Do not allow streaming if a pad with MEDIA_PAD_FL_MUST_CONNECT flag is not
connected by an active link.
This patch makes it possible to avoid drivers having to check for the most
common case of link state validation: a sink pad that must be connected.
Signed-off-by: Sakari Ailus <sakari.ailus@xxxxxx>
---
drivers/media/media-entity.c | 34 +++++++++++++++++++++++++++-------
1 file changed, 27 insertions(+), 7 deletions(-)
diff --git a/drivers/media/media-entity.c b/drivers/media/media-entity.c
index cb30ffb..4e58f8a 100644
--- a/drivers/media/media-entity.c
+++ b/drivers/media/media-entity.c
@@ -20,6 +20,7 @@
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
+#include <linux/bitmap.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <media/media-entity.h>
@@ -227,6 +228,7 @@ __must_check int media_entity_pipeline_start(struct media_entity *entity,
media_entity_graph_walk_start(&graph, entity);
while ((entity = media_entity_graph_walk_next(&graph))) {
+ DECLARE_BITMAP(active, entity->num_pads);
unsigned int i;
entity->stream_count++;
@@ -240,21 +242,39 @@ __must_check int media_entity_pipeline_start(struct media_entity *entity,
if (!entity->ops || !entity->ops->link_validate)
continue;
+ bitmap_zero(active, entity->num_pads);
+
for (i = 0; i < entity->num_links; i++) {
struct media_link *link = &entity->links[i];
-
- /* Is this pad part of an enabled link? */
- if (!(link->flags & MEDIA_LNK_FL_ENABLED))
- continue;
-
- /* Are we the sink or not? */
- if (link->sink->entity != entity)
+ struct media_pad *pad = link->sink->entity == entity
+ ? link->sink : link->source;
+
+ /*
+ * Pads that either do not need to connect or
+ * are connected through an enabled link are
+ * fine.
+ */
+ if (!(pad->flags & MEDIA_PAD_FL_MUST_CONNECT)
+ || link->flags & MEDIA_LNK_FL_ENABLED)
+ bitmap_set(active, pad->index, 1);
+
+ /*
+ * Link validation will only take place for
+ * sink ends of the link that are enabled.
+ */
+ if (link->sink != pad
+ || !(link->flags & MEDIA_LNK_FL_ENABLED))
continue;
ret = entity->ops->link_validate(link);
if (ret < 0 && ret != -ENOIOCTLCMD)
goto error;
}
+
+ if (!bitmap_full(active, entity->num_pads)) {
+ ret = -EPIPE;
+ goto error;
+ }
}
mutex_unlock(&mdev->graph_mutex);
--
1.7.10.4
--
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