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media: vb2: use lock if wait_prepare/finish are NULL

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If the wait_prepare or wait_finish callback is set, then call it.
If it is NULL and the queue lock pointer is not NULL, then just
unlock/lock that mutex.

This allows simplifying drivers by dropping the wait_prepare and
wait_finish ops (and eventually the vb2_ops_wait_prepare/finish helpers).

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Hans Verkuil 2024-09-02 16:04:55 +02:00 committed by Mauro Carvalho Chehab
parent c780d01cf1
commit 88785982a1
1 changed files with 10 additions and 3 deletions
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11
drivers/media/common/videobuf2/videobuf2-core.c
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@ -2035,7 +2035,10 @@ static int __vb2_wait_for_done_vb(struct vb2_queue *q, int nonblocking)
* become ready or for streamoff. Driver's lock is released to
* allow streamoff or qbuf to be called while waiting.
*/
if (q->ops->wait_prepare)
call_void_qop(q, wait_prepare, q);
else if (q->lock)
mutex_unlock(q->lock);
/*
* All locks have been released, it is safe to sleep now.
@ -2045,12 +2048,16 @@ static int __vb2_wait_for_done_vb(struct vb2_queue *q, int nonblocking)
!list_empty(&q->done_list) || !q->streaming ||
q->error);
if (q->ops->wait_finish)
call_void_qop(q, wait_finish, q);
else if (q->lock)
mutex_lock(q->lock);
q->waiting_in_dqbuf = 0;
/*
* We need to reevaluate both conditions again after reacquiring
* the locks or return an error if one occurred.
*/
call_void_qop(q, wait_finish, q);
q->waiting_in_dqbuf = 0;
if (ret) {
dprintk(q, 1, "sleep was interrupted\n");
return ret;