openwrtv4/package/mac80211/patches/581-ath9k_use_reset_work.patch

--- a/drivers/net/wireless/ath/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
@@ -429,6 +429,7 @@ void ath9k_set_beaconing_status(struct a
 
 #define ATH_PAPRD_TIMEOUT	100 /* msecs */
 
+void ath_reset_work(struct work_struct *work);
 void ath_hw_check(struct work_struct *work);
 void ath_hw_pll_work(struct work_struct *work);
 void ath_paprd_calibrate(struct work_struct *work);
@@ -559,6 +560,7 @@ struct ath_ant_comb {
 #define SC_OP_RXFLUSH                BIT(7)
 #define SC_OP_LED_ASSOCIATED         BIT(8)
 #define SC_OP_LED_ON                 BIT(9)
+#define SC_OP_HW_RESET               BIT(10)
 #define SC_OP_TSF_RESET              BIT(11)
 #define SC_OP_BT_PRIORITY_DETECTED   BIT(12)
 #define SC_OP_BT_SCAN		     BIT(13)
@@ -609,6 +611,7 @@ struct ath_softc {
 	struct mutex mutex;
 	struct work_struct paprd_work;
 	struct work_struct hw_check_work;
+	struct work_struct hw_reset_work;
 	struct completion paprd_complete;
 
 	unsigned int hw_busy_count;
@@ -655,7 +658,6 @@ struct ath_softc {
 };
 
 void ath9k_tasklet(unsigned long data);
-int ath_reset(struct ath_softc *sc, bool retry_tx);
 int ath_cabq_update(struct ath_softc *);
 
 static inline void ath_read_cachesize(struct ath_common *common, int *csz)
--- a/drivers/net/wireless/ath/ath9k/beacon.c
+++ b/drivers/net/wireless/ath/ath9k/beacon.c
@@ -386,9 +386,7 @@ void ath_beacon_tasklet(unsigned long da
 			ath_dbg(common, ATH_DBG_BSTUCK,
 				"beacon is officially stuck\n");
 			sc->sc_flags |= SC_OP_TSF_RESET;
-			spin_lock(&sc->sc_pcu_lock);
-			ath_reset(sc, true);
-			spin_unlock(&sc->sc_pcu_lock);
+			ieee80211_queue_work(sc->hw, &sc->hw_reset_work);
 		}
 
 		return;
--- a/drivers/net/wireless/ath/ath9k/init.c
+++ b/drivers/net/wireless/ath/ath9k/init.c
@@ -776,6 +776,7 @@ int ath9k_init_device(u16 devid, struct 
 			goto error_world;
 	}
 
+	INIT_WORK(&sc->hw_reset_work, ath_reset_work);
 	INIT_WORK(&sc->hw_check_work, ath_hw_check);
 	INIT_WORK(&sc->paprd_work, ath_paprd_calibrate);
 	INIT_DELAYED_WORK(&sc->hw_pll_work, ath_hw_pll_work);
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -236,6 +236,7 @@ static int ath_set_channel(struct ath_so
 	del_timer_sync(&common->ani.timer);
 	cancel_work_sync(&sc->paprd_work);
 	cancel_work_sync(&sc->hw_check_work);
+	cancel_work_sync(&sc->hw_reset_work);
 	cancel_delayed_work_sync(&sc->tx_complete_work);
 	cancel_delayed_work_sync(&sc->hw_pll_work);
 
@@ -595,74 +596,6 @@ static void ath_node_detach(struct ath_s
 		ath_tx_node_cleanup(sc, an);
 }
 
