrivers/s390/net/ctcm_fsms.c-1505-\tcase CTC_STATE_SETUPWAIT:\ndrivers/s390/net/ctcm_fsms.c:1506:\t\tif (CHANNEL_DIRECTION(ch-\u003eflags) == CTCM_READ) {\ndrivers/s390/net/ctcm_fsms.c-1507-\t\t\tctcmpc_chx_rxidle(fi, event, arg);\n--\ndrivers/s390/net/ctcm_fsms.c-1516-\ndrivers/s390/net/ctcm_fsms.c:1517:\tfsm_newstate(fi, (CHANNEL_DIRECTION(ch-\u003eflags) == CTCM_READ)\ndrivers/s390/net/ctcm_fsms.c-1518-\t\t     ? CTC_STATE_RXINIT : CTC_STATE_TXINIT);\n--\ndrivers/s390/net/ctcm_fsms.c-1520-done:\ndrivers/s390/net/ctcm_fsms.c:1521:\tCTCM_PR_DEBUG(\"Exit %s: id=%s, ch=0x%p\\n\",\ndrivers/s390/net/ctcm_fsms.c-1522-\t\t\t\t__func__, ch-\u003eid, ch);\n--\ndrivers/s390/net/ctcm_fsms.c=1536=__context_unsafe(/* Conditional locking */)\n--\ndrivers/s390/net/ctcm_fsms.c-1545-\tfsm_deltimer(\u0026ch-\u003etimer);\ndrivers/s390/net/ctcm_fsms.c:1546:\tCTCM_PR_DEBUG(\"%s: %s: %s: cp:%i, chstate:%i grpstate:%i\\n\",\n\n"
}

gemini-3.7-flash

null

null

							input: 18293
							output: 37
							thoughts: 17
						

Here's a summary of my thought process, as if I were considering the `drivers/s390/net/Kconfig` file:

**Investigating the s390 Network Configuration**

Okay, time to dive into the s390 network configuration. I know the standard layout, so `drivers/s390/net/Kconfig` is the obvious place to start. I'm expecting this file to define all the relevant kernel configuration options related to networking on the System z architecture. I'll be looking for things like: the various network card drivers supported, any platform-specific networking features, maybe some s390-specific protocol configurations, and likely dependency checks that pertain to the underlying hardware and s390 architecture nuances. I'll need to understand the relationships between different networking options. How are various NICs enabled/disabled? Are there any conditional dependencies? How are different networking features or protocols configured? I'll probably scan for `config` entries, looking for likely relevant symbols. Then I'll focus on relationships and context: Who uses them, and how are they combined? I'll also pay close attention to the help text associated with each option. This text will provide critical insights into the purpose and intended use of each configurable setting. I need to be sure I understand the complete picture. The goal is to fully grasp the available configuration space for networking on the s390 platform, to recognize potentially needed customization areas, and prepare myself to identify the impacts of making certain configuration changes.

