From: Felix Fietkau <nbd@openwrt.org>
Date: Mon, 27 Oct 2014 11:50:28 +0100
Subject: [PATCH] mac80211: flush keys for AP mode on ieee80211_do_stop

Userspace can add keys to an AP mode interface before start_ap has been
called. If there have been no calls to start_ap/stop_ap in the mean
time, the keys will still be around when the interface is brought down.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
---

--- a/net/mac80211/iface.c
+++ b/net/mac80211/iface.c
@@ -931,9 +931,6 @@ static void ieee80211_do_stop(struct iee
 		 * another CPU.
 		 */
 		ieee80211_free_keys(sdata, true);
-
-		/* fall through */
-	case NL80211_IFTYPE_AP:
 		skb_queue_purge(&sdata->skb_queue);
 	}