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Subject: media: mc: Add num_links flag to media_pad Author: Laurent Pinchart laurent.pinchart@ideasonboard.com Date: Mon Jan 15 00:30:02 2024 +0200

Maintain a counter of the links connected to a pad in the media_pad structure. This helps checking if a pad is connected to anything, which will be used in the pipeline building code.

Cc: stable@vger.kernel.org # 6.1 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

drivers/media/mc/mc-entity.c | 6 ++++++ include/media/media-entity.h | 2 ++ 2 files changed, 8 insertions(+)

---

diff --git a/drivers/media/mc/mc-entity.c b/drivers/media/mc/mc-entity.c index 7839e3f68efa..c2d8f59b62c1 100644 --- a/drivers/media/mc/mc-entity.c +++ b/drivers/media/mc/mc-entity.c @@ -1038,6 +1038,9 @@ static void __media_entity_remove_link(struct media_entity *entity,

/* Remove the reverse links for a data link. */ if ((link->flags & MEDIA_LNK_FL_LINK_TYPE) == MEDIA_LNK_FL_DATA_LINK) { + link->source->num_links--; + link->sink->num_links--; + if (link->source->entity == entity) remote = link->sink->entity; else @@ -1143,6 +1146,9 @@ media_create_pad_link(struct media_entity *source, u16 source_pad, sink->num_links++; source->num_links++;

+ link->source->num_links++; + link->sink->num_links++; + return 0; } EXPORT_SYMBOL_GPL(media_create_pad_link); diff --git a/include/media/media-entity.h b/include/media/media-entity.h index c79176ed6299..0393b23129eb 100644 --- a/include/media/media-entity.h +++ b/include/media/media-entity.h @@ -225,6 +225,7 @@ enum media_pad_signal_type { * @graph_obj: Embedded structure containing the media object common data * @entity: Entity this pad belongs to * @index: Pad index in the entity pads array, numbered from 0 to n + * @num_links: Number of links connected to this pad * @sig_type: Type of the signal inside a media pad * @flags: Pad flags, as defined in * :ref:`include/uapi/linux/media.h <media_header>` @@ -236,6 +237,7 @@ struct media_pad { struct media_gobj graph_obj; /* must be first field in struct */ struct media_entity *entity; u16 index; + u16 num_links; enum media_pad_signal_type sig_type; unsigned long flags;