{
  "File": "drivers/s390/net/Kconfig",
  "FirstLine": 1,
  "LineCount": 50
}

{
  "Contents": "   1:\t# SPDX-License-Identifier: GPL-2.0\n   2:\tmenu \"S/390 network device drivers\"\n   3:\t\tdepends on NETDEVICES \u0026\u0026 S390\n   4:\t\n   5:\tconfig CTCM\n   6:\t\tdef_tristate m\n   7:\t\tprompt \"CTC and MPC SNA device support\"\n   8:\t\tdepends on CCW \u0026\u0026 NETDEVICES\n   9:\t\thelp\n  10:\t\t  Select this option if you want to use channel-to-channel\n  11:\t\t  point-to-point networking on IBM System z.\n  12:\t\t  This device driver supports real CTC coupling using ESCON.\n  13:\t\t  It also supports virtual CTCs when running under VM.\n  14:\t\t  This driver also supports channel-to-channel MPC SNA devices.\n  15:\t\t  MPC is an SNA protocol device used by Communication Server for Linux.\n  16:\t\t  To compile as a module, choose M. The module name is ctcm.\n  17:\t\t  To compile into the kernel, choose Y.\n  18:\t\t  If you do not need any channel-to-channel connection, choose N.\n  19:\t\n  20:\tconfig SMSGIUCV\n  21:\t\tdef_tristate m\n  22:\t\tprompt \"IUCV special message support (VM only)\"\n  23:\t\tdepends on IUCV\n  24:\t\thelp\n  25:\t\t  Select this option if you want to be able to receive SMSG messages\n  26:\t\t  from other VM guest systems.\n  27:\t\n  28:\tconfig SMSGIUCV_EVENT\n  29:\t\tdef_tristate m\n  30:\t\tprompt \"Deliver IUCV special messages as uevents (VM only)\"\n  31:\t\tdepends on SMSGIUCV\n  32:\t\thelp\n  33:\t\t  Select this option to deliver CP special messages (SMSGs) as\n  34:\t\t  uevents.  The driver handles only those special messages that\n  35:\t\t  start with \"APP\".\n  36:\t\n  37:\t\t  To compile as a module, choose M. The module name is \"smsgiucv_app\".\n  38:\t\n  39:\tconfig QETH\n  40:\t\tdef_tristate y\n  41:\t\tprompt \"Gigabit Ethernet device support\"\n  42:\t\tdepends on CCW \u0026\u0026 NETDEVICES \u0026\u0026 IP_MULTICAST \u0026\u0026 QDIO \u0026\u0026 ETHERNET\n  43:\t\thelp\n  44:\t\t  This driver supports IBM's OSA Express network adapters in QDIO mode,\n  45:\t\t  HiperSockets interfaces and z/VM virtual NICs for Guest LAN and\n  46:\t\t  VSWITCH.\n  47:\t\n  48:\t\t  To compile this driver as a module, choose M.\n  49:\t\t  The module name is qeth.\n  50:\t\n"
}

gemini-3.7-flash

null

null

							input: 19389
							output: 19
							thoughts: 95
						

**Investigating S390 Network Device Drivers**

Okay, so I'm looking into the S390 network device drivers, specifically focusing on potential architecture-specific code usage. The first thing I'm checking is the `drivers/s390/net/Kconfig` file. It seems pretty straightforward: the main "S/390 network device drivers" menu is guarded by `NETDEVICES && S390`, which makes perfect sense. And then, there's `config CTCM`, which depends on `CCW && NETDEVICES`. Nothing unexpected there either.

The real question I need to answer is whether any of the low-level CTCM or FSM code is accidentally used elsewhere. Let's dig deeper. The critical check is: are the files `fsm.c`, `fsm.h`, or `ctcm_main.c` somehow being pulled into the build for non-S390 architectures? If they are, we have a problem. My next step will be to check where these files are used within the kernel and if any use outside of the S390 architecture. This is a crucial check to prevent cross-architecture dependencies and potential build errors or incorrect behavior.

