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media: vb2: Introduce a vb2_get_buffer accessor

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Some drivers need to access a vb2 buffer from its
queue index. Introduce an accessor to abstract this,
and avoid drivers from accessing private members.

Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Ezequiel Garcia 2019-06-10 16:55:22 -04:00 committed by Mauro Carvalho Chehab
parent a84e355ecd
commit 3dd8c09754
1 changed files with 18 additions and 0 deletions
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18
include/media/videobuf2-core.h
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@ -1163,6 +1163,24 @@ static inline void vb2_clear_last_buffer_dequeued(struct vb2_queue *q)
q->last_buffer_dequeued = false;
}
/**
* vb2_get_buffer() - get a buffer from a queue
* @q: pointer to &struct vb2_queue with videobuf2 queue.
* @index: buffer index
*
* This function obtains a buffer from a queue, by its index.
* Keep in mind that there is no refcounting involved in this
* operation, so the buffer lifetime should be taken into
* consideration.
*/
static inline struct vb2_buffer *vb2_get_buffer(struct vb2_queue *q,
unsigned int index)
{
if (index < q->num_buffers)
return q->bufs[index];
return NULL;
}
/*
* The following functions are not part of the vb2 core API, but are useful
* functions for videobuf2-*.