[PATCH] USB: fix race in kaweth disconnect

this patch from Herbert Xu fixes a race by moving termination of
the URBs into close() exclusively.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Oliver Neukum <oliver@neukum.name>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/usb/net/kaweth.c

@@ -219,7 +219,6 @@ struct kaweth_device
 
 	__u32 status;
 	int end;
-	int removed;
 	int suspend_lowmem_rx;
 	int suspend_lowmem_ctrl;
 	int linkstate;
@@ -699,6 +698,7 @@ static int kaweth_close(struct net_device *net)
 
 	usb_kill_urb(kaweth->irq_urb);
 	usb_kill_urb(kaweth->rx_urb);
+	usb_kill_urb(kaweth->tx_urb);
 
 	flush_scheduled_work();
 
@@ -750,13 +750,6 @@ static int kaweth_start_xmit(struct sk_buff *skb, struct net_device *net)
 
 	spin_lock(&kaweth->device_lock);
 
-	if (kaweth->removed) {
-	/* our device is undergoing disconnection - we bail out */
-		spin_unlock(&kaweth->device_lock);
-		dev_kfree_skb_irq(skb);
-		return 0;
-	}
-
 	kaweth_async_set_rx_mode(kaweth);
 	netif_stop_queue(net);
 
@@ -1136,10 +1129,6 @@ static void kaweth_disconnect(struct usb_interface *intf)
 		return;
 	}
 	netdev = kaweth->net;
-	kaweth->removed = 1;
-	usb_kill_urb(kaweth->irq_urb);
-	usb_kill_urb(kaweth->rx_urb);
-	usb_kill_urb(kaweth->tx_urb);
 
 	kaweth_dbg("Unregistering net device");
 	unregister_netdev(netdev);