From: Oliver Neukum <oliver@neukum.org>
Date: Thu, 10 Jan 2013 10:04:55 +0000 (-0300)
Subject: [media] uvcvideo: Fix race of open and suspend in error case
X-Git-Tag: v3.9-rc1~93^2~179
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a82a45f65377b05fe8cd3167c7b0a70c508356b8;p=pandora-kernel.git

[media] uvcvideo: Fix race of open and suspend in error case

Ming Lei reported:
IMO, there is a minor fault in the error handling path of
uvc_status_start() inside uvc_v4l2_open(), and the 'users' count should
have been decreased before usb_autopm_put_interface(). In theory, a [URB
resubmission] warning can be triggered when the device is opened just
between usb_autopm_put_interface() and atomic_dec(&stream->dev->users).
The fix is trivial.

Reported-by: Ming Lei <tom.leiming@gmail.com>
Signed-off-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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