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[media] media: Add support for circular graph traversal

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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 <[email protected]>
Acked-by: Sakari Ailus <[email protected]>
Acked-by: Hans Verkuil <[email protected]>
Signed-off-by: Mauro Carvalho Chehab <[email protected]>
This commit is contained in:
Laurent Pinchart 2013-06-07 12:45:11 -03:00 • committed by Mauro Carvalho Chehab
commit 5c7b25b90d
2 changed files with 15 additions and 3 deletions
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4
include/media/media-entity.h
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@ -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;
};