diff --git a/[refs] b/[refs]
index 0f568b7af7f1..25a0db02e4c3 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 01486c5ad388c8a38f2e075666e8c2ee32bda4b6
+refs/heads/master: 66578c0a8cb8c34ef284acf34e05f2d8e7416ee1
diff --git a/trunk/drivers/net/wireless/brcm80211/brcmsmac/mac80211_if.c b/trunk/drivers/net/wireless/brcm80211/brcmsmac/mac80211_if.c
index f8e2591961ab..b5b4487006f3 100644
--- a/trunk/drivers/net/wireless/brcm80211/brcmsmac/mac80211_if.c
+++ b/trunk/drivers/net/wireless/brcm80211/brcmsmac/mac80211_if.c
@@ -362,8 +362,10 @@ brcms_ops_add_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
 		return -EOPNOTSUPP;
 	}
 
+	spin_lock_bh(&wl->lock);
 	wl->mute_tx = false;
 	brcms_c_mute(wl->wlc, false);
+	spin_unlock_bh(&wl->lock);
 
 	return 0;
 }