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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>
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@ -1844,7 +1844,8 @@ static void sky2_tx_complete(struct sky2_port *sky2, u16 done)
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sky2->tx_cons = idx;
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smp_mb();
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if (tx_avail(sky2) > MAX_SKB_TX_LE + 4)
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/* Wake unless it's detached, and called e.g. from sky2_down() */
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if (tx_avail(sky2) > MAX_SKB_TX_LE + 4 && netif_device_present(dev))
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netif_wake_queue(dev);
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}
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