wlcore: don't switch channels on disconnected STA vifs

Sending the FW a channel switch command on a disconnected
vif may result in a beacon loss event. Avoid this corner case.

Signed-off-by: Arik Nemtsov <arik@wizery.com>
Signed-off-by: Eliad Peller <eliad@wizery.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ti/wlcore/main.c

@@ -5192,6 +5192,10 @@ static void wl12xx_op_channel_switch(struct ieee80211_hw *hw,
 	if (unlikely(wl->state == WLCORE_STATE_OFF)) {
 		wl12xx_for_each_wlvif_sta(wl, wlvif) {
 			struct ieee80211_vif *vif = wl12xx_wlvif_to_vif(wlvif);
+
+			if (!test_bit(WLVIF_FLAG_STA_ASSOCIATED, &wlvif->flags))
+				continue;
+
 			ieee80211_chswitch_done(vif, false);
 		}
 		goto out;
@@ -5207,6 +5211,9 @@ static void wl12xx_op_channel_switch(struct ieee80211_hw *hw,
 	wl12xx_for_each_wlvif_sta(wl, wlvif) {
 		unsigned long delay_usec;
 
+		if (!test_bit(WLVIF_FLAG_STA_ASSOCIATED, &wlvif->flags))
+			continue;
+
 		ret = wl->ops->channel_switch(wl, wlvif, ch_switch);
 		if (ret)
 			goto out_sleep;