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[media] media-device: supress backlinks at G_TOPOLOGY ioctl 

Due to the graph traversal algorithm currently in usage, we
need a copy of all data links. Those backlinks should not be
send to userspace, as otherwise, all links there will be
duplicated.

Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Mauro Carvalho Chehab 2015-08-30 09:53:57 -03:00
parent 28b6ba1106
commit 39d1ebc609
3 changed files with 6 additions and 0 deletions
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3
drivers/media/media-device.c
View File

@ -333,6 +333,9 @@ static long __media_device_get_topology(struct media_device *mdev,
/* Get links and number of links */
i = 0;
media_device_for_each_link(link, mdev) {
if (link->is_backlink)
continue;
i++;
if (ret || !topo->links)

1
drivers/media/media-entity.c
View File

@ -625,6 +625,7 @@ media_create_pad_link(struct media_entity *source, u16 source_pad,
backlink->source = &source->pads[source_pad];
backlink->sink = &sink->pads[sink_pad];
backlink->flags = flags;
backlink->is_backlink = true;
/* Initialize graph object embedded at the new link */
media_gobj_init(sink->graph_obj.mdev, MEDIA_GRAPH_LINK,

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

@ -96,6 +96,7 @@ struct media_pipeline {
* @reverse: Pointer to the link for the reverse direction of a pad to pad
* link.
* @flags: Link flags, as defined in uapi/media.h (MEDIA_LNK_FL_*)
* @is_backlink: Indicate if the link is a backlink.
*/
struct media_link {
struct media_gobj graph_obj;
@ -112,6 +113,7 @@ struct media_link {
};
struct media_link *reverse;
unsigned long flags;
bool is_backlink;
};
/**