ath9k: optimize the hardware hang check

Since it's only called when beacons are stuck, move it to the SWBA handler
tasklet, to avoid doing redundant checks on every single interrupt.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

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

@@ -369,6 +369,9 @@ void ath_beacon_tasklet(unsigned long data)
 	if (ath9k_hw_numtxpending(ah, sc->beacon.beaconq) != 0) {
 		sc->beacon.bmisscnt++;
 
+		if (!ath9k_hw_check_alive(ah))
+			ieee80211_queue_work(sc->hw, &sc->hw_check_work);
+
 		if (sc->beacon.bmisscnt < BSTUCK_THRESH * sc->nbcnvifs) {
 			ath_dbg(common, BSTUCK,
 				"missed %u consecutive beacons\n",

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

@@ -692,17 +692,6 @@ void ath9k_tasklet(unsigned long data)
 		goto out;
 	}
 
-	/*
-	 * Only run the baseband hang check if beacons stop working in AP or
-	 * IBSS mode, because it has a high false positive rate. For station
-	 * mode it should not be necessary, since the upper layers will detect
-	 * this through a beacon miss automatically and the following channel
-	 * change will trigger a hardware reset anyway
-	 */
-	if (ath9k_hw_numtxpending(ah, sc->beacon.beaconq) != 0 &&
-	    !ath9k_hw_check_alive(ah))
-		ieee80211_queue_work(sc->hw, &sc->hw_check_work);
-
 	if ((status & ATH9K_INT_TSFOOR) && sc->ps_enabled) {
 		/*
 		 * TSF sync does not look correct; remain awake to sync with