linux-kernel - [45/74] sky2: Fix oops in sky2_xmit

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Date:	Thu, 04 Feb 2010 09:12:16 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Jarek Poplawski <jarkao2@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [45/74] sky2: Fix oops in sky2_xmit_frame() after TX timeout

2.6.32-stable review patch.  If anyone has any objections, please let us know.

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

From: Jarek Poplawski <jarkao2@...il.com>

[ Upstream commit 9db2f1bec36805e57a003f7bb90e003815d96de8 ]

During TX timeout procedure dev could be awoken too early, e.g. by
sky2_complete_tx() called from sky2_down(). Then sky2_xmit_frame()
can run while buffers are freed causing an oops. This patch fixes it
by adding netif_device_present() test in sky2_tx_complete().

Fixes: http://bugzilla.kernel.org/show_bug.cgi?id=14925

With debugging by: Mike McCormack <mikem@...g3k.org>

Reported-by: Berck E. Nash <flyboy@...il.com>
Tested-by: Berck E. Nash <flyboy@...il.com>
Signed-off-by: Jarek Poplawski <jarkao2@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/net/sky2.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/net/sky2.c
+++ b/drivers/net/sky2.c
@@ -1806,7 +1806,8 @@ static void sky2_tx_complete(struct sky2
 	sky2->tx_cons = idx;
 	smp_mb();

-	if (tx_avail(sky2) > MAX_SKB_TX_LE + 4)
+	/* Wake unless it's detached, and called e.g. from sky2_down() */
+	if (tx_avail(sky2) > MAX_SKB_TX_LE + 4 && netif_device_present(dev))
 		netif_wake_queue(dev);
 }

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