ath9k_hw: Handle AR_INTR_SYNC_HOST1_(FATAL|PERR) on AR9003

Interrupts with the sync_cause AR_INTR_SYNC_HOST1_FATAL and
AR_INTR_SYNC_HOST1_PERR have to be handled using a chip reset. Otherwise a
interrupt storm with unhandled interrupts will cause a hang or crash of the
machine.

Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/ath/ath9k/ar9003_mac.c b/drivers/net/wireless/ath/ath9k/ar9003_mac.c
index d5b2e0e..301bf72 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/ar9003_mac.c
+++ b/drivers/net/wireless/ath/ath9k/ar9003_mac.c
@@ -182,6 +182,7 @@ static bool ar9003_hw_get_isr(struct ath_hw *ah, enum ath9k_int *masked)
        struct ath9k_hw_capabilities *pCap = &ah->caps;
        struct ath_common *common = ath9k_hw_common(ah);
        u32 sync_cause = 0, async_cause, async_mask = AR_INTR_MAC_IRQ;
+       bool fatal_int;
 
        if (ath9k_hw_mci_is_enabled(ah))
                async_mask |= AR_INTR_ASYNC_MASK_MCI;
@@ -310,6 +311,22 @@ static bool ar9003_hw_get_isr(struct ath_hw *ah, enum ath9k_int *masked)
 
        if (sync_cause) {
                ath9k_debug_sync_cause(common, sync_cause);
+               fatal_int =
+                       (sync_cause &
+                        (AR_INTR_SYNC_HOST1_FATAL | AR_INTR_SYNC_HOST1_PERR))
+                       ? true : false;
+
+               if (fatal_int) {
+                       if (sync_cause & AR_INTR_SYNC_HOST1_FATAL) {
+                               ath_dbg(common, ANY,
+                                       "received PCI FATAL interrupt\n");
+                       }
+                       if (sync_cause & AR_INTR_SYNC_HOST1_PERR) {
+                               ath_dbg(common, ANY,
+                                       "received PCI PERR interrupt\n");
+                       }
+                       *masked |= ATH9K_INT_FATAL;
+               }
 
                if (sync_cause & AR_INTR_SYNC_RADM_CPL_TIMEOUT) {
                        REG_WRITE(ah, AR_RC, AR_RC_HOSTIF);