linux-kernel - [PATCH 3.16.y-ckt 055/185] ath9k: fix DMA stop sequence for AR9003+

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Message-Id: <1436951580-15977-56-git-send-email-luis.henriques@canonical.com>
Date:	Wed, 15 Jul 2015 10:10:50 +0100
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Felix Fietkau <nbd@...nwrt.org>, Kalle Valo <kvalo@...eaurora.org>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 055/185] ath9k: fix DMA stop sequence for AR9003+

3.16.7-ckt15 -stable review patch.  If anyone has any objections, please let me know.

------------------

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

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: Luis Henriques <luis.henriques@...onical.com>
---
 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 62ac95d6bb9d..bf6efbc2c9c0 100644
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -205,11 +205,13 @@ static bool ath_prepare_reset(struct ath_softc *sc)
 	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;
 }
--
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