6.8-stable review patch. If anyone has any objections, please let me know.
------------------
From: Laurent Pinchart laurent.pinchart@ideasonboard.com
[ Upstream commit 78f0daa026d4c5e192d31801d1be6caf88250220 ]
When building pipelines by following links, the media_pipeline_explore_next_link() function only traverses enabled links. The remote pad of a disabled link is not added to the pipeline, and neither is the local pad. While the former is correct as disabled links should not be followed, not adding the local pad breaks processing of the MEDIA_PAD_FL_MUST_CONNECT flag.
The MEDIA_PAD_FL_MUST_CONNECT flag is checked in the __media_pipeline_start() function that iterates over all pads after populating the pipeline. If the pad is not present, the check gets skipped, rendering it useless.
Fix this by adding the local pad of all links regardless of their state, only skipping the remote pad for disabled links.
Cc: stable@vger.kernel.org # 6.1 Fixes: ae219872834a ("media: mc: entity: Rewrite media_pipeline_start()") Reported-by: Frieder Schrempf frieder.schrempf@kontron.de Closes: https://lore.kernel.org/linux-media/7658a15a-80c5-219f-2477-2a94ba6c6ba1@kon... Signed-off-by: Laurent Pinchart laurent.pinchart@ideasonboard.com Acked-by: Sakari Ailus sakari.ailus@linux.intel.com Signed-off-by: Hans Verkuil hverkuil-cisco@xs4all.nl Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/media/mc/mc-entity.c | 18 +++++++++--------- 1 file changed, 9 insertions(+), 9 deletions(-)
diff --git a/drivers/media/mc/mc-entity.c b/drivers/media/mc/mc-entity.c index 543a392f86357..a6f28366106fb 100644 --- a/drivers/media/mc/mc-entity.c +++ b/drivers/media/mc/mc-entity.c @@ -620,13 +620,6 @@ static int media_pipeline_explore_next_link(struct media_pipeline *pipe, link->source->entity->name, link->source->index, link->sink->entity->name, link->sink->index);
- /* Skip links that are not enabled. */ - if (!(link->flags & MEDIA_LNK_FL_ENABLED)) { - dev_dbg(walk->mdev->dev, - "media pipeline: skipping link (disabled)\n"); - return 0; - } - /* Get the local pad and remote pad. */ if (link->source->entity == pad->entity) { local = link->source; @@ -648,13 +641,20 @@ static int media_pipeline_explore_next_link(struct media_pipeline *pipe, }
/* - * Add the local and remote pads of the link to the pipeline and push - * them to the stack, if they're not already present. + * Add the local pad of the link to the pipeline and push it to the + * stack, if not already present. */ ret = media_pipeline_add_pad(pipe, walk, local); if (ret) return ret;
+ /* Similarly, add the remote pad, but only if the link is enabled. */ + if (!(link->flags & MEDIA_LNK_FL_ENABLED)) { + dev_dbg(walk->mdev->dev, + "media pipeline: skipping link (disabled)\n"); + return 0; + } + ret = media_pipeline_add_pad(pipe, walk, remote); if (ret) return ret;