From: Hans Verkuil <hverkuil@xs4all.nl>
Date: Sat, 8 Jan 2011 12:38:02 +0000 (-0300)
Subject: [media] v4l2-fh: add v4l2_fh_is_singular
X-Git-Tag: v2.6.39-rc1~86^2~70
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=dfddb2441f39e8c0254504516be35b854addf6fa;p=pandora-kernel.git

[media] v4l2-fh: add v4l2_fh_is_singular

Several drivers need to do something when the first filehandle is opened
or the last filehandle is closed. Most implement some use count mechanism,
but if they use v4l2_fh, then you can also just check if this is the only
filehandle for the device node. A simple helper function can do this.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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