--- a/drivers/usb/net/usbnet.c	2004-12-25 00:34:58.000000000 +0300
+++ b/drivers/usb/net/usbnet.c	2005-05-26 21:02:58.000000000 +0400
@@ -2820,6 +2820,8 @@
 
 	urb->dev = NULL;
 	entry->state = tx_done;
+	spin_lock_rt (&dev->txq.lock);
+	spin_unlock_rt(&dev->txq.lock);
 	defer_bh (dev, skb);
 }