ath10k: fix possible deadlock

It was possible to have a deadlock due to inverted
locking of local->iflist_mtx and
ath10k->conf_mutex.

Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>

diff --git a/drivers/net/wireless/ath/ath10k/mac.c b/drivers/net/wireless/ath/ath10k/mac.c
index da5c333..608e240 100644 (file)
--- a/drivers/net/wireless/ath/ath10k/mac.c
+++ b/drivers/net/wireless/ath/ath10k/mac.c
@@ -2581,8 +2581,9 @@ static int ath10k_set_rts_threshold(struct ieee80211_hw *hw, u32 value)
        ar_iter.ar = ar;
 
        mutex_lock(&ar->conf_mutex);
-       ieee80211_iterate_active_interfaces(hw, IEEE80211_IFACE_ITER_RESUME_ALL,
-                                           ath10k_set_rts_iter, &ar_iter);
+       ieee80211_iterate_active_interfaces_atomic(
+               hw, IEEE80211_IFACE_ITER_RESUME_ALL,
+               ath10k_set_rts_iter, &ar_iter);
        mutex_unlock(&ar->conf_mutex);
 
        return ar_iter.ret;
@@ -2622,8 +2623,9 @@ static int ath10k_set_frag_threshold(struct ieee80211_hw *hw, u32 value)
        ar_iter.ar = ar;
 
        mutex_lock(&ar->conf_mutex);
-       ieee80211_iterate_active_interfaces(hw, IEEE80211_IFACE_ITER_RESUME_ALL,
-                                           ath10k_set_frag_iter, &ar_iter);
+       ieee80211_iterate_active_interfaces_atomic(
+               hw, IEEE80211_IFACE_ITER_RESUME_ALL,
+               ath10k_set_frag_iter, &ar_iter);
        mutex_unlock(&ar->conf_mutex);
 
        return ar_iter.ret;