ath9k: Fix inconsistency between txq->stopped and the actual queue state

Sometimes txq state(txq->stopped) can be marked as started but the actual
queue may not be started (in ATH_WIPHY_SCAN state, for example). Fix this.
Signed-off-by: Vasanthakumar Thiagarajan <vasanth@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/ath9k/ath9k.h

@@ -687,7 +687,7 @@ bool ath9k_all_wiphys_idle(struct ath_softc *sc);
 void ath9k_set_wiphy_idle(struct ath_wiphy *aphy, bool idle);
 
 void ath_mac80211_stop_queue(struct ath_softc *sc, u16 skb_queue);
-void ath_mac80211_start_queue(struct ath_softc *sc, u16 skb_queue);
+bool ath_mac80211_start_queue(struct ath_softc *sc, u16 skb_queue);
 
 void ath_start_rfkill_poll(struct ath_softc *sc);
 extern void ath9k_rfkill_poll_state(struct ieee80211_hw *hw);

drivers/net/wireless/ath/ath9k/virtual.c

@@ -695,16 +695,18 @@ void ath9k_set_wiphy_idle(struct ath_wiphy *aphy, bool idle)
 		  idle ? "idle" : "not-idle");
 }
 /* Only bother starting a queue on an active virtual wiphy */
-void ath_mac80211_start_queue(struct ath_softc *sc, u16 skb_queue)
+bool ath_mac80211_start_queue(struct ath_softc *sc, u16 skb_queue)
 {
 	struct ieee80211_hw *hw = sc->pri_wiphy->hw;
 	unsigned int i;
+	bool txq_started = false;
 
 	spin_lock_bh(&sc->wiphy_lock);
 
 	/* Start the primary wiphy */
 	if (sc->pri_wiphy->state == ATH_WIPHY_ACTIVE) {
 		ieee80211_wake_queue(hw, skb_queue);
+		txq_started = true;
 		goto unlock;
 	}
 
@@ -718,11 +720,13 @@ void ath_mac80211_start_queue(struct ath_softc *sc, u16 skb_queue)
 
 		hw = aphy->hw;
 		ieee80211_wake_queue(hw, skb_queue);
+		txq_started = true;
 		break;
 	}
 
 unlock:
 	spin_unlock_bh(&sc->wiphy_lock);
+	return txq_started;
 }
 
 /* Go ahead and propagate information to all virtual wiphys, it won't hurt */

drivers/net/wireless/ath/ath9k/xmit.c

@@ -2077,8 +2077,8 @@ static void ath_wake_mac80211_queue(struct ath_softc *sc, struct ath_txq *txq)
 
 	spin_lock_bh(&txq->axq_lock);
 	if (txq->stopped && sc->tx.pending_frames[qnum] < ATH_MAX_QDEPTH) {
-		ath_mac80211_start_queue(sc, qnum);
-		txq->stopped = 0;
+		if (ath_mac80211_start_queue(sc, qnum))
+			txq->stopped = 0;
 	}
 	spin_unlock_bh(&txq->axq_lock);
 }