3 files changed, 35 insertions, 4 deletions

diff --git a/drivers/net/wireless/ath/ath9k/ath9k.h b/drivers/net/wireless/ath/ath9k/ath9k.h
index cba7d772f7f3..b5ac32cfbeb8 100644
--- a/drivers/net/wireless/ath/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
@@ -691,6 +691,7 @@ void ath_ant_comb_scan(struct ath_softc *sc, struct ath_rx_status *rs);
 #define DEFAULT_CACHELINE       32
 #define ATH_CABQ_READY_TIME     80      /* % of beacon interval */
 #define ATH_TXPOWER_MAX         100     /* .5 dBm units */
+#define MAX_GTT_CNT             5
 
 enum sc_op_flags {
 	SC_OP_INVALID,
@@ -733,6 +734,7 @@ struct ath_softc {
 	unsigned long sc_flags;
 	unsigned long driver_data;
 
+	u8 gtt_cnt;
 	u32 intrstatus;
 	u16 ps_flags; /* PS_* */
 	u16 curtxpow;
diff --git a/drivers/net/wireless/ath/ath9k/debug.h b/drivers/net/wireless/ath/ath9k/debug.h
index b01b8c3ec570..cc7a025d833e 100644
--- a/drivers/net/wireless/ath/ath9k/debug.h
+++ b/drivers/net/wireless/ath/ath9k/debug.h
@@ -44,6 +44,7 @@ enum ath_reset_type {
 	RESET_TYPE_BB_WATCHDOG,
 	RESET_TYPE_FATAL_INT,
 	RESET_TYPE_TX_ERROR,
+	RESET_TYPE_TX_GTT,
 	RESET_TYPE_TX_HANG,
 	RESET_TYPE_PLL_HANG,
 	RESET_TYPE_MAC_HANG,
diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c
index ca8aff1aec94..73a36551a5ed 100644
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -258,6 +258,7 @@ static bool ath_complete_reset(struct ath_softc *sc, bool start)
 		}
 	}
 
+	sc->gtt_cnt = 0;
 	ieee80211_wake_queues(sc->hw);
 
 	return true;
@@ -476,6 +477,19 @@ void ath9k_tasklet(unsigned long data)
 		}
 	}
 
+	if (status & ATH9K_INT_GTT) {
+		sc->gtt_cnt++;
+
+		if ((sc->gtt_cnt >= MAX_GTT_CNT) && !ath9k_hw_check_alive(ah)) {
+			type = RESET_TYPE_TX_GTT;
+			ath9k_queue_reset(sc, type);
+			atomic_inc(&ah->intr_ref_cnt);
+			ath_dbg(common, ANY,
+				"GTT: Skipping interrupts\n");
+			goto out;
+		}
+	}
+
 	spin_lock_irqsave(&sc->sc_pm_lock, flags);
 	if ((status & ATH9K_INT_TSFOOR) && sc->ps_enabled) {
 		/*
@@ -503,10 +517,19 @@ void ath9k_tasklet(unsigned long data)
 	}
 
 	if (status & ATH9K_INT_TX) {
-		if (ah->caps.hw_caps & ATH9K_HW_CAP_EDMA)
+		if (ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) {
+			/*
+			 * For EDMA chips, TX completion is enabled for the
+			 * beacon queue, so if a beacon has been transmitted
+			 * successfully after a GTT interrupt, the GTT counter
+			 * gets reset to zero here.
+			 */
+			/* sc->gtt_cnt = 0; */
+
 			ath_tx_edma_tasklet(sc);
-		else
+		} else {
 			ath_tx_tasklet(sc);
+		}
 
 		wake_up(&sc->tx_wait);
 	}
@@ -536,6 +559,7 @@ irqreturn_t ath_isr(int irq, void *dev)
 		ATH9K_INT_TX |			\
 		ATH9K_INT_BMISS |		\
 		ATH9K_INT_CST |			\
+		ATH9K_INT_GTT |			\
 		ATH9K_INT_TSFOOR |		\
 		ATH9K_INT_GENTIMER |		\
 		ATH9K_INT_MCI)
@@ -608,7 +632,6 @@ irqreturn_t ath_isr(int irq, void *dev)
 	}
 #endif
 
-
 	if (status & ATH9K_INT_SWBA)
 		tasklet_schedule(&sc->bcon_tasklet);
 
@@ -733,7 +756,12 @@ static int ath9k_start(struct ieee80211_hw *hw)
 	if (ah->config.hw_hang_checks & HW_BB_WATCHDOG)
 		ah->imask |= ATH9K_INT_BB_WATCHDOG;
 
-	ah->imask |= ATH9K_INT_GTT;
+	/*
+	 * Enable GTT interrupts only for AR9003/AR9004 chips
+	 * for now.
+	 */
+	if (AR_SREV_9300_20_OR_LATER(ah))
+		ah->imask |= ATH9K_INT_GTT;
 
 	if (ah->caps.hw_caps & ATH9K_HW_CAP_HT)
 		ah->imask |= ATH9K_INT_CST;