From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Date: Sun, 25 Nov 2012 00:35:48 +0000 (-0300)
Subject: v4l: Reset subdev v4l2_dev field to NULL if registration fails
X-Git-Tag: v3.2.40~148
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=754aed1b98d1c1ed2a8eaae2fc933bc9c6a87629;p=pandora-kernel.git

v4l: Reset subdev v4l2_dev field to NULL if registration fails

commit 317efce991620adc589b3005b9baed433dcb2a56 upstream.

When subdev registration fails the subdev v4l2_dev field is left to a
non-NULL value. Later calls to v4l2_device_unregister_subdev() will
consider the subdev as registered and will module_put() the subdev
module without any matching module_get().
Fix this by setting the subdev v4l2_dev field to NULL in
v4l2_device_register_subdev() when the function fails.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
[bwh: Backported to 3.2: adjust context, filename]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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