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Subject: media: v4l2-mem2mem.c: fix broken links Author: Hans Verkuil hverkuil-cisco@xs4all.nl Date: Tue Feb 4 19:13:06 2020 +0100

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

drivers/media/v4l2-core/v4l2-mem2mem.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)

---

diff --git a/drivers/media/v4l2-core/v4l2-mem2mem.c b/drivers/media/v4l2-core/v4l2-mem2mem.c index 1afd9c6ad908..cc34c5ab7009 100644 --- a/drivers/media/v4l2-core/v4l2-mem2mem.c +++ b/drivers/media/v4l2-core/v4l2-mem2mem.c @@ -880,12 +880,12 @@ 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;