Iterating over the links for an entity is a somewhat common need
through the media subsystem, but generally the assumption is that
they will all be data links. To meet that assumption add a new macro
that iterates through an entity's links and skips non-data links.
Signed-off-by: Daniel Scally <djrscally@xxxxxxxxx>
---
include/media/media-entity.h | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)
diff --git a/include/media/media-entity.h b/include/media/media-entity.h
index a9a1c0ec5d1c..b13f67f33508 100644
--- a/include/media/media-entity.h
+++ b/include/media/media-entity.h
@@ -550,6 +550,32 @@ static inline bool media_entity_enum_intersects(
min(ent_enum1->idx_max, ent_enum2->idx_max));
}
+static inline struct media_link *
+__media_entity_next_data_link(struct media_entity *entity,
+ struct media_link *pos)
+{
+ if (!pos) {
+ list_for_each_entry(pos, &entity->links, list)
+ if ((pos->flags & MEDIA_LNK_FL_LINK_TYPE) ==
+ MEDIA_LNK_FL_DATA_LINK)
+ return pos;
+
+ return NULL;
+ }
+
+ list_for_each_entry_continue(pos, &entity->links, list)
+ if ((pos->flags & MEDIA_LNK_FL_LINK_TYPE) ==
+ MEDIA_LNK_FL_DATA_LINK)
+ return pos;
+
+ return NULL;
+}
+
+#define for_each_media_entity_data_link(entity, pos) \
+ for (pos = __media_entity_next_data_link(entity, NULL); \
+ pos; \
+ pos = __media_entity_next_data_link(entity, pos))
+
/**
* gobj_to_entity - returns the struct &media_entity pointer from the
* @gobj contained on it.
--
2.25.1