{
  "Expression": "fsm_addtimer"
}

{
  "Output": "drivers/s390/net/ctcm_fsms.c=245=static void chx_txdone(fsm_instance *fi, int event, void *arg)\n--\ndrivers/s390/net/ctcm_fsms.c-306-\t\tch-\u003eccw[1].count = ch-\u003etrans_skb-\u003elen;\ndrivers/s390/net/ctcm_fsms.c:307:\t\tfsm_addtimer(\u0026ch-\u003etimer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);\ndrivers/s390/net/ctcm_fsms.c-308-\t\tch-\u003eprof.send_stamp = jiffies;\n--\ndrivers/s390/net/ctcm_fsms.c=430=static void chx_firstio(fsm_instance *fi, int event, void *arg)\n--\ndrivers/s390/net/ctcm_fsms.c-452-\t\t\t*((__u16 *)ch-\u003etrans_skb-\u003edata) = CTCM_INITIAL_BLOCKLEN;\ndrivers/s390/net/ctcm_fsms.c:453:\t\t\tfsm_addtimer(\u0026ch-\u003etimer, CTCM_TIME_5_SEC,\ndrivers/s390/net/ctcm_fsms.c-454-\t\t\t\t     CTC_EVENT_TIMER, ch);\n--\ndrivers/s390/net/ctcm_fsms.c-470-\t    (ch-\u003eprotocol != CTCM_PROTO_S390))\ndrivers/s390/net/ctcm_fsms.c:471:\t\tfsm_addtimer(\u0026ch-\u003etimer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);\ndrivers/s390/net/ctcm_fsms.c-472-\n--\ndrivers/s390/net/ctcm_fsms.c=548=__context_unsafe(/* Conditional locking */)\n--\ndrivers/s390/net/ctcm_fsms.c-560-\t}\ndrivers/s390/net/ctcm_fsms.c:561:\tfsm_addtimer(\u0026ch-\u003etimer, timeout, CTC_EVENT_TIMER, ch);\ndrivers/s390/net/ctcm_fsms.c-562-\tfsm_newstate(fi, CTC_STATE_SETUPWAIT);\n--\ndrivers/s390/net/ctcm_fsms.c=586=static void ctcm_chx_start(fsm_instance *fi, int event, void *arg)\n--\ndrivers/s390/net/ctcm_fsms.c-630-\tfsm_newstate(fi, CTC_STATE_STARTWAIT);\ndrivers/s390/net/ctcm_fsms.c:631:\tfsm_addtimer(\u0026ch-\u003etimer, 1000, CTC_EVENT_TIMER, ch);\ndrivers/s390/net/ctcm_fsms.c-632-\tspin_lock_irqsave(get_ccwdev_lock(ch-\u003ecdev), saveflags);\n--\ndrivers/s390/net/ctcm_fsms.c=650=__context_unsafe(/* Conditional locking */)\n--\ndrivers/s390/net/ctcm_fsms.c-660-\ndrivers/s390/net/ctcm_fsms.c:661:\tfsm_addtimer(\u0026ch-\u003etimer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);\ndrivers/s390/net/ctcm_fsms.c-662-\n--\ndrivers/s390/net/ctcm_fsms.c=774=static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg)\n--\ndrivers/s390/net/ctcm_fsms.c-789-\t\tfsm_deltimer(\u0026ch-\u003etimer);\ndrivers/s390/net/ctcm_fsms.c:790:\t\tfsm_addtimer(\u0026ch-\u003etimer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);\ndrivers/s390/net/ctcm_fsms.c-791-\t\tif (!IS_MPC(ch) \u0026\u0026\n--\ndrivers/s390/net/ctcm_fsms.c=824=__context_unsafe(/* Conditional locking */)\n--\ndrivers/s390/net/ctcm_fsms.c-837-\ndrivers/s390/net/ctcm_fsms.c:838:\tfsm_addtimer(\u0026ch-\u003etimer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);\ndrivers/s390/net/ctcm_fsms.c-839-\toldstate = fsm_getstate(fi);\n--\ndrivers/s390/net/ctcm_fsms.c=997=__context_unsafe(/* Conditional locking */)\n--\ndrivers/s390/net/ctcm_fsms.c-1037-\t\t}\ndrivers/s390/net/ctcm_fsms.c:1038:\t\tfsm_addtimer(\u0026ch-\u003etimer, 