linux-kernel - [ 052/108] atl1c: fix issue of transmit queue 0 timed out

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Message-Id: <20120723010659.344471507@decadent.org.uk>
Date:	Mon, 23 Jul 2012 02:07:43 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Cloud Ren <cjren@....qualcomm.com>,
	xiong <xiong@....qualcomm.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [ 052/108] atl1c: fix issue of transmit queue 0 timed out

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

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

From: Cloud Ren <cjren@....qualcomm.com>

commit b94e52f62683dc0b00c6d1b58b80929a078c0fd5 upstream.

some people report atl1c could cause system hang with following
kernel trace info:
---------------------------------------
WARNING: at.../net/sched/sch_generic.c:258 dev_watchdog+0x1db/0x1d0()
...
NETDEV WATCHDOG: eth0 (atl1c): transmit queue 0 timed out
...
---------------------------------------
This is caused by netif_stop_queue calling when cable Link is down.
So remove netif_stop_queue, because link_watch will take it over.

Signed-off-by: xiong <xiong@....qualcomm.com>
Signed-off-by: Cloud Ren <cjren@....qualcomm.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/net/ethernet/atheros/atl1c/atl1c_main.c |    1 -
 1 file changed, 1 deletion(-)

--- a/drivers/net/ethernet/atheros/atl1c/atl1c_main.c
+++ b/drivers/net/ethernet/atheros/atl1c/atl1c_main.c
@@ -267,7 +267,6 @@ static void atl1c_check_link_status(stru
 				dev_warn(&pdev->dev, "stop mac failed\n");
 		atl1c_set_aspm(hw, false);
 		netif_carrier_off(netdev);
-		netif_stop_queue(netdev);
 		atl1c_phy_reset(hw);
 		atl1c_phy_init(&adapter->hw);
 	} else {


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