ath9k: add more pending locking fixes - fixes tx dma hang issues on reset

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@23649 3c298f89-4303-0410-b956-a3cf2f4a3e73

2 files changed, 200 insertions, 74 deletions

diff --git a/package/mac80211/patches/530-ath9k_locking_fix.patch b/package/mac80211/patches/530-ath9k_locking_fix.patch
index fef36eccc..29303323a 100644
--- a/package/mac80211/patches/530-ath9k_locking_fix.patch
+++ b/package/mac80211/patches/530-ath9k_locking_fix.patch
@@ -1,166 +1,267 @@
 --- a/drivers/net/wireless/ath/ath9k/ath9k.h
 +++ b/drivers/net/wireless/ath/ath9k/ath9k.h
-@@ -309,8 +309,8 @@ struct ath_rx {
+@@ -309,7 +309,6 @@ 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;
+@@ -600,9 +599,9 @@ struct ath_softc {
+ 	struct ath_hw *sc_ah;
+ 	void __iomem *mem;
+ 	int irq;
+-	spinlock_t sc_resetlock;
+ 	spinlock_t sc_serial_rw;
+ 	spinlock_t sc_pm_lock;
++	spinlock_t sc_pcu_lock;
+ 	struct mutex mutex;
+ 	struct work_struct paprd_work;
+ 	struct work_struct hw_check_work;
 --- 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
+@@ -228,6 +228,8 @@ int ath_set_channel(struct ath_softc *sc
+ 
+ 	ath9k_ps_wakeup(sc);
+ 
++	spin_lock_bh(&sc->sc_pcu_lock);
++
+ 	/*
+ 	 * This is only performed if the channel settings have
+ 	 * actually changed.
+@@ -239,6 +241,7 @@ 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
+@@ -257,18 +260,14 @@ int ath_set_channel(struct ath_softc *sc
+ 		  channel->center_freq, conf_is_ht40(conf),
+ 		  fastcc);
+ 
+-	spin_lock_bh(&sc->sc_resetlock);
+-
+ 	r = ath9k_hw_reset(ah, hchan, caldata, fastcc);
+ 	if (r) {
+ 		ath_print(common, ATH_DBG_FATAL,
+ 			  "Unable to reset channel (%u MHz), "
  			  "reset status %d\n",
  			  channel->center_freq, r);
- 		spin_unlock_bh(&sc->sc_resetlock);
-+		spin_unlock_bh(&sc->rx.pcu_lock);
+-		spin_unlock_bh(&sc->sc_resetlock);
  		goto ps_restore;
  	}
- 	spin_unlock_bh(&sc->sc_resetlock);
-@@ -274,9 +278,12 @@ int ath_set_channel(struct ath_softc *sc
+-	spin_unlock_bh(&sc->sc_resetlock);
+ 
+ 	if (ath_startrecv(sc) != 0) {
  		ath_print(common, ATH_DBG_FATAL,
- 			  "Unable to restart recv logic\n");
- 		r = -EIO;
-+		spin_unlock_bh(&sc->rx.pcu_lock);
- 		goto ps_restore;
+@@ -287,6 +286,8 @@ int ath_set_channel(struct ath_softc *sc
  	}
  
-+	spin_unlock_bh(&sc->rx.pcu_lock);
+  ps_restore:
++	spin_unlock_bh(&sc->sc_pcu_lock);
 +
- 	ath_update_txpow(sc);
- 	ath9k_hw_set_interrupts(ah, ah->imask);
+ 	ath9k_ps_restore(sc);
+ 	return r;
+ }
+@@ -600,6 +601,8 @@ void ath9k_tasklet(unsigned long data)
+ 		return;
+ 	}
+ 
++	spin_lock_bh(&sc->sc_pcu_lock);
++
+ 	if (!ath9k_hw_check_alive(ah))
+ 		ieee80211_queue_work(sc->hw, &sc->hw_check_work);
  
-@@ -610,7 +617,7 @@ void ath9k_tasklet(unsigned long data)
+@@ -610,15 +613,12 @@ 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)
+ 		    (status & ATH9K_INT_RXHP))
  			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 *
+@@ -644,6 +644,8 @@ void ath9k_tasklet(unsigned long data)
+ 
+ 	/* re-enable hardware interrupt */
+ 	ath9k_hw_enable_interrupts(ah);
++
++	spin_unlock_bh(&sc->sc_pcu_lock);
+ 	ath9k_ps_restore(sc);
+ }
+ 
+@@ -871,12 +873,13 @@ void ath_radio_enable(struct ath_softc *
+ 	int r;
+ 
+ 	ath9k_ps_wakeup(sc);
++	spin_lock_bh(&sc->sc_pcu_lock);
++
+ 	ath9k_hw_configpcipowersave(ah, 0, 0);
+ 
  	if (!ah->curchan)
  		ah->curchan = ath_get_curchannel(sc, sc->hw);
  