1000, CTC_EVENT_TIMER, ch);\ndrivers/s390/net/ctcm_fsms.c-1039-\t\tif (event == CTC_EVENT_TIMER) /* for TIMER not yet locked */\n--\ndrivers/s390/net/ctcm_fsms.c=1216=static void ctcmpc_chx_txdone(fsm_instance *fi, int event, void *arg)\n--\ndrivers/s390/net/ctcm_fsms.c-1352-\tch-\u003eccw[1].count = ch-\u003etrans_skb-\u003elen;\ndrivers/s390/net/ctcm_fsms.c:1353:\tfsm_addtimer(\u0026ch-\u003etimer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);\ndrivers/s390/net/ctcm_fsms.c-1354-\tch-\u003eprof.send_stamp = jiffies;\n--\ndrivers/s390/net/ctcm_fsms.c=1589=static void ctcmpc_chx_attn(fsm_instance *fsm, int event, void *arg)\n--\ndrivers/s390/net/ctcm_fsms.c-1606-\t\t\tfsm_deltimer(\u0026grp-\u003etimer);\ndrivers/s390/net/ctcm_fsms.c:1607:\t\t\tfsm_addtimer(\u0026grp-\u003etimer,\ndrivers/s390/net/ctcm_fsms.c-1608-\t\t\t\tMPC_XID_TIMEOUT_VALUE,\n--\ndrivers/s390/net/ctcm_fsms.c=1648=static void ctcmpc_chx_attnbusy(fsm_instance *fsm, int event, void *arg)\n--\ndrivers/s390/net/ctcm_fsms.c-1714-\t\tfsm_deltimer(\u0026grp-\u003etimer);\ndrivers/s390/net/ctcm_fsms.c:1715:\t\tfsm_addtimer(\u0026grp-\u003etimer, MPC_XID_TIMEOUT_VALUE,\ndrivers/s390/net/ctcm_fsms.c-1716-\t\t\t     MPCG_EVENT_TIMER, dev);\n--\ndrivers/s390/net/ctcm_fsms.c=1750=static void ctcmpc_chx_send_sweep(fsm_instance *fsm, int event, void *arg)\n--\ndrivers/s390/net/ctcm_fsms.c-1775-\t\t/* give the previous IO time to complete */\ndrivers/s390/net/ctcm_fsms.c:1776:\t\tfsm_addtimer(\u0026wch-\u003esweep_timer,\ndrivers/s390/net/ctcm_fsms.c-1777-\t\t\t200, CTC_EVENT_RSWEEP_TIMER, wch);\n--\ndrivers/s390/net/ctcm_fsms.c-1814-\ndrivers/s390/net/ctcm_fsms.c:1815:\tfsm_addtimer(\u0026wch-\u003etimer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, wch);\ndrivers/s390/net/ctcm_fsms.c-1816-\tfsm_newstate(wch-\u003efsm, CTC_STATE_TX);\n--\ndrivers/s390/net/ctcm_fsms.c=2105=static void dev_action_restart(fsm_instance *fi, int event, void *arg)\n--\ndrivers/s390/net/ctcm_fsms.c-2127-\t/* to sense reported when IO is aborted\t\t\t  */\ndrivers/s390/net/ctcm_fsms.c:2128:\tfsm_addtimer(\u0026priv-\u003erestart_timer, restart_timer,\ndrivers/s390/net/ctcm_fsms.c-2129-\t\t\tDEV_EVENT_START, dev);\n--\ndrivers/s390/net/ctcm_main.c=464=static int ctcm_transmit_skb(struct channel *ch, struct sk_buff *skb)\n--\ndrivers/s390/net/ctcm_main.c-567-\tfsm_newstate(ch-\u003efsm, CTC_STATE_TX);\ndrivers/s390/net/ctcm_main.c:568:\tfsm_addtimer(\u0026ch-\u003etimer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);\ndrivers/s390/net/ctcm_main.c-569-\tspin_lock_irqsave(get_ccwdev_lock(ch-\u003ecdev), saveflags);\n--\ndrivers/s390/net/ctcm_main.c=596=static void ctcmpc_send_sweep_req(struct channel *rch)\n--\ndrivers/s390/net/ctcm_main.c-631-\ndrivers/s390/net/ctcm_main.c:632:\tfsm_addtimer(\u0026ch-\u003esweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch);\ndrivers/s390/net/ctcm_main.c-633-\n--\ndrivers/s390/net/ctcm_main.c=647=static int ctcmpc_transmit_skb(struct