ath9k: Check early for HW reset

chan_lock is not required for checking if
we are in the middle of a HW reset, so do it
early. This also removes the small window
where the lock is dropped and reacquired.
Signed-off-by: Sujith Manoharan <c_manoha@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

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

@@ -1839,15 +1839,17 @@ void ath_txq_schedule(struct ath_softc *sc, struct ath_txq *txq)
 	if (txq->mac80211_qnum < 0)
 		return;
 
+	if (test_bit(ATH_OP_HW_RESET, &common->op_flags))
+		return;
+
 	spin_lock_bh(&sc->chan_lock);
 	ac_list = &sc->cur_chan->acq[txq->mac80211_qnum];
-	spin_unlock_bh(&sc->chan_lock);
 
-	if (test_bit(ATH_OP_HW_RESET, &common->op_flags) ||
-	    list_empty(ac_list))
+	if (list_empty(ac_list)) {
+		spin_unlock_bh(&sc->chan_lock);
 		return;
+	}
 
-	spin_lock_bh(&sc->chan_lock);
 	rcu_read_lock();
 
 	last_ac = list_entry(ac_list->prev, struct ath_atx_ac, list);