ath9k: fix an issue with stopping rx/tx dma on AR93xx

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 45874

1 files changed, 33 insertions, 0 deletions

diff --git a/package/kernel/mac80211/patches/379-ath9k-fix-DMA-stop-sequence-for-AR9003.patch b/package/kernel/mac80211/patches/379-ath9k-fix-DMA-stop-sequence-for-AR9003.patch
new file mode 100644
index 0000000000..814b0d7a4a
--- /dev/null
+++ b/package/kernel/mac80211/patches/379-ath9k-fix-DMA-stop-sequence-for-AR9003.patch
@@ -0,0 +1,33 @@
+From: Felix Fietkau <nbd@openwrt.org>
+Date: Tue, 2 Jun 2015 10:35:46 +0200
+Subject: [PATCH] ath9k: fix DMA stop sequence for AR9003+
+
+AR93xx and newer needs to stop rx before tx to avoid getting the DMA
+engine or MAC into a stuck state.
+This should reduce/fix the occurence of "Failed to stop Tx DMA" logspam.
+
+Cc: stable@vger.kernel.org
+Signed-off-by: Felix Fietkau <nbd@openwrt.org>
+---
+
+--- a/drivers/net/wireless/ath/ath9k/main.c
++++ b/drivers/net/wireless/ath/ath9k/main.c
+@@ -216,11 +216,13 @@ static bool ath_prepare_reset(struct ath
+ 	ath_stop_ani(sc);
+ 	ath9k_hw_disable_interrupts(ah);
+ 
+-	if (!ath_drain_all_txq(sc))
+-		ret = false;
+-
+-	if (!ath_stoprecv(sc))
+-		ret = false;
++	if (AR_SREV_9300_20_OR_LATER(ah)) {
++		ret &= ath_stoprecv(sc);
++		ret &= ath_drain_all_txq(sc);
++	} else {
++		ret &= ath_drain_all_txq(sc);
++		ret &= ath_stoprecv(sc);
++	}
+ 
+ 	return ret;
+ }