From: Zhuang Jin Can <jin.can.zhuang@intel.com>
Date: Wed, 3 Sep 2014 06:26:34 +0000 (+0800)
Subject: usb: dwc3: gadget: Fix desc NULL pointer in dwc3_gadget_ep_queue()
X-Git-Tag: fixes-for-v3.18-merge-window~137^2^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fdee4ebac96bb44c9c488fdd830b7cc831cd295d;p=pandora-kernel.git

usb: dwc3: gadget: Fix desc NULL pointer in dwc3_gadget_ep_queue()

dep->endpoint.desc is checked at the beginning of
dwc3_gadget_ep_queue(), but after that it may be set to NULL
by another thread and then accessed again in dwc3_gadget_ep_queue().
This will lead to kernel oops.

Expand spinlock protection area to aviod race condition.

Signed-off-by: Zhuang Jin Can <jin.can.zhuang@intel.com>
Signed-off-by: Jiebing Li <jiebing.li@intel.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
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