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author | Ezequiel Garcia <ezequiel@collabora.com> | 2019-06-10 16:55:22 -0400 |
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committer | Mauro Carvalho Chehab <mchehab+samsung@kernel.org> | 2019-06-21 16:20:23 -0400 |
commit | 3dd8c097541794c82913092030ad22f8a4cafec1 (patch) | |
tree | fcca1f25a51fd292580c556e4bd2d55eb730d891 | |
parent | a84e355ecd3ed9759d7aaa40170aab78e2a68a06 (diff) | |
download | lwn-3dd8c097541794c82913092030ad22f8a4cafec1.tar.gz lwn-3dd8c097541794c82913092030ad22f8a4cafec1.zip |
media: vb2: Introduce a vb2_get_buffer accessor
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>
-rw-r--r-- | include/media/videobuf2-core.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h index c03ef7cc5071..640aabe69450 100644 --- a/include/media/videobuf2-core.h +++ b/include/media/videobuf2-core.h @@ -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-*. |