diff --git a/[refs] b/[refs]
index c645780dfddc..d008a18eca04 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 0b7dff4faed07f55be2a98dd0eafc02623174236
+refs/heads/master: 50c16e2251b63224c05e35d80d434a479a312b4a
diff --git a/trunk/net/mac80211/agg-tx.c b/trunk/net/mac80211/agg-tx.c
index 4152ed1034b8..eb9df22418f0 100644
--- a/trunk/net/mac80211/agg-tx.c
+++ b/trunk/net/mac80211/agg-tx.c
@@ -445,7 +445,7 @@ int ieee80211_start_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid,
 
 	trace_api_start_tx_ba_session(pubsta, tid);
 
-	if (WARN_ON(!local->ops->ampdu_action))
+	if (WARN_ON_ONCE(!local->ops->ampdu_action))
 		return -EINVAL;
 
 	if ((tid >= IEEE80211_NUM_TIDS) ||