-+	spin_lock_bh(&sc->rx.pcu_lock);
- 	spin_lock_bh(&sc->sc_resetlock);
+-	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 *
+ 		ath_print(common, ATH_DBG_FATAL,
+@@ -884,15 +887,14 @@ void ath_radio_enable(struct ath_softc *
+ 			  "reset status %d\n",
+ 			  channel->center_freq, r);
+ 	}
+-	spin_unlock_bh(&sc->sc_resetlock);
+ 
+ 	ath_update_txpow(sc);
  	if (ath_startrecv(sc) != 0) {
  		ath_print(common, ATH_DBG_FATAL,
  			  "Unable to restart recv logic\n");
-+		spin_unlock_bh(&sc->rx.pcu_lock);
++		spin_unlock_bh(&sc->sc_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 
+ 
+@@ -905,6 +907,8 @@ void ath_radio_enable(struct ath_softc *
+ 	ath9k_hw_set_gpio(ah, ah->led_pin, 0);
+ 
+ 	ieee80211_wake_queues(hw);
++	spin_unlock_bh(&sc->sc_pcu_lock);
++
+ 	ath9k_ps_restore(sc);
+ }
+ 
+@@ -915,6 +919,8 @@ void ath_radio_disable(struct ath_softc 
+ 	int r;
+ 
+ 	ath9k_ps_wakeup(sc);
++	spin_lock_bh(&sc->sc_pcu_lock);
++
+ 	ieee80211_stop_queues(hw);
+ 
+ 	/*
+@@ -930,13 +936,13 @@ 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);
+ 	if (!ah->curchan)
+ 		ah->curchan = ath_get_curchannel(sc, hw);
+ 
+-	spin_lock_bh(&sc->sc_resetlock);
+ 	r = ath9k_hw_reset(ah, ah->curchan, ah->caldata, false);
+ 	if (r) {
+ 		ath_print(ath9k_hw_common(sc->sc_ah), ATH_DBG_FATAL,
+@@ -944,11 +950,14 @@ void ath_radio_disable(struct ath_softc 
+ 			  "reset status %d\n",
+ 			  channel->center_freq, r);
+ 	}
+-	spin_unlock_bh(&sc->sc_resetlock);
  
  	ath9k_hw_phy_disable(ah);
 +
-+	spin_unlock_bh(&sc->rx.pcu_lock);
-+
  	ath9k_hw_configpcipowersave(ah, 1, 1);
++
++	spin_unlock_bh(&sc->sc_pcu_lock);
  	ath9k_ps_restore(sc);
++
  	ath9k_setpower(sc, ATH9K_PM_FULL_SLEEP);
-@@ -966,6 +982,9 @@ int ath_reset(struct ath_softc *sc, bool
+ }
+ 
+@@ -962,19 +971,20 @@ int ath_reset(struct ath_softc *sc, bool
+ 	/* Stop ANI */
+ 	del_timer_sync(&common->ani.timer);
+ 
++	spin_lock_bh(&sc->sc_pcu_lock);
++
+ 	ieee80211_stop_queues(hw);
  
  	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
+-	spin_lock_bh(&sc->sc_resetlock);
+ 	r = ath9k_hw_reset(ah, sc->sc_ah->curchan, ah->caldata, false);
+ 	if (r)
  		ath_print(common, ATH_DBG_FATAL,
- 			  "Unable to start recv logic\n");
+ 			  "Unable to reset hardware; reset status %d\n", r);
+-	spin_unlock_bh(&sc->sc_resetlock);
  
-+	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_
+ 	if (ath_startrecv(sc) != 0)
+ 		ath_print(common, ATH_DBG_FATAL,
+@@ -1004,6 +1014,7 @@ int ath_reset(struct ath_softc *sc, bool
+ 	}
+ 
+ 	ieee80211_wake_queues(hw);
++	spin_unlock_bh(&sc->sc_pcu_lock);
+ 
+ 	/* Start ANI */
+ 	ath_start_ani(common);
+@@ -1142,17 +1153,16 @@ 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);
+-	spin_lock_bh(&sc->sc_resetlock);
++	spin_lock_bh(&sc->sc_pcu_lock);
  	r = ath9k_hw_reset(ah, init_channel, ah->caldata, false);
  	if (r) {
-@@ -1150,6 +1172,7 @@ static int ath9k_start(struct ieee80211_
+ 		ath_print(common, ATH_DBG_FATAL,
+ 			  "Unable to reset hardware; reset status %d "
  			  "(freq %u MHz)\n", r,
  			  curchan->center_freq);
- 		spin_unlock_bh(&sc->sc_resetlock);
-+		spin_unlock_bh(&sc->rx.pcu_lock);
+-		spin_unlock_bh(&sc->sc_resetlock);
++		spin_unlock_bh(&sc->sc_pcu_lock);
  		goto mutex_unlock;
  	}
- 	spin_unlock_bh(&sc->sc_resetlock);
-@@ -1171,8 +1194,10 @@ static int ath9k_start(struct ieee80211_
+-	spin_unlock_bh(&sc->sc_resetlock);
+ 
+ 	/*
+ 	 * This is needed only to setup initial state
+@@ -1171,8 +1181,10 @@ 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);
++		spin_unlock_bh(&sc->sc_pcu_lock);
  		goto mutex_unlock;
  	}
-+	spin_unlock_bh(&sc->rx.pcu_lock);
++	spin_unlock_bh(&sc->sc_pcu_lock);
  
