sky2: Fix oops in sky2_xmit_frame() after TX timeout

[ 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@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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c
index 6a10d7ba58778245ca14ad4ba7b18c20aa7be79e..f3600b3eb8c5e68edc9be162ee7b28d66abeda36 100644 (file)
--- a/drivers/net/sky2.c
+++ b/drivers/net/sky2.c
@@ -1806,7 +1806,8 @@ 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);
 }