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media: videobuf2: Update vb2_is_busy() logic

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Do not rely on the number of allocated buffers to know if the
queue is busy but on a flag set when at least one buffer has been allocated
by REQBUFS or CREATE_BUFS ioctl.
The flag is reset when REQBUFS is called with count = 0 or the file
handle is closed.
This is needed because remove buffers feature will be able to remove
all the buffers from a queue while streaming so relying on the number
of allocated buffers in the queue won't be possible.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Reviewed-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
This commit is contained in:
Benjamin Gaignard 2024-03-14 16:32:18 +01:00 committed by Hans Verkuil
parent cc4cce95a9
commit d7cdb5946f
2 changed files with 7 additions and 1 deletions
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4
drivers/media/common/videobuf2/videobuf2-core.c
View file

@ -854,6 +854,7 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory,
__vb2_queue_free(q, q_num_bufs);
mutex_unlock(&q->mmap_lock);
q->is_busy = 0;
/*
* In case of REQBUFS(0) return immediately without calling
* driver's queue_setup() callback and allocating resources.
@ -966,6 +967,7 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory,
*/
*count = allocated_buffers;
q->waiting_for_buffers = !q->is_output;
q->is_busy = 1;
return 0;
@ -1091,6 +1093,7 @@ int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory,
* to the userspace.
*/
*count = allocated_buffers;
q->is_busy = 1;
return 0;
@ -2555,6 +2558,7 @@ void vb2_core_queue_release(struct vb2_queue *q)
__vb2_queue_free(q, vb2_get_num_buffers(q));
kfree(q->bufs);
q->bufs = NULL;
q->is_busy = 0;
mutex_unlock(&q->mmap_lock);
}
EXPORT_SYMBOL_GPL(vb2_core_queue_release);

4
include/media/videobuf2-core.h
View file

@ -582,6 +582,7 @@ struct vb2_buf_ops {
* released. Used to prevent destroying the queue by other threads.
* @is_multiplanar: set if buffer type is multiplanar
* @is_output: set if buffer type is output
* @is_busy: set if at least one buffer has been allocated at some time.
* @copy_timestamp: set if vb2-core should set timestamps
* @last_buffer_dequeued: used in poll() and DQBUF to immediately return if the
* last decoded buffer was already dequeued. Set for capture queues
@ -647,6 +648,7 @@ struct vb2_queue {
unsigned int waiting_in_dqbuf:1;
unsigned int is_multiplanar:1;
unsigned int is_output:1;
unsigned int is_busy:1;
unsigned int copy_timestamp:1;
unsigned int last_buffer_dequeued:1;
@ -1166,7 +1168,7 @@ static inline unsigned int vb2_get_num_buffers(struct vb2_queue *q)
*/
static inline bool vb2_is_busy(struct vb2_queue *q)
{
return vb2_get_num_buffers(q) > 0;
return !!q->is_busy;
}
/**