From: Jan Kara <jack@suse.cz>
Date: Tue, 17 Mar 2015 11:56:31 +0000 (-0300)
Subject: [media] vb2: Push mmap_sem down to memops
X-Git-Tag: omap-for-v4.2/fixes-rc1^2~111^2~450
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=48b25a3a713b90988b6882d318f7c0a6bed9aabc;p=pandora-kernel.git

[media] vb2: Push mmap_sem down to memops

Currently vb2 core acquires mmap_sem just around call to
__qbuf_userptr(). However since commit f035eb4e976ef5 (videobuf2: fix
lockdep warning) it isn't necessary to acquire it so early as we no
longer have to drop queue mutex before acquiring mmap_sem. So push
acquisition of mmap_sem down into .get_userptr and .put_userptr memops
so that the semaphore is acquired for a shorter time and it is clearer
what it is needed for.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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