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sky2: Fix oops in sky2_xmit_frame() after TX timeout 

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@ring3k.org>

Reported-by: Berck E. Nash <flyboy@gmail.com>
Tested-by: Berck E. Nash <flyboy@gmail.com>
Signed-off-by: Jarek Poplawski <jarkao2@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jarek Poplawski 2010-01-04 08:48:41 +00:00 committed by David S. Miller
parent aa4e2e1713
commit 9db2f1bec3
1 changed files with 2 additions and 1 deletions
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3
drivers/net/sky2.c
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@ -1844,7 +1844,8 @@ static void sky2_tx_complete(struct sky2_port *sky2, u16 done)
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);
}