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media: v4l2-mem2mem.c: fix broken links 

commit 316e730f1d upstream.

The topology that v4l2_m2m_register_media_controller() creates for a
processing block actually created a source-to-source link and a sink-to-sink
link instead of two source-to-sink links.

Unfortunately v4l2-compliance never checked for such bad links, so this
went unreported for quite some time.

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Reported-by: Nicolas Dufresne <nicolas@ndufresne.ca>
Cc: <stable@vger.kernel.org>      # for v4.19 and up
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
5.4-rM2-2.2.x-imx-squashed
Hans Verkuil 2020-02-04 19:13:06 +01:00 committed by Greg Kroah-Hartman
parent cd48f84cf7
commit 8fd458b647
1 changed files with 2 additions and 2 deletions
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4
drivers/media/v4l2-core/v4l2-mem2mem.c
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@ -809,12 +809,12 @@ int v4l2_m2m_register_media_controller(struct v4l2_m2m_dev *m2m_dev,
goto err_rel_entity1;
/* Connect the three entities */
ret = media_create_pad_link(m2m_dev->source, 0, &m2m_dev->proc, 1,
ret = media_create_pad_link(m2m_dev->source, 0, &m2m_dev->proc, 0,
MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED);
if (ret)
goto err_rel_entity2;
ret = media_create_pad_link(&m2m_dev->proc, 0, &m2m_dev->sink, 0,
ret = media_create_pad_link(&m2m_dev->proc, 1, &m2m_dev->sink, 0,
MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED);
if (ret)
goto err_rm_links0;