mac80211: disable power save if an infra AP vif exists

PS should not be enabled if an infra AP vif exists in
the interface list. So while recalculating PS,
AP vif type should be taken into account.
Reviewed-by: NJohannes Berg <johannes@sipsolutions.net>
Signed-off-by: NRajkumar Manoharan <rmanoharan@atheros.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

net/mac80211/mlme.c

@@ -601,6 +601,14 @@ void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 	list_for_each_entry(sdata, &local->interfaces, list) {
 		if (!ieee80211_sdata_running(sdata))
 			continue;
+		if (sdata->vif.type == NL80211_IFTYPE_AP) {
+			/* If an AP vif is found, then disable PS
+			 * by setting the count to zero thereby setting
+			 * ps_sdata to NULL.
+			 */
+			count = 0;
+			break;
+		}
 		if (sdata->vif.type != NL80211_IFTYPE_STATION)
 			continue;
 		found = sdata;