[1/1] media: entity: Add media_entity_has_route() function

  From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

This is a wrapper around the media entity has_route operation.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
---
Hi Niklas,

There was actually another problem with the Kerneldoc comment related to
the mutex. Fixed that one as well.

Kind regards,
Sakari

 drivers/media/media-entity.c | 16 ++++++++++++++++
 include/media/media-entity.h | 17 +++++++++++++++++
 2 files changed, 33 insertions(+)
  

Hi Sakari,

Thanks, I will use this one in my next iteration of the VIN patches.

On 2016-11-08 14:54:28 +0200, Sakari Ailus wrote:
> From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> 
> This is a wrapper around the media entity has_route operation.
> 
> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> Signed-off-by: Michal Simek <michal.simek@xilinx.com>
> Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
> ---
> Hi Niklas,
> 
> There was actually another problem with the Kerneldoc comment related to
> the mutex. Fixed that one as well.
> 
> Kind regards,
> Sakari
> 
>  drivers/media/media-entity.c | 16 ++++++++++++++++
>  include/media/media-entity.h | 17 +++++++++++++++++
>  2 files changed, 33 insertions(+)
> 
> diff --git a/drivers/media/media-entity.c b/drivers/media/media-entity.c
> index 5734bb9..7de08e1 100644
> --- a/drivers/media/media-entity.c
> +++ b/drivers/media/media-entity.c
> @@ -242,6 +242,22 @@ EXPORT_SYMBOL_GPL(media_entity_pads_init);
>   * Graph traversal
>   */
>  
> +bool media_entity_has_route(struct media_entity *entity, unsigned int pad0,
> +			    unsigned int pad1)
> +{
> +	if (pad0 >= entity->num_pads || pad1 >= entity->num_pads)
> +		return false;
> +
> +	if (pad0 == pad1)
> +		return true;
> +
> +	if (!entity->ops || !entity->ops->has_route)
> +		return true;
> +
> +	return entity->ops->has_route(entity, pad0, pad1);
> +}
> +EXPORT_SYMBOL_GPL(media_entity_has_route);
> +
>  static struct media_entity *
>  media_entity_other(struct media_entity *entity, struct media_link *link)
>  {
> diff --git a/include/media/media-entity.h b/include/media/media-entity.h
> index 2060e48..aa8d3c5 100644
> --- a/include/media/media-entity.h
> +++ b/include/media/media-entity.h
> @@ -834,6 +834,23 @@ __must_check int media_entity_graph_walk_init(
>  	struct media_entity_graph *graph, struct media_device *mdev);
>  
>  /**
> + * media_entity_has_route - Check if two entity pads are connected internally
> + *
> + * @entity: The entity
> + * @pad0: The first pad index
> + * @pad1: The second pad index
> + *
> + * This function can be used to check whether two pads of an entity are
> + * connected internally in the entity.
> + *
> + * The caller must hold entity->graph_obj.mdev->mutex.
> + *
> + * Return: true if the pads are connected internally and false otherwise.
> + */
> +bool media_entity_has_route(struct media_entity *entity, unsigned int pad0,
> +			    unsigned int pad1);
> +
> +/**
>   * media_entity_graph_walk_cleanup - Release resources used by graph walk.
>   *
>   * @graph: Media graph structure that will be used to walk the graph
> -- 
> 2.7.4
>