linux-kernel - [PATCH 3.12 037/123] ath9k: fix DMA stop sequence for AR9003+

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Date:	Tue,  4 Aug 2015 16:39:41 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Felix Fietkau <nbd@...nwrt.org>,
	Kalle Valo <kvalo@...eaurora.org>, Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 037/123] ath9k: fix DMA stop sequence for AR9003+

From: Felix Fietkau <nbd@...nwrt.org>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 300f77c08ded96d33f492aaa02549103852f0c12 upstream.

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.

Signed-off-by: Felix Fietkau <nbd@...nwrt.org>
Signed-off-by: Kalle Valo <kvalo@...eaurora.org>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/net/wireless/ath/ath9k/main.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c
index 5ba0da9d1959..5de6e032acc2 100644
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -194,11 +194,13 @@ static bool ath_prepare_reset(struct ath_softc *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;
 }
-- 
2.5.0

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