From a9232076374334ca2bc2a448dfde96d38a54349a Mon Sep 17 00:00:00 2001
From: Jeff Westfahl <jeff.westfahl@ni.com>
Date: Thu, 29 May 2014 09:49:41 +0300
Subject: [PATCH] usb: gadget: u_ether: synchronize with transmit when stopping
 queue

When disconnecting, it's possible that another thread has already made it
into eth_start_xmit before we call netif_stop_queue. This can lead to a
crash as eth_start_xmit tries to use resources that gether_disconnect is
freeing. Use netif_tx_lock/unlock around netif_stop_queue to ensure no
threads are executing during the remainder of gether_disconnect.

Signed-off-by: Jeff Westfahl <jeff.westfahl@ni.com>
Tested-by: Jaeden Amero <jaeden.amero@ni.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
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