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can: usb_8dev: unregister netdev before free()ing

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The usb_8dev hardware has problems on some xhci USB hosts. The driver fails to
read the firmware revision in the probe function. This leads to the following
Oops:

    [ 3356.635912] kernel BUG at net/core/dev.c:5701!

The driver tries to free the netdev, which has already been registered, without
unregistering it.

This patch fixes the problem by unregistering the netdev in the error path.

Reported-by: Michael Olbrich <m.olbrich@pengutronix.de>
Reviewed-by: Bernd Krumboeck <krumboeck@universalnet.at>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Marc Kleine-Budde 2013-06-18 14:33:58 +02:00
parent 33be081a81
commit 4afe2156eb
1 changed files with 4 additions and 1 deletions
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5
drivers/net/can/usb/usb_8dev.c
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@ -977,7 +977,7 @@ static int usb_8dev_probe(struct usb_interface *intf,
err = usb_8dev_cmd_version(priv, &version);
if (err) {
netdev_err(netdev, "can't get firmware version\n");
goto cleanup_cmd_msg_buffer;
goto cleanup_unregister_candev;
} else {
netdev_info(netdev,
"firmware: %d.%d, hardware: %d.%d\n",
@ -989,6 +989,9 @@ static int usb_8dev_probe(struct usb_interface *intf,
return 0;
cleanup_unregister_candev:
unregister_netdev(priv->netdev);
cleanup_cmd_msg_buffer:
kfree(priv->cmd_msg_buffer);