openwrt/package/mac80211/patches/530-ath9k_locking_fix.patch

--- a/drivers/net/wireless/ath/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
@@ -309,8 +309,8 @@ struct ath_rx {
 	u8 rxotherant;
 	u32 *rxlink;
 	unsigned int rxfilter;
-	spinlock_t rxflushlock;
 	spinlock_t rxbuflock;
+	spinlock_t pcu_lock;
 	struct list_head rxbuf;
 	struct ath_descdma rxdma;
 	struct ath_buf *rx_bufptr;
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -239,6 +239,9 @@ int ath_set_channel(struct ath_softc *sc
 	 */
 	ath9k_hw_disable_interrupts(ah);
 	ath_drain_all_txq(sc, false);
+
+	spin_lock_bh(&sc->rx.pcu_lock);
+
 	stopped = ath_stoprecv(sc);
 
 	/* XXX: do not flush receive queue here. We don't want
@@ -266,6 +269,7 @@ int ath_set_channel(struct ath_softc *sc
 			  "reset status %d\n",
 			  channel->center_freq, r);
 		spin_unlock_bh(&sc->sc_resetlock);
+		spin_unlock_bh(&sc->rx.pcu_lock);
 		goto ps_restore;
 	}
 	spin_unlock_bh(&sc->sc_resetlock);
@@ -274,9 +278,12 @@ int ath_set_channel(struct ath_softc *sc
 		ath_print(common, ATH_DBG_FATAL,
 			  "Unable to restart recv logic\n");
 		r = -EIO;
+		spin_unlock_bh(&sc->rx.pcu_lock);
 		goto ps_restore;
 	}
 
+	spin_unlock_bh(&sc->rx.pcu_lock);
+
 	ath_update_txpow(sc);
 	ath9k_hw_set_interrupts(ah, ah->imask);
 
@@ -610,7 +617,7 @@ void ath9k_tasklet(unsigned long data)
 		rxmask = (ATH9K_INT_RX | ATH9K_INT_RXEOL | ATH9K_INT_RXORN);
 
 	if (status & rxmask) {
-		spin_lock_bh(&sc->rx.rxflushlock);
+		spin_lock_bh(&sc->rx.pcu_lock);
 
 		/* Check for high priority Rx first */
 		if ((ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) &&
@@ -618,7 +625,7 @@ void ath9k_tasklet(unsigned long data)
 			ath_rx_tasklet(sc, 0, true);
 
 		ath_rx_tasklet(sc, 0, false);
-		spin_unlock_bh(&sc->rx.rxflushlock);
+		spin_unlock_bh(&sc->rx.pcu_lock);
 	}
 
 	if (status & ATH9K_INT_TX) {
@@ -876,6 +883,7 @@ void ath_radio_enable(struct ath_softc *
 	if (!ah->curchan)
 		ah->curchan = ath_get_curchannel(sc, sc->hw);
 
+	spin_lock_bh(&sc->rx.pcu_lock);
 	spin_lock_bh(&sc->sc_resetlock);
 	r = ath9k_hw_reset(ah, ah->curchan, ah->caldata, false);
 	if (r) {
@@ -890,8 +898,10 @@ void ath_radio_enable(struct ath_softc *
 	if (ath_startrecv(sc) != 0) {
 		ath_print(common, ATH_DBG_FATAL,
 			  "Unable to restart recv logic\n");
+		spin_unlock_bh(&sc->rx.pcu_lock);
 		return;
 	}
+	spin_unlock_bh(&sc->rx.pcu_lock);
 
 	if (sc->sc_flags & SC_OP_BEACONS)
 		ath_beacon_config(sc, NULL);	/* restart beacons */
@@ -930,6 +940,9 @@ void ath_radio_disable(struct ath_softc 
 	ath9k_hw_disable_interrupts(ah);
 
 	ath_drain_all_txq(sc, false);	/* clear pending tx frames */
+
+	spin_lock_bh(&sc->rx.pcu_lock);
+
 	ath_stoprecv(sc);		/* turn off frame recv */
 	ath_flushrecv(sc);		/* flush recv queue */
 
@@ -947,6 +960,9 @@ void ath_radio_disable(struct ath_softc 
 	spin_unlock_bh(&sc->sc_resetlock);
 
 	ath9k_hw_phy_disable(ah);
+
+	spin_unlock_bh(&sc->rx.pcu_lock);
+
 	ath9k_hw_configpcipowersave(ah, 1, 1);
 	ath9k_ps_restore(sc);
 	ath9k_setpower(sc, ATH9K_PM_FULL_SLEEP);
@@ -966,6 +982,9 @@ int ath_reset(struct ath_softc *sc, bool
 
 	ath9k_hw_disable_interrupts(ah);
 	ath_drain_all_txq(sc, retry_tx);
+
+	spin_lock_bh(&sc->rx.pcu_lock);
+
 	ath_stoprecv(sc);
 	ath_flushrecv(sc);
 
@@ -980,6 +999,8 @@ int ath_reset(struct ath_softc *sc, bool
 		ath_print(common, ATH_DBG_FATAL,
 			  "Unable to start recv logic\n");
 
