Re: [PATCH v2 13/22] media: Use entity enums in graph walk

[Mauro Carvalho Chehab <mchehab@osg.samsung.com>]

Em Sun, 29 Nov 2015 21:20:14 +0200
Sakari Ailus <sakari.ailus@iki.fi> escreveu:

> This will also mean that the necessary graph related data structures will
> be allocated dynamically, removing the need for maximum ID checks.

Looks OK to me, and explains one of the things I pointed on a previous
patch.

> 
> Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
> ---
>  drivers/media/media-entity.c | 16 ++++++----------
>  include/media/media-entity.h |  2 +-
>  2 files changed, 7 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/media/media-entity.c b/drivers/media/media-entity.c
> index 4161dc7..7429c03 100644
> --- a/drivers/media/media-entity.c
> +++ b/drivers/media/media-entity.c
> @@ -366,7 +366,7 @@ static struct media_entity *stack_pop(struct media_entity_graph *graph)
>  __must_check int media_entity_graph_walk_init(
>  	struct media_entity_graph *graph, struct media_device *mdev)
>  {
> -	return 0;
> +	return media_entity_enum_init(&graph->entities, mdev);
>  }
>  EXPORT_SYMBOL_GPL(media_entity_graph_walk_init);
>  
> @@ -376,6 +376,7 @@ EXPORT_SYMBOL_GPL(media_entity_graph_walk_init);
>   */
>  void media_entity_graph_walk_cleanup(struct media_entity_graph *graph)
>  {
> +	media_entity_enum_cleanup(&graph->entities);
>  }
>  EXPORT_SYMBOL_GPL(media_entity_graph_walk_cleanup);
>  
> @@ -395,14 +396,11 @@ EXPORT_SYMBOL_GPL(media_entity_graph_walk_cleanup);
>  void media_entity_graph_walk_start(struct media_entity_graph *graph,
>  				   struct media_entity *entity)
>  {
> +	media_entity_enum_zero(&graph->entities);
> +	media_entity_enum_set(&graph->entities, entity);
> +
>  	graph->top = 0;
>  	graph->stack[graph->top].entity = NULL;
> -	bitmap_zero(graph->entities, MEDIA_ENTITY_ENUM_MAX_ID);
> -
> -	if (WARN_ON(media_entity_id(entity) >= MEDIA_ENTITY_ENUM_MAX_ID))
> -		return;
> -
> -	__set_bit(media_entity_id(entity), graph->entities);
>  	stack_push(graph, entity);
>  }
>  EXPORT_SYMBOL_GPL(media_entity_graph_walk_start);
> @@ -445,11 +443,9 @@ media_entity_graph_walk_next(struct media_entity_graph *graph)
>  
>  		/* Get the entity in the other end of the link . */
>  		next = media_entity_other(entity, link);
> -		if (WARN_ON(media_entity_id(next) >= MEDIA_ENTITY_ENUM_MAX_ID))
> -			return NULL;
>  
>  		/* Has the entity already been visited? */
> -		if (__test_and_set_bit(media_entity_id(next), graph->entities)) {
> +		if (media_entity_enum_test_and_set(&graph->entities, next)) {
>  			link_top(graph) = link_top(graph)->next;
>  			continue;
>  		}
> diff --git a/include/media/media-entity.h b/include/media/media-entity.h
> index f0652e2..8122736 100644
> --- a/include/media/media-entity.h
> +++ b/include/media/media-entity.h
> @@ -109,8 +109,8 @@ struct media_entity_graph {
>  		struct list_head *link;
>  	} stack[MEDIA_ENTITY_ENUM_MAX_DEPTH];
>  
> -	DECLARE_BITMAP(entities, MEDIA_ENTITY_ENUM_MAX_ID);
>  	int top;
> +	struct media_entity_enum entities;
>  };
>  
>  /*