channel *ch, struct sk_buff *skb)\n--\ndrivers/s390/net/ctcm_main.c-785-\tfsm_newstate(ch-\u003efsm, CTC_STATE_TX);\ndrivers/s390/net/ctcm_main.c:786:\tfsm_addtimer(\u0026ch-\u003etimer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);\ndrivers/s390/net/ctcm_main.c-787-\n--\ndrivers/s390/net/ctcm_mpc.c=399=void ctc_mpc_establish_connectivity(int port_num,\n--\ndrivers/s390/net/ctcm_mpc.c-468-\t\tfsm_deltimer(\u0026grp-\u003etimer);\ndrivers/s390/net/ctcm_mpc.c:469:\t\tfsm_addtimer(\u0026grp-\u003etimer, MPC_XID_TIMEOUT_VALUE,\ndrivers/s390/net/ctcm_mpc.c-470-\t\t\t\t\t\tMPCG_EVENT_TIMER, dev);\n--\ndrivers/s390/net/ctcm_mpc.c=639=static void ctcmpc_send_sweep_resp(struct channel *rch)\n--\ndrivers/s390/net/ctcm_mpc.c-664-\ndrivers/s390/net/ctcm_mpc.c:665:\tfsm_addtimer(\u0026ch-\u003esweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch);\ndrivers/s390/net/ctcm_mpc.c-666-\n--\ndrivers/s390/net/ctcm_mpc.c=1336=static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg)\n--\ndrivers/s390/net/ctcm_mpc.c-1412-\t\tfsm_deltimer(\u0026priv-\u003erestart_timer);\ndrivers/s390/net/ctcm_mpc.c:1413:\t\tfsm_addtimer(\u0026priv-\u003erestart_timer, 500, DEV_EVENT_RESTART, dev);\ndrivers/s390/net/ctcm_mpc.c-1414-\t\tfsm_newstate(grp-\u003efsm, MPCG_STATE_RESET);\n--\ndrivers/s390/net/ctcm_mpc.c-1420-\t\tfsm_deltimer(\u0026priv-\u003erestart_timer);\ndrivers/s390/net/ctcm_mpc.c:1421:\t\tfsm_addtimer(\u0026priv-\u003erestart_timer, 500, DEV_EVENT_STOP, dev);\ndrivers/s390/net/ctcm_mpc.c-1422-\t\tfsm_newstate(grp-\u003efsm, MPCG_STATE_RESET);\n--\ndrivers/s390/net/ctcm_mpc.c=1649=__context_unsafe(/* Conditional locking */)\n--\ndrivers/s390/net/ctcm_mpc.c-1780-\ndrivers/s390/net/ctcm_mpc.c:1781:\tfsm_addtimer(\u0026ch-\u003etimer, 5000 , CTC_EVENT_TIMER, ch);\ndrivers/s390/net/ctcm_mpc.c-1782-\trc = ccw_device_start(ch-\u003ecdev, \u0026ch-\u003eccw[8], 0, 0xff, 0);\n--\ndrivers/s390/net/fsm.c=165=int\ndrivers/s390/net/fsm.c:166:fsm_addtimer(fsm_timer *this, int millisec, int event, void *arg)\ndrivers/s390/net/fsm.c-167-{\n--\ndrivers/s390/net/fsm.c=197=EXPORT_SYMBOL(fsm_deltimer);\ndrivers/s390/net/fsm.c:198:EXPORT_SYMBOL(fsm_addtimer);\ndrivers/s390/net/fsm.c-199-EXPORT_SYMBOL(fsm_modtimer);\n--\ndrivers/s390/net/fsm.h=226=const char *fsm_getstate_str(fsm_instance *fi);\n--\ndrivers/s390/net/fsm.h-232- *\ndrivers/s390/net/fsm.h:233: * Prepares an fsm_timer for usage with fsm_addtimer().\ndrivers/s390/net/fsm.h-234- */\n--\ndrivers/s390/net/fsm.h=243=void fsm_deltimer(fsm_timer *timer);\n--\ndrivers/s390/net/fsm.h-245-/**\ndrivers/s390/net/fsm.h:246: * fsm_addtimer - Adds and starts a timer for an FSM instance\ndrivers/s390/net/fsm.h-247- * @timer: The timer to be added (timer-\u003efi must point to the FSM instance)\n--\ndrivers/s390/net/fsm.h-256- */\ndrivers/s390/net/fsm.h:257:int fsm_addtimer(fsm_timer *timer, int millisec, int event, void *arg);\ndrivers/s390/net/fsm.h-258-\n"
}

