ath9k: fix hang issues on hw reset caused by interrupt storms

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@33055 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/package/mac80211/patches/573-ath9k_fix_reset_hang.patch b/package/mac80211/patches/573-ath9k_fix_reset_hang.patch
new file mode 100644 (file)
index 0000000..7b4d62f
--- /dev/null
+++ b/package/mac80211/patches/573-ath9k_fix_reset_hang.patch
@@ -0,0 +1,61 @@
+--- a/drivers/net/wireless/ath/ath9k/mac.c
++++ b/drivers/net/wireless/ath/ath9k/mac.c
+@@ -783,15 +783,10 @@ bool ath9k_hw_intrpend(struct ath_hw *ah
+ }
+ EXPORT_SYMBOL(ath9k_hw_intrpend);
+ 
+-void ath9k_hw_disable_interrupts(struct ath_hw *ah)
++void ath9k_hw_kill_interrupts(struct ath_hw *ah)
+ {
+       struct ath_common *common = ath9k_hw_common(ah);
+ 
+-      if (!(ah->imask & ATH9K_INT_GLOBAL))
+-              atomic_set(&ah->intr_ref_cnt, -1);
+-      else
+-              atomic_dec(&ah->intr_ref_cnt);
+-
+       ath_dbg(common, INTERRUPT, "disable IER\n");
+       REG_WRITE(ah, AR_IER, AR_IER_DISABLE);
+       (void) REG_READ(ah, AR_IER);
+@@ -803,6 +798,17 @@ void ath9k_hw_disable_interrupts(struct 
+               (void) REG_READ(ah, AR_INTR_SYNC_ENABLE);
+       }
+ }
++EXPORT_SYMBOL(ath9k_hw_kill_interrupts);
++
++void ath9k_hw_disable_interrupts(struct ath_hw *ah)
++{
++      if (!(ah->imask & ATH9K_INT_GLOBAL))
++              atomic_set(&ah->intr_ref_cnt, -1);
++      else
++              atomic_dec(&ah->intr_ref_cnt);
++
++      ath9k_hw_kill_interrupts(ah);
++}
+ EXPORT_SYMBOL(ath9k_hw_disable_interrupts);
+ 
+ void ath9k_hw_enable_interrupts(struct ath_hw *ah)
+--- a/drivers/net/wireless/ath/ath9k/mac.h
++++ b/drivers/net/wireless/ath/ath9k/mac.h
+@@ -734,6 +734,7 @@ bool ath9k_hw_intrpend(struct ath_hw *ah
+ void ath9k_hw_set_interrupts(struct ath_hw *ah);
+ void ath9k_hw_enable_interrupts(struct ath_hw *ah);
+ void ath9k_hw_disable_interrupts(struct ath_hw *ah);
++void ath9k_hw_kill_interrupts(struct ath_hw *ah);
+ 
+ void ar9002_hw_attach_mac_ops(struct ath_hw *ah);
+ 
+--- a/drivers/net/wireless/ath/ath9k/main.c
++++ b/drivers/net/wireless/ath/ath9k/main.c
+@@ -459,8 +459,10 @@ irqreturn_t ath_isr(int irq, void *dev)
+       if (!ath9k_hw_intrpend(ah))
+               return IRQ_NONE;
+ 
+-      if(test_bit(SC_OP_HW_RESET, &sc->sc_flags))
++      if (test_bit(SC_OP_HW_RESET, &sc->sc_flags)) {
++              ath9k_hw_kill_interrupts(ah);
+               return IRQ_HANDLED;
++      }
+ 
+       /*
+        * Figure out the reason(s) for the interrupt.  Note