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media: videobuf2: Add helper to get queue number of buffers

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In the future a side effect of introducing DELETE_BUFS ioctl is
the create of 'holes' (i.e. unused buffers) in bufs arrays.
To know which entries of the bufs arrays are used a bitmap will
be added in struct vb2_queue. That will also mean that the number
of buffers will be computed given the number of bit set in this bitmap.
To smoothly allow this evolution all drives must stop using
directly num_buffers field from struct vb2_queue.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Reviewed-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
This commit is contained in:
Benjamin Gaignard 2023-11-09 17:29:19 +01:00 committed by Mauro Carvalho Chehab
parent 5287f48952
commit 741d0f6b51
1 changed files with 10 additions and 1 deletions
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11
include/media/videobuf2-core.h
View file

@ -1139,6 +1139,15 @@ static inline bool vb2_fileio_is_active(struct vb2_queue *q)
return q->fileio;
}
/**
* vb2_get_num_buffers() - get the number of buffer in a queue
* @q: pointer to &struct vb2_queue with videobuf2 queue.
*/
static inline unsigned int vb2_get_num_buffers(struct vb2_queue *q)
{
return q->num_buffers;
}
/**
* vb2_is_busy() - return busy status of the queue.
* @q: pointer to &struct vb2_queue with videobuf2 queue.
@ -1147,7 +1156,7 @@ static inline bool vb2_fileio_is_active(struct vb2_queue *q)
*/
static inline bool vb2_is_busy(struct vb2_queue *q)
{
return (q->num_buffers > 0);
return vb2_get_num_buffers(q) > 0;
}
/**