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Subject: media: mc: Add num_links flag to media_pad
Author: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxx # 6.1
Signed-off-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
Acked-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xxxxxxxxx>
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;
