wifi: ath12k: avoid deadlock by change ieee80211_queue_work for regd_update_work

Deadlock is easily happened while shutdown wlan interface such as run
"ifconfig wlan0 down".

The reason is because when ar->regd_update_work is ran, it will
call wiphy_lock(ar->hw->wiphy) in function ath12k_regd_update() which
is running in workqueue of ieee80211_local queued by ieee80211_queue_work().
Another thread from "ifconfig wlan0 down" will also accuqire the lock
by wiphy_lock(sdata->local->hw.wiphy) in function ieee80211_stop(), and
then it call ieee80211_stop_device() to flush_workqueue(local->workqueue),
this will wait the workqueue of ieee80211_local finished. Then deadlock
will happen easily if the two thread run meanwhile.

Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0-03427-QCAHMTSWPL_V1.0_V2.0_SILICONZ-1.15378.4

Signed-off-by: Wen Gong <quic_wgong@quicinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/20230718024724.29120-1-quic_wgong@quicinc.com

diff --git a/drivers/net/wireless/ath/ath12k/wmi.c b/drivers/net/wireless/ath/ath12k/wmi.c
index fab4d33..9ed33e2 100644 (file)
--- a/drivers/net/wireless/ath/ath12k/wmi.c
+++ b/drivers/net/wireless/ath/ath12k/wmi.c
@@ -5473,7 +5473,7 @@ static int ath12k_reg_chan_list_event(struct ath12k_base *ab, struct sk_buff *sk
                ar = ab->pdevs[pdev_idx].ar;
                kfree(ab->new_regd[pdev_idx]);
                ab->new_regd[pdev_idx] = regd;
-               ieee80211_queue_work(ar->hw, &ar->regd_update_work);
+               queue_work(ab->workqueue, &ar->regd_update_work);
        } else {
                /* Multiple events for the same *ar is not expected. But we
                 * can still clear any previously stored default_regd if we