-void ath_hw_check(struct work_struct *work)
-{
-	struct ath_softc *sc = container_of(work, struct ath_softc, hw_check_work);
-	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
-	unsigned long flags;
-	int busy;
-
-	ath9k_ps_wakeup(sc);
-	if (ath9k_hw_check_alive(sc->sc_ah))
-		goto out;
-
-	spin_lock_irqsave(&common->cc_lock, flags);
-	busy = ath_update_survey_stats(sc);
-	spin_unlock_irqrestore(&common->cc_lock, flags);
-
-	ath_dbg(common, ATH_DBG_RESET, "Possible baseband hang, "
-		"busy=%d (try %d)\n", busy, sc->hw_busy_count + 1);
-	if (busy >= 99) {
-		if (++sc->hw_busy_count >= 3) {
-			spin_lock_bh(&sc->sc_pcu_lock);
-			ath_reset(sc, true);
-			spin_unlock_bh(&sc->sc_pcu_lock);
-		}
-	} else if (busy >= 0)
-		sc->hw_busy_count = 0;
-
-out:
-	ath9k_ps_restore(sc);
-}
-
-static void ath_hw_pll_rx_hang_check(struct ath_softc *sc, u32 pll_sqsum)
-{
-	static int count;
-	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
-
-	if (pll_sqsum >= 0x40000) {
-		count++;
-		if (count == 3) {
-			/* Rx is hung for more than 500ms. Reset it */
-			ath_dbg(common, ATH_DBG_RESET,
-				"Possible RX hang, resetting");
-			spin_lock_bh(&sc->sc_pcu_lock);
-			ath_reset(sc, true);
-			spin_unlock_bh(&sc->sc_pcu_lock);
-			count = 0;
-		}
-	} else
-		count = 0;
-}
-
-void ath_hw_pll_work(struct work_struct *work)
-{
-	struct ath_softc *sc = container_of(work, struct ath_softc,
-					    hw_pll_work.work);
-	u32 pll_sqsum;
-
-	if (AR_SREV_9485(sc->sc_ah)) {
-
-		ath9k_ps_wakeup(sc);
-		pll_sqsum = ar9003_get_pll_sqsum_dvc(sc->sc_ah);
-		ath9k_ps_restore(sc);
-
-		ath_hw_pll_rx_hang_check(sc, pll_sqsum);
-
-		ieee80211_queue_delayed_work(sc->hw, &sc->hw_pll_work, HZ/5);
-	}
-}
-
 
 void ath9k_tasklet(unsigned long data)
 {
@@ -675,9 +608,7 @@ void ath9k_tasklet(unsigned long data)
 
 	if ((status & ATH9K_INT_FATAL) ||
 	    (status & ATH9K_INT_BB_WATCHDOG)) {
-		spin_lock(&sc->sc_pcu_lock);
-		ath_reset(sc, true);
-		spin_unlock(&sc->sc_pcu_lock);
+		ieee80211_queue_work(sc->hw, &sc->hw_reset_work);
 		return;
 	}
 
@@ -968,13 +899,14 @@ void ath_radio_disable(struct ath_softc 
 	ath9k_ps_restore(sc);
 }
 
-int ath_reset(struct ath_softc *sc, bool retry_tx)
+static int ath_reset(struct ath_softc *sc, bool retry_tx)
 {
 	struct ath_hw *ah = sc->sc_ah;
 	struct ath_common *common = ath9k_hw_common(ah);
 	struct ieee80211_hw *hw = sc->hw;
 	int r;
 
+	sc->sc_flags &= ~SC_OP_HW_RESET;
 	sc->hw_busy_count = 0;
 
 	/* Stop ANI */
@@ -1035,6 +967,84 @@ int ath_reset(struct ath_softc *sc, bool
 	return r;
 }
 
