From: Jeff Westfahl <jeff.westfahl@ni.com>
Date: Thu, 29 May 2014 06:49:41 +0000 (+0300)
Subject: usb: gadget: u_ether: synchronize with transmit when stopping queue
X-Git-Tag: omap-for-v3.16/fixes-rc4~20^2~9^2~7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a9232076374334ca2bc2a448dfde96d38a54349a;p=pandora-kernel.git

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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