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wifi: iwlegacy: add missing mutex protection in il3945_store_measurement()

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il3945_store_measurement() calls il3945_get_measurement() which internally
calls il_send_cmd_sync() without holding il->mutex. However,
il_send_cmd_sync() has lockdep_assert_held(&il->mutex) indicating that
callers must hold this lock.

Other sysfs store functions in the same file properly acquire the mutex:
- il3945_store_flags() acquires mutex at 3945-mac.c:3110
- il3945_store_filter_flags() acquires mutex at 3945-mac.c:3144

Add mutex_lock()/mutex_unlock() around the il3945_get_measurement() call
in the sysfs store function to fix the missing lock protection.

Signed-off-by: Ziyi Guo <n7l8m4@u.northwestern.edu>
Acked-by: Stanislaw Gruszka <stf_xl@wp.pl>
Link: https://patch.msgid.link/20260125193005.1090429-1-n7l8m4@u.northwestern.edu
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Ziyi Guo 2026-01-25 19:30:05 +00:00 committed by Johannes Berg
parent 95110e5736
commit 4dd1dda652
1 changed files with 2 additions and 0 deletions
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2
drivers/net/wireless/intel/iwlegacy/3945-mac.c
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@ -3224,7 +3224,9 @@ il3945_store_measurement(struct device *d, struct device_attribute *attr,
D_INFO("Invoking measurement of type %d on " "channel %d (for '%s')\n",
type, params.channel, buf);
mutex_lock(&il->mutex);
il3945_get_measurement(il, &params, type);
mutex_unlock(&il->mutex);
return count;
}