[ 3.5.y.z extended stable ] Patch "ath9k: limit tx path hang check to normal data queues" has been added to staging queue

[Luis Henriques]

This is a note to let you know that I have just added a patch titled

    ath9k: limit tx path hang check to normal data queues

to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.5.y-queue

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.5.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Luis

------

>From 26ee9617150f21cecfcc3e337684d2d67476e79f Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd at openwrt.org>
Date: Fri, 15 Mar 2013 16:18:44 +0100
Subject: [PATCH] ath9k: limit tx path hang check to normal data queues

commit 01d4ab96d2e7fceaad204e5a8710ce34e229b8c5 upstream.

The beacon and multicast-buffer queues are managed by the beacon
tasklet, and the generic tx path hang check does not help in any way
here. Running it on those queues anyway can introduce some race
conditions leading to unnecessary chip resets.

Signed-off-by: Felix Fietkau <nbd at openwrt.org>
Signed-off-by: John W. Linville <linville at tuxdriver.com>
[ luis: backported to 3.5:
  - file rename link.c -> xmit.c
  - adjust context ]
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 drivers/net/wireless/ath/ath9k/xmit.c | 26 +++++++++++++-------------
 1 file changed, 13 insertions(+), 13 deletions(-)

diff --git a/drivers/net/wireless/ath/ath9k/xmit.c b/drivers/net/wireless/ath/ath9k/xmit.c
index 12a42f2..894ed0e 100644
--- a/drivers/net/wireless/ath/ath9k/xmit.c
+++ b/drivers/net/wireless/ath/ath9k/xmit.c
@@ -2258,21 +2258,21 @@ static void ath_tx_complete_poll_work(struct work_struct *work)
 	sc->tx_complete_poll_work_seen++;
 #endif

-	for (i = 0; i < ATH9K_NUM_TX_QUEUES; i++)
-		if (ATH_TXQ_SETUP(sc, i)) {
-			txq = &sc->tx.txq[i];
-			ath_txq_lock(sc, txq);
-			if (txq->axq_depth) {
-				if (txq->axq_tx_inprogress) {
-					needreset = true;
-					ath_txq_unlock(sc, txq);
-					break;
-				} else {
-					txq->axq_tx_inprogress = true;
-				}
+	for (i = 0; i < IEEE80211_NUM_ACS; i++) {
+		txq = sc->tx.txq_map[i];
+
+		ath_txq_lock(sc, txq);
+		if (txq->axq_depth) {
+			if (txq->axq_tx_inprogress) {
+				needreset = true;
+				ath_txq_unlock(sc, txq);
+				break;
+			} else {
+				txq->axq_tx_inprogress = true;
 			}
-			ath_txq_unlock_complete(sc, txq);
 		}
+		ath_txq_unlock_complete(sc, txq);
+	}

 	if (needreset) {
 		ath_dbg(ath9k_hw_common(sc->sc_ah), RESET,
--
1.8.1.2