diff --git a/[refs] b/[refs] index 4ef7e82a283d..a0547ddd9961 100644 --- a/[refs] +++ b/[refs] @@ -1,2 +1,2 @@ --- -refs/heads/master: 9dcfbd97a695a3c28a867501127fa35ac49bc805 +refs/heads/master: 5395353e0c8272fe73ac914acd7e4add0da2bef0 diff --git a/trunk/drivers/usb/gadget/ether.c b/trunk/drivers/usb/gadget/ether.c index ff244f42723f..9f4fd7e849a0 100644 --- a/trunk/drivers/usb/gadget/ether.c +++ b/trunk/drivers/usb/gadget/ether.c @@ -1957,8 +1957,20 @@ static int eth_start_xmit (struct sk_buff *skb, struct net_device *net) } spin_lock_irqsave(&dev->req_lock, flags); + /* + * this freelist can be empty if an interrupt triggered disconnect() + * and reconfigured the gadget (shutting down this queue) after the + * network stack decided to xmit but before we got the spinlock. + */ + if (list_empty(&dev->tx_reqs)) { + spin_unlock_irqrestore(&dev->req_lock, flags); + return 1; + } + req = container_of (dev->tx_reqs.next, struct usb_request, list); list_del (&req->list); + + /* temporarily stop TX queue when the freelist empties */ if (list_empty (&dev->tx_reqs)) netif_stop_queue (net); spin_unlock_irqrestore(&dev->req_lock, flags);