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wifi: cfg80211: make cookie counter atomic

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The cookie counter is currently protected by the
wiphy mutex, but in order to be able to transmit
management frames without holding that, we need
to assign cookies atomically.

Link: https://patch.msgid.link/20261009201417.ec1dbc786a60.I83ec404d833100a798181234c797c558400c7145@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2026-10-09 20:10:07 +02:00
parent 3938d944e8
commit fd6bcb455b
1 changed files with 5 additions and 3 deletions
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8
net/wireless/core.h
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@ -83,7 +83,9 @@ struct cfg80211_registered_device {
/* protected by RTNL only */
int num_running_ifaces;
int num_running_monitor_ifaces;
u64 cookie_counter;
/* atomic for unlocked users */
atomic64_t cookie_counter;
/* BSSes/scanning */
spinlock_t bss_lock;
@ -171,10 +173,10 @@ cfg80211_rdev_free_wowlan(struct cfg80211_registered_device *rdev)
static inline u64 cfg80211_assign_cookie(struct cfg80211_registered_device *rdev)
{
u64 r = ++rdev->cookie_counter;
u64 r = atomic64_inc_return(&rdev->cookie_counter);
if (WARN_ON(r == 0))
r = ++rdev->cookie_counter;
r = atomic64_inc_return(&rdev->cookie_counter);
return r;
}