Hi Jacopo,
On Tue, Mar 05, 2019 at 07:51:31PM +0100, Jacopo Mondi wrote:
> From: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
>
> Add a helper macro for iterating over pads that are connected through
> enabled routes. This can be used to find all the connected pads within an
> entity, for instance starting from the pad which has been obtained during
> the graph walk.
>
> Signed-off-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
> Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@xxxxxxxxxxxx>
>
> - Make __media_entity_next_routed_pad() return NULL and adjust the
> iterator to handle that
> Signed-off-by: Jacopo Mondi <jacopo+renesas@xxxxxxxxxx>
> ---
> include/media/media-entity.h | 27 +++++++++++++++++++++++++++
> 1 file changed, 27 insertions(+)
>
> diff --git a/include/media/media-entity.h b/include/media/media-entity.h
> index 205561545d7e..82f0bdf2a6d1 100644
> --- a/include/media/media-entity.h
> +++ b/include/media/media-entity.h
> @@ -936,6 +936,33 @@ __must_check int media_graph_walk_init(
> bool media_entity_has_route(struct media_entity *entity, unsigned int pad0,
> unsigned int pad1);
>
> +static inline struct media_pad *__media_entity_next_routed_pad(
> + struct media_pad *start, struct media_pad *iter)
> +{
> + struct media_entity *entity = start->entity;
> +
> + while (iter < &entity->pads[entity->num_pads] &&
> + !media_entity_has_route(entity, start->index, iter->index))
> + iter++;
> +
> + return iter == &entity->pads[entity->num_pads] ? NULL : iter;
Could you use iter <= ...?
It doesn't seem to matter here, but it'd seem safer to change the check.
> +}
> +
> +/**
> + * media_entity_for_each_routed_pad - Iterate over entity pads connected by routes
> + *
> + * @start: The stating pad
> + * @iter: The iterator pad
> + *
> + * Iterate over all pads connected through routes from a given pad
> + * within an entity. The iteration will include the starting pad itself.
> + */
> +#define media_entity_for_each_routed_pad(start, iter) \
> + for (iter = __media_entity_next_routed_pad( \
> + start, (start)->entity->pads); \
> + iter != NULL; \
> + iter = __media_entity_next_routed_pad(start, iter + 1))
> +
> /**
> * media_graph_walk_cleanup - Release resources used by graph walk.
> *
--
Kind regards,
Sakari Ailus
sakari.ailus@xxxxxxxxxxxxxxx
