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| author | Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> | 2013-06-07 19:45:11 +0400 |
|---|---|---|
| committer | Mauro Carvalho Chehab <m.chehab@samsung.com> | 2013-08-18 14:16:48 +0400 |
| commit | 5c7b25b90d36942c524d06522ebaf0510a75592a (patch) | |
| tree | 979e3f88bf6e507021c28ac3e9236f7d5cc3bfa9 /include/media/media-entity.h | |
| parent | 3a9677063f00a61b6067a07df3d7ee12eace79b7 (diff) | |
| download | linux-5c7b25b90d36942c524d06522ebaf0510a75592a.tar.xz | |
[media] media: Add support for circular graph traversal
The graph traversal API (media_entity_graph_walk_*) doesn't support
cyclic graphs and will fail to correctly walk a graph when circular
links exist. Support circular graph traversal by checking whether an
entity has already been visited before pushing it to the stack.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Acked-by: Sakari Ailus <sakari.ailus@iki.fi>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
Diffstat (limited to 'include/media/media-entity.h')
| -rw-r--r-- | include/media/media-entity.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/media/media-entity.h b/include/media/media-entity.h index 06bacf937d61..10df55187981 100644 --- a/include/media/media-entity.h +++ b/include/media/media-entity.h @@ -23,6 +23,7 @@ #ifndef _MEDIA_ENTITY_H #define _MEDIA_ENTITY_H +#include <linux/bitops.h> #include <linux/list.h> #include <linux/media.h> @@ -113,12 +114,15 @@ static inline u32 media_entity_subtype(struct media_entity *entity) } #define MEDIA_ENTITY_ENUM_MAX_DEPTH 16 +#define MEDIA_ENTITY_ENUM_MAX_ID 64 struct media_entity_graph { struct { struct media_entity *entity; int link; } stack[MEDIA_ENTITY_ENUM_MAX_DEPTH]; + + DECLARE_BITMAP(entities, MEDIA_ENTITY_ENUM_MAX_ID); int top; }; |