openwrt-xburst/package/mac80211/patches/562-ath9k_add_idle_hack.patch

--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -1087,6 +1087,7 @@ static void ath9k_remove_interface(struc
 	ath9k_calculate_summary_state(hw, NULL);
 
 	mutex_unlock(&sc->mutex);
+	ath9k_config(hw, IEEE80211_CONF_CHANGE_IDLE);
 	ath9k_ps_restore(sc);
 }
 
@@ -1139,7 +1140,8 @@ int ath9k_config(struct ieee80211_hw *hw
 	mutex_lock(&sc->mutex);
 
 	if (changed & IEEE80211_CONF_CHANGE_IDLE) {
-		sc->ps_idle = !!(conf->flags & IEEE80211_CONF_IDLE);
+		sc->ps_idle = !!(conf->flags & IEEE80211_CONF_IDLE) &&
+			      !sc->nvifs;
 		if (sc->ps_idle) {
 			ath_cancel_work(sc);
 			ath9k_stop_btcoex(sc);