linux-kernel - [ 014/124] ath9k: avoid queueing hw check work when suspended

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Message-Id: <20130402221105.861465537@linuxfoundation.org>
Date:	Tue,  2 Apr 2013 15:09:56 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Parag Warudkar <parag.lkml@...il.com>,
	"Luis R. Rodriguez" <mcgrof@...not-panic.com>,
	"John W. Linville" <linville@...driver.com>
Subject: [ 014/124] ath9k: avoid queueing hw check work when suspended

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

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

From: "Luis R. Rodriguez" <mcgrof@...not-panic.com>

commit 7fc0357479eeff4ca808c4d8c09bc7631f576b8d upstream.

The following issue was reported.

WARNING: at net/mac80211/util.c:599 ieee80211_can_queue_work.isra.7+0x32/0x40 [mac80211]()
Hardware name: iMac12,1
queueing ieee80211 work while going to suspend
Pid: 0, comm: swapper/0 Tainted: PF          O 3.8.2-206.fc18.x86_64 #1
Call Trace: Mar 16 09:39:17 Parags-iMac kernel: [ 3993.642992]  <IRQ>
[<ffffffff8105e61f>] warn_slowpath_common+0x7f/0xc0
[<ffffffffa0581420>] ? ath_start_rx_poll+0x70/0x70 [ath9k]
<ffffffff8105e716>] warn_slowpath_fmt+0x46/0x50
[<ffffffffa045b542>] ieee80211_can_queue_work.isra.7+0x32/0x40

Fix this by avoiding to queue the work if our device has
already been marked as suspended or stopped.

Reported-by: Parag Warudkar <parag.lkml@...il.com>
Tested-by: Parag Warudkar <parag.lkml@...il.com>
Signed-off-by: Luis R. Rodriguez <mcgrof@...not-panic.com>
Signed-off-by: John W. Linville <linville@...driver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/net/wireless/ath/ath9k/link.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/net/wireless/ath/ath9k/link.c
+++ b/drivers/net/wireless/ath/ath9k/link.c
@@ -170,7 +170,8 @@ void ath_rx_poll(unsigned long data)
 {
 	struct ath_softc *sc = (struct ath_softc *)data;
 
-	ieee80211_queue_work(sc->hw, &sc->hw_check_work);
+	if (!test_bit(SC_OP_INVALID, &sc->sc_flags))
+		ieee80211_queue_work(sc->hw, &sc->hw_check_work);
 }
 
 /*


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