[PATCH 6.1 023/272] media: mc: Add num_links flag to media_pad

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6.1-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>

[ Upstream commit baeddf94aa61879b118f2faa37ed126d772670cc ]

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>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 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 688780c8734d4..c7cb49205b017 100644
--- a/drivers/media/mc/mc-entity.c
+++ b/drivers/media/mc/mc-entity.c
@@ -957,6 +957,9 @@ 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
@@ -1068,6 +1071,9 @@ 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 28c9de8a1f348..03bb0963942bd 100644
--- a/include/media/media-entity.h
+++ b/include/media/media-entity.h
@@ -205,6 +205,7 @@ 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>`
@@ -216,6 +217,7 @@ 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;
 
-- 
2.43.0







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