ath9k: Do an AHB reset before doing RTC reset

Doing an RTC reset when DMA is active may corrupt memory,
make sure no DMA is active at this moment by doing an
AHB reset.

Signed-off-by: Vasanthakumar Thiagarajan <vasanth@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/ath/ath9k/hw.c b/drivers/net/wireless/ath/ath9k/hw.c
index e340dacc6ebe7141e8aa40d32f649d0b13a01dfc..71f27f324ceacab0a3e4df2a184aaff43ae21df6 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/hw.c
+++ b/drivers/net/wireless/ath/ath9k/hw.c
@@ -1712,8 +1712,15 @@ static bool ath9k_hw_set_reset_power_on(struct ath_hw *ah)
        REG_WRITE(ah, AR_RTC_FORCE_WAKE, AR_RTC_FORCE_WAKE_EN |
                  AR_RTC_FORCE_WAKE_ON_INT);
 
+       if (!AR_SREV_9100(ah))
+               REG_WRITE(ah, AR_RC, AR_RC_AHB);
+
        REG_WRITE(ah, AR_RTC_RESET, 0);
        udelay(2);
+
+       if (!AR_SREV_9100(ah))
+               REG_WRITE(ah, AR_RC, 0);
+
        REG_WRITE(ah, AR_RTC_RESET, 1);
 
        if (!ath9k_hw_wait(ah,