From: "kernel-team@fedoraproject.org" Date: Wed, 6 Feb 2013 09:57:47 -0500 Subject: [PATCH] ath9k: rx dma stop check --- drivers/net/wireless/ath/ath9k/mac.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/drivers/net/wireless/ath/ath9k/mac.c b/drivers/net/wireless/ath/ath9k/mac.c index bba85d1a6cd1..ebbee8f17130 100644 --- a/drivers/net/wireless/ath/ath9k/mac.c +++ b/drivers/net/wireless/ath/ath9k/mac.c @@ -693,7 +693,7 @@ bool ath9k_hw_stopdmarecv(struct ath_hw *ah, bool *reset) { #define AH_RX_STOP_DMA_TIMEOUT 10000 /* usec */ struct ath_common *common = ath9k_hw_common(ah); - u32 mac_status, last_mac_status = 0; + u32 mac_status = 0, last_mac_status = 0; int i; /* Enable access to the DMA observation bus */ @@ -723,6 +723,16 @@ bool ath9k_hw_stopdmarecv(struct ath_hw *ah, bool *reset) } if (i == 0) { + if (!AR_SREV_9300_20_OR_LATER(ah) && + (mac_status & 0x700) == 0) { + /* + * DMA is idle but the MAC is still stuck + * processing events + */ + *reset = true; + return true; + } + ath_err(common, "DMA failed to stop in %d ms AR_CR=0x%08x AR_DIAG_SW=0x%08x DMADBG_7=0x%08x\n", AH_RX_STOP_DMA_TIMEOUT / 1000,