From: Hans Verkuil <hverkuil@xs4all.nl>
Date: Mon, 25 Aug 2014 11:57:59 +0000 (-0300)
Subject: [media] videobuf2-core: take mmap_sem before calling __qbuf_userptr
X-Git-Tag: fixes-against-v3.18-rc2~130^2^2~140
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=12561ad622de254d69ec1baaf6734afc602a2c30;p=pandora-kernel.git

[media] videobuf2-core: take mmap_sem before calling __qbuf_userptr

(Changes since v2: dropped local variable as suggested by Laurent)

Commit f035eb4e976ef5a059e30bc91cfd310ff030a7d3 (videobuf2: fix lockdep warning)
unfortunately removed the mmap_sem lock that is needed around the call to
__qbuf_userptr. Amazingly nobody noticed this (especially me as the author)
until Jan Kara pointed this out to me.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Reported-by: Jan Kara <jack@suse.cz>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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