  	/* Setup our intr mask. */
  	ah->imask = ATH9K_INT_TX | ATH9K_INT_RXEOL |
-@@ -1371,12 +1396,14 @@ static void ath9k_stop(struct ieee80211_
+@@ -1367,6 +1379,8 @@ static void ath9k_stop(struct ieee80211_
+ 			ath9k_btcoex_timer_pause(sc);
+ 	}
+ 
++	spin_lock_bh(&sc->sc_pcu_lock);
++
+ 	/* make sure h/w will not generate any interrupt
  	 * 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);
- 
+@@ -1381,6 +1395,9 @@ static void ath9k_stop(struct ieee80211_
  	/* disable HAL and put h/w to sleep */
  	ath9k_hw_disable(ah);
+ 	ath9k_hw_configpcipowersave(ah, 1, 1);
++
++	spin_unlock_bh(&sc->sc_pcu_lock);
++
+ 	ath9k_ps_restore(sc);
+ 
+ 	/* Finally, put the chip in FULL SLEEP mode */
 --- 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
@@ -185,16 +286,15 @@
  }
  
  int ath_rx_init(struct ath_softc *sc, int nbufs)
-@@ -319,8 +317,8 @@ int ath_rx_init(struct ath_softc *sc, in
+@@ -319,7 +317,7 @@ int ath_rx_init(struct ath_softc *sc, in
  	struct ath_buf *bf;
  	int error = 0;
  
 -	spin_lock_init(&sc->rx.rxflushlock);
++	spin_lock_init(&sc->sc_pcu_lock);
  	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);
  
@@ -235,3 +335,29 @@
  }
  
  static bool ath_beacon_dtim_pending_cab(struct sk_buff *skb)
+--- a/drivers/net/wireless/ath/ath9k/init.c
++++ b/drivers/net/wireless/ath/ath9k/init.c
+@@ -588,7 +588,6 @@ static int ath9k_init_softc(u16 devid, s
+ 	spin_lock_init(&common->cc_lock);
+ 
+ 	spin_lock_init(&sc->wiphy_lock);
+-	spin_lock_init(&sc->sc_resetlock);
+ 	spin_lock_init(&sc->sc_serial_rw);
+ 	spin_lock_init(&sc->sc_pm_lock);
+ 	mutex_init(&sc->mutex);
+--- a/drivers/net/wireless/ath/ath9k/xmit.c
++++ b/drivers/net/wireless/ath/ath9k/xmit.c
+@@ -1142,13 +1142,11 @@ void ath_drain_all_txq(struct ath_softc 
+ 		ath_print(common, ATH_DBG_FATAL,
+ 			  "Failed to stop TX DMA. Resetting hardware!\n");
+ 
+-		spin_lock_bh(&sc->sc_resetlock);
+ 		r = ath9k_hw_reset(ah, sc->sc_ah->curchan, ah->caldata, false);
+ 		if (r)
+ 			ath_print(common, ATH_DBG_FATAL,
+ 				  "Unable to reset hardware; reset status %d\n",
+ 				  r);
+-		spin_unlock_bh(&sc->sc_resetlock);
+ 	}
+ 
+ 	for (i = 0; i < ATH9K_NUM_TX_QUEUES; i++) {
diff --git a/package/mac80211/patches/570-ath9k_reset_aggr_fix.patch b/package/mac80211/patches/570-ath9k_reset_aggr_fix.patch
index d4b52ed33..81866d6e8 100644
--- a/package/mac80211/patches/570-ath9k_reset_aggr_fix.patch
+++ b/package/mac80211/patches/570-ath9k_reset_aggr_fix.patch
@@ -1,6 +1,6 @@
 --- a/drivers/net/wireless/ath/ath9k/main.c
 +++ b/drivers/net/wireless/ath/ath9k/main.c
-@@ -587,7 +587,7 @@ void ath_hw_check(struct work_struct *wo
+@@ -581,7 +581,7 @@ void ath_hw_check(struct work_struct *wo
  
  		msleep(1);
  	}
@@ -9,7 +9,7 @@
  
  out:
  	ath9k_ps_restore(sc);
-@@ -605,7 +605,7 @@ void ath9k_tasklet(unsigned long data)
+@@ -599,7 +599,7 @@ void ath9k_tasklet(unsigned long data)
  	ath9k_ps_wakeup(sc);
  
  	if (status & ATH9K_INT_FATAL) {
@@ -20,7 +20,7 @@
  	}
 --- a/drivers/net/wireless/ath/ath9k/xmit.c
 +++ b/drivers/net/wireless/ath/ath9k/xmit.c
-@@ -2163,7 +2163,7 @@ static void ath_tx_complete_poll_work(st
+@@ -2161,7 +2161,7 @@ static void ath_tx_complete_poll_work(st
  		ath_print(ath9k_hw_common(sc->sc_ah), ATH_DBG_RESET,
  			  "tx hung, resetting the chip\n");
  		ath9k_ps_wakeup(sc);