+	spin_unlock_bh(&sc->rx.pcu_lock);
+
 	/*
 	 * We may be doing a reset in response to a request
 	 * that changes the channel so update any state that
@@ -1142,6 +1163,7 @@ static int ath9k_start(struct ieee80211_
 	 * be followed by initialization of the appropriate bits
 	 * and then setup of the interrupt mask.
 	 */
+	spin_lock_bh(&sc->rx.pcu_lock);
 	spin_lock_bh(&sc->sc_resetlock);
 	r = ath9k_hw_reset(ah, init_channel, ah->caldata, false);
 	if (r) {
@@ -1150,6 +1172,7 @@ static int ath9k_start(struct ieee80211_
 			  "(freq %u MHz)\n", r,
 			  curchan->center_freq);
 		spin_unlock_bh(&sc->sc_resetlock);
+		spin_unlock_bh(&sc->rx.pcu_lock);
 		goto mutex_unlock;
 	}
 	spin_unlock_bh(&sc->sc_resetlock);
@@ -1171,8 +1194,10 @@ static int ath9k_start(struct ieee80211_
 		ath_print(common, ATH_DBG_FATAL,
 			  "Unable to start recv logic\n");
 		r = -EIO;
+		spin_unlock_bh(&sc->rx.pcu_lock);
 		goto mutex_unlock;
 	}
+	spin_unlock_bh(&sc->rx.pcu_lock);
 
 	/* Setup our intr mask. */
 	ah->imask = ATH9K_INT_TX | ATH9K_INT_RXEOL |
@@ -1371,12 +1396,14 @@ static void ath9k_stop(struct ieee80211_
 	 * before setting the invalid flag. */
 	ath9k_hw_disable_interrupts(ah);
 
+	spin_lock_bh(&sc->rx.pcu_lock);
 	if (!(sc->sc_flags & SC_OP_INVALID)) {
 		ath_drain_all_txq(sc, false);
 		ath_stoprecv(sc);
 		ath9k_hw_phy_disable(ah);
 	} else
 		sc->rx.rxlink = NULL;
+	spin_unlock_bh(&sc->rx.pcu_lock);
 
 	/* disable HAL and put h/w to sleep */
 	ath9k_hw_disable(ah);
--- a/drivers/net/wireless/ath/ath9k/recv.c
+++ b/drivers/net/wireless/ath/ath9k/recv.c
@@ -297,19 +297,17 @@ static void ath_edma_start_recv(struct a
 	ath_rx_addbuffer_edma(sc, ATH9K_RX_QUEUE_LP,
 			      sc->rx.rx_edma[ATH9K_RX_QUEUE_LP].rx_fifo_hwsize);
 
-	spin_unlock_bh(&sc->rx.rxbuflock);
-
 	ath_opmode_init(sc);
 
 	ath9k_hw_startpcureceive(sc->sc_ah, (sc->sc_flags & SC_OP_OFFCHANNEL));
+
+	spin_unlock_bh(&sc->rx.rxbuflock);
 }
 
 static void ath_edma_stop_recv(struct ath_softc *sc)
 {
-	spin_lock_bh(&sc->rx.rxbuflock);
 	ath_rx_remove_buffer(sc, ATH9K_RX_QUEUE_HP);
 	ath_rx_remove_buffer(sc, ATH9K_RX_QUEUE_LP);
-	spin_unlock_bh(&sc->rx.rxbuflock);
 }
 
 int ath_rx_init(struct ath_softc *sc, int nbufs)
@@ -319,8 +317,8 @@ int ath_rx_init(struct ath_softc *sc, in
 	struct ath_buf *bf;
 	int error = 0;
 
-	spin_lock_init(&sc->rx.rxflushlock);
 	sc->sc_flags &= ~SC_OP_RXFLUSH;
+	spin_lock_init(&sc->rx.pcu_lock);
 	spin_lock_init(&sc->rx.rxbuflock);
 
 	if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) {
@@ -506,9 +504,9 @@ int ath_startrecv(struct ath_softc *sc)
 	ath9k_hw_rxena(ah);
 
 start_recv:
-	spin_unlock_bh(&sc->rx.rxbuflock);
 	ath_opmode_init(sc);
 	ath9k_hw_startpcureceive(ah, (sc->sc_flags & SC_OP_OFFCHANNEL));
+	spin_unlock_bh(&sc->rx.rxbuflock);
 
 	return 0;
 }
@@ -518,6 +516,7 @@ bool ath_stoprecv(struct ath_softc *sc)
 	struct ath_hw *ah = sc->sc_ah;
 	bool stopped;
 
+	spin_lock_bh(&sc->rx.rxbuflock);
 	ath9k_hw_stoppcurecv(ah);
 	ath9k_hw_setrxfilter(ah, 0);
 	stopped = ath9k_hw_stopdmarecv(ah);
@@ -526,19 +525,18 @@ bool ath_stoprecv(struct ath_softc *sc)
 		ath_edma_stop_recv(sc);
 	else
 		sc->rx.rxlink = NULL;
+	spin_unlock_bh(&sc->rx.rxbuflock);
 
 	return stopped;
 }
 
 void ath_flushrecv(struct ath_softc *sc)
 {
-	spin_lock_bh(&sc->rx.rxflushlock);
 	sc->sc_flags |= SC_OP_RXFLUSH;
 	if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA)
 		ath_rx_tasklet(sc, 1, true);
 	ath_rx_tasklet(sc, 1, false);
 	sc->sc_flags &= ~SC_OP_RXFLUSH;
-	spin_unlock_bh(&sc->rx.rxflushlock);
 }
 
 static bool ath_beacon_dtim_pending_cab(struct sk_buff *skb)