mac80211: better fix for conn_mon_timer running after disassociate

Is still possible to schedule conn_mon_timer after disassociate from
ieee80211_sta_tx_notify() and ieee80211_offchannel_ps_disable().

Move disassociate check to ieee80211_sta_reset_conn_monitor() to cover
all these cases, and add unlikely since in most the time we call
ieee80211_sta_reset_conn_monitor() when associated.
Signed-off-by: NStanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

net/mac80211/mlme.c

@@ -145,6 +145,9 @@ void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
 {
 	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 
+	if (unlikely(!sdata->u.mgd.associated))
+		return;
+
 	if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 		return;
 
@@ -1083,12 +1086,6 @@ void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
 	if (is_multicast_ether_addr(hdr->addr1))
 		return;
 
-	/*
-	 * In case we receive frames after disassociation.
-	 */
-	if (!sdata->u.mgd.associated)
-		return;
-
 	ieee80211_sta_reset_conn_monitor(sdata);
 }