gemini-3.7-flash

null

null

							input: 23827
							output: 19
							thoughts: 530
						

**Analyzing Code for Fuzzing Suitability**

Okay, so I need to figure out if this code is worth fuzzing. The key is to check if the changes are specific to an architecture that's *not* the target, and if there are unreachable code paths. Let's dig in. First, I need to check where `fsm_modtimer` and other symbols are used in `drivers/s390/net/fsm.c` and where `fsm.c` is compiled. The `Makefile` confirms `fsm.o` is built if `CONFIG_CTCM` is enabled. Let's just make sure it isn't used elsewhere with a quick search. The results seem to be constrained to `drivers/s390/net/`.

Right, `drivers/s390/`... that's a red flag. Let's confirm that's S390 architecture-specific, just to be sure. My target architecture is `amd64`.

Okay, the guidelines. Unreachable execution paths are a big no-no for WorthFuzzing. Specific architecture code is another. So, let's look at the modified files: `drivers/s390/net/ctcm_main.c` and `drivers/s390/net/fsm.c`. Both of those are squarely within the `drivers/s390/net/` directory, part of the S390 subsystem. 

Let's now be certain that `CONFIG_CTCM` depends on `CONFIG_S390` or `CONFIG_CCW`. In the `Kconfig`, I can see the `menu "S/390 network device drivers"` with a dependency on `NETDEVICES && S390`. `CONFIG_CTCM` depends on `CCW && NETDEVICES`. I know that `CCW` is only available on `CONFIG_S390`. So now I need to confirm whether I can even *enable* `CONFIG_S390` or `CONFIG_CCW` on `amd64`. Let's grep for that configuration. This clearly looks like these changes are architecture specific, and will not be reached on the target architecture.

{
  "Expression": "config CCW\\b"
}

{
  "Output": "arch/s390/Kconfig=860=endmenu\narch/s390/Kconfig-861-\narch/s390/Kconfig:862:config CCW\narch/s390/Kconfig-863-\tdef_bool y\n"
}

gemini-3.7-flash

null

null

							input: 24941
							output: 122
							thoughts: 382
						

**Analysis of s390-Specific Code Changes**

Okay, so I'm looking at this patch and immediately, I see that `drivers/s390/net/ctcm_main.c` and `drivers/s390/net/fsm.c` are the files being modified. I know from my familiarity with the kernel build system that `CONFIG_CCW` is defined in `arch/s390/Kconfig`, and the networking Kconfig in `drivers/s390/net/Kconfig` depends on `S390`. This means these files are *exclusively* built for the s390 architecture. They won't even compile, let alone run, on my target architecture, which is amd64.

This falls squarely under the "Unreachable execution paths" category as per the documentation. Since the target architecture is amd64, this code is unreachable, so `WorthFuzzing` has to be `false`.

Just to be thorough, I'll quickly double-check the patch diff to confirm, and yes, it's just those two s390-specific files. Perfect.

Now, let's nail down the output. I need to generate the `set-results` response. I know the fields I need: `WorthFuzzing`, `Reasoning`, `FocusSymbols`, and `EnableConfigs`.

*   `WorthFuzzing`: Definitely `false`.
*   `Reasoning`: Okay, the reasoning needs to be clear and concise. I'll phrase it as: "The patch modifies code in `drivers/s390/net/ctcm_main.c` and `drivers/s390/net/fsm.c` (CONFIG_CTCM), which is specific to the s390 architecture (depends on CONFIG_S390 and CONFIG_CCW) and cannot be compiled or executed on the target architecture (amd64)."
*   `FocusSymbols`: Since the code is not targeted, I'm going to pass an empty array, `[]`.
*   `EnableConfigs`: Also, as it's not worth fuzzing, I'll pass an empty array, `[]`.

Great. I need to make sure I'm following the convention of passing empty arrays for `FocusSymbols` and `EnableConfigs` when `WorthFuzzing` is `false`. That should be it.

{
  "EnableConfigs": [],
  "FocusSymbols": [],
  "Reasoning": "The patch modifies the IBM S/390 CTC/MPC network device driver and finite state machine helper in drivers/s390/net/ctcm_main.c and drivers/s390/net/fsm.c. This code is exclusive to the s390 architecture (depends on CONFIG_S390 and CONFIG_CCW) and is structurally unreachable on the target architecture (amd64).",
  "WorthFuzzing": false
}

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch modifies the IBM S/390 CTC/MPC network device driver and finite state machine helper in drivers/s390/net/ctcm_main.c and drivers/s390/net/fsm.c. This code is exclusive to the s390 architecture (depends on CONFIG_S390 and CONFIG_CCW) and is structurally unreachable on the target architecture (amd64).",
  "WorthFuzzing": false
}

{
  "WorthFuzzing": false
}

null