wifi: cfg80211: Add missing lock in cfg80211_check_and_end_cac()

Callers of wdev_chandef() must hold the wiphy mutex.

But the worker cfg80211_propagate_cac_done_wk() never takes the lock.
Which triggers the warning below with the mesh_peer_connected_dfs
test from hostapd and not (yet) released mac80211 code changes:

WARNING: CPU: 0 PID: 495 at net/wireless/chan.c:1552 wdev_chandef+0x60/0x165
Modules linked in:
CPU: 0 UID: 0 PID: 495 Comm: kworker/u4:2 Not tainted 6.14.0-rc5-wt-g03960e6f9d47 #33 13c287eeabfe1efea01c0bcc863723ab082e17cf
Workqueue: cfg80211 cfg80211_propagate_cac_done_wk
Stack:
 00000000 00000001 ffffff00 6093267c
 00000000 6002ec30 6d577c50 60037608
 00000000 67e8d108 6063717b 00000000
Call Trace:
 [<6002ec30>] ? _printk+0x0/0x98
 [<6003c2b3>] show_stack+0x10e/0x11a
 [<6002ec30>] ? _printk+0x0/0x98
 [<60037608>] dump_stack_lvl+0x71/0xb8
 [<6063717b>] ? wdev_chandef+0x60/0x165
 [<6003766d>] dump_stack+0x1e/0x20
 [<6005d1b7>] __warn+0x101/0x20f
 [<6005d3a8>] warn_slowpath_fmt+0xe3/0x15d
 [<600b0c5c>] ? mark_lock.part.0+0x0/0x4ec
 [<60751191>] ? __this_cpu_preempt_check+0x0/0x16
 [<600b11a2>] ? mark_held_locks+0x5a/0x6e
 [<6005d2c5>] ? warn_slowpath_fmt+0x0/0x15d
 [<60052e53>] ? unblock_signals+0x3a/0xe7
 [<60052f2d>] ? um_set_signals+0x2d/0x43
 [<60751191>] ? __this_cpu_preempt_check+0x0/0x16
 [<607508b2>] ? lock_is_held_type+0x207/0x21f
 [<6063717b>] wdev_chandef+0x60/0x165
 [<605f89b4>] regulatory_propagate_dfs_state+0x247/0x43f
 [<60052f00>] ? um_set_signals+0x0/0x43
 [<605e6bfd>] cfg80211_propagate_cac_done_wk+0x3a/0x4a
 [<6007e460>] process_scheduled_works+0x3bc/0x60e
 [<6007d0ec>] ? move_linked_works+0x4d/0x81
 [<6007d120>] ? assign_work+0x0/0xaa
 [<6007f81f>] worker_thread+0x220/0x2dc
 [<600786ef>] ? set_pf_worker+0x0/0x57
 [<60087c96>] ? to_kthread+0x0/0x43
 [<6008ab3c>] kthread+0x2d3/0x2e2
 [<6007f5ff>] ? worker_thread+0x0/0x2dc
 [<6006c05b>] ? calculate_sigpending+0x0/0x56
 [<6003b37d>] new_thread_handler+0x4a/0x64
irq event stamp: 614611
hardirqs last  enabled at (614621): [<00000000600bc96b>] __up_console_sem+0x82/0xaf
hardirqs last disabled at (614630): [<00000000600bc92c>] __up_console_sem+0x43/0xaf
softirqs last  enabled at (614268): [<00000000606c55c6>] __ieee80211_wake_queue+0x933/0x985
softirqs last disabled at (614266): [<00000000606c52d6>] __ieee80211_wake_queue+0x643/0x985

Fixes: 26ec17a ("cfg80211: Fix radar event during another phy CAC")
Signed-off-by: Alexander Wetzel <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Johannes Berg <[email protected]>

Author: alexw65500

net/wireless/reg.c

@@ -4229,6 +4229,8 @@ static void cfg80211_check_and_end_cac(struct cfg80211_registered_device *rdev)
 	struct wireless_dev *wdev;
 	unsigned int link_id;
 
+	guard(wiphy)(&rdev->wiphy);
+
 	/* If we finished CAC or received radar, we should end any
 	 * CAC running on the same channels.
 	 * the check !cfg80211_chandef_dfs_usable contain 2 options: