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media: mc: Add num_links flag to media_pad

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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>
This commit is contained in:
Laurent Pinchart 2024-01-15 00:30:02 +02:00 committed by Hans Verkuil
parent eb2f932100
commit baeddf94aa
2 changed files with 8 additions and 0 deletions
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6
drivers/media/mc/mc-entity.c
View File

@ -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);

2
include/media/media-entity.h
View File

@ -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;