+void ath_reset_work(struct work_struct *work)
+{
+	struct ath_softc *sc = container_of(work, struct ath_softc, hw_reset_work);
+
+	spin_lock_bh(&sc->sc_pcu_lock);
+	ath_reset(sc, true);
+	spin_unlock_bh(&sc->sc_pcu_lock);
+}
+
+void ath_hw_check(struct work_struct *work)
+{
+	struct ath_softc *sc = container_of(work, struct ath_softc, hw_check_work);
+	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
+	unsigned long flags;
+	int busy;
+
+	ath9k_ps_wakeup(sc);
+	if (ath9k_hw_check_alive(sc->sc_ah))
+		goto out;
+
+	spin_lock_irqsave(&common->cc_lock, flags);
+	busy = ath_update_survey_stats(sc);
+	spin_unlock_irqrestore(&common->cc_lock, flags);
+
+	ath_dbg(common, ATH_DBG_RESET, "Possible baseband hang, "
+		"busy=%d (try %d)\n", busy, sc->hw_busy_count + 1);
+	if (busy >= 99) {
+		if (++sc->hw_busy_count >= 3) {
+			spin_lock_bh(&sc->sc_pcu_lock);
+			ath_reset(sc, true);
+			spin_unlock_bh(&sc->sc_pcu_lock);
+		}
+
+	} else if (busy >= 0)
+		sc->hw_busy_count = 0;
+
+out:
+	ath9k_ps_restore(sc);
+}
+
+static void ath_hw_pll_rx_hang_check(struct ath_softc *sc, u32 pll_sqsum)
+{
+	static int count;
+	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
+
+	if (pll_sqsum >= 0x40000) {
+		count++;
+		if (count == 3) {
+			/* Rx is hung for more than 500ms. Reset it */
+			ath_dbg(common, ATH_DBG_RESET,
+				"Possible RX hang, resetting");
+			spin_lock_bh(&sc->sc_pcu_lock);
+			ath_reset(sc, true);
+			spin_unlock_bh(&sc->sc_pcu_lock);
+			count = 0;
+		}
+	} else
+		count = 0;
+}
+
+void ath_hw_pll_work(struct work_struct *work)
+{
+	struct ath_softc *sc = container_of(work, struct ath_softc,
+					    hw_pll_work.work);
+	u32 pll_sqsum;
+
+	if (AR_SREV_9485(sc->sc_ah)) {
+
+		ath9k_ps_wakeup(sc);
+		pll_sqsum = ar9003_get_pll_sqsum_dvc(sc->sc_ah);
+		ath9k_ps_restore(sc);
+
+		ath_hw_pll_rx_hang_check(sc, pll_sqsum);
+
+		ieee80211_queue_delayed_work(sc->hw, &sc->hw_pll_work, HZ/5);
+	}
+}
+
 /**********************/
 /* mac80211 callbacks */
 /**********************/
@@ -1227,6 +1237,7 @@ static void ath9k_stop(struct ieee80211_
 	cancel_delayed_work_sync(&sc->hw_pll_work);
 	cancel_work_sync(&sc->paprd_work);
 	cancel_work_sync(&sc->hw_check_work);
+	cancel_work_sync(&sc->hw_reset_work);
 
 	if (sc->sc_flags & SC_OP_INVALID) {
 		ath_dbg(common, ATH_DBG_ANY, "Device not present\n");
--- a/drivers/net/wireless/ath/ath9k/xmit.c
+++ b/drivers/net/wireless/ath/ath9k/xmit.c
@@ -603,8 +603,10 @@ static void ath_tx_complete_aggr(struct 
 
 	rcu_read_unlock();
 
-	if (needreset)
-		ath_reset(sc, false);
+	if (needreset) {
+		sc->sc_flags |= SC_OP_HW_RESET;
+		ieee80211_queue_work(sc->hw, &sc->hw_reset_work);
+	}
 }
 
 static bool ath_lookup_legacy(struct ath_buf *bf)
@@ -1357,7 +1359,7 @@ void ath_txq_schedule(struct ath_softc *
 	struct ath_atx_ac *ac, *ac_tmp, *last_ac;
 	struct ath_atx_tid *tid, *last_tid;
 
-	if (list_empty(&txq->axq_acq) ||
+	if ((sc->sc_flags & SC_OP_HW_RESET) || list_empty(&txq->axq_acq) ||
 	    txq->axq_ampdu_depth >= ATH_AGGR_MIN_QDEPTH)
 		return;
 
@@ -2184,6 +2186,9 @@ static void ath_tx_processq(struct ath_s
 
 	spin_lock_bh(&txq->axq_lock);
 	for (;;) {
+		if (sc->sc_flags & SC_OP_HW_RESET)
+			break;
+
 		if (list_empty(&txq->axq_q)) {
 			txq->axq_link = NULL;
 			if (sc->sc_flags & SC_OP_TXAGGR)
@@ -2271,9 +2276,7 @@ static void ath_tx_complete_poll_work(st
 	if (needreset) {
 		ath_dbg(ath9k_hw_common(sc->sc_ah), ATH_DBG_RESET,
 			"tx hung, resetting the chip\n");
-		spin_lock_bh(&sc->sc_pcu_lock);
-		ath_reset(sc, true);
-		spin_unlock_bh(&sc->sc_pcu_lock);
+		ieee80211_queue_work(sc->hw, &sc->hw_reset_work);
 	}
 
 	ieee80211_queue_delayed_work(sc->hw, &sc->tx_complete_work,
@@ -2306,6 +2309,9 @@ void ath_tx_edma_tasklet(struct ath_soft
 	int status;
 
 	for (;;) {
+		if (sc->sc_flags & SC_OP_HW_RESET)
+			break;
+
 		status = ath9k_hw_txprocdesc(ah, NULL, (void *)&ts);
 		if (status == -EINPROGRESS)
 			break;