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[media] s3c-camif: Fail on insufficient number of allocated buffers

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Ensure the driver gets always at least its minimum required
number of buffers allocated by checking actual number of
allocated buffers in vb2_reqbufs(). And free any partially
allocated buffer queue with signaling an error to user space.
Without this patch applications may wait forever to dequeue
a filled buffer, because the hardware didn't even start after
VIDIOC_STREAMON, VIDIOC_QBUF calls, due to insufficient number
of empty buffers.

Reported-by: Alexander Nestorov <alexandernst@gmail.com>
Signed-off-by: Sylwester Nawrocki <sylvester.nawrocki@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Sylwester Nawrocki 2013-02-07 18:36:12 -03:00 committed by Mauro Carvalho Chehab
parent 6aa69f99b2
commit 69b95a3a80
1 changed files with 11 additions and 4 deletions
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15
drivers/media/platform/s3c-camif/camif-capture.c
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@ -934,12 +934,19 @@ static int s3c_camif_reqbufs(struct file *file, void *priv,
vp->owner = NULL;
ret = vb2_reqbufs(&vp->vb_queue, rb);
if (!ret) {
vp->reqbufs_count = rb->count;
if (vp->owner == NULL && rb->count > 0)
vp->owner = priv;
if (ret < 0)
return ret;
if (rb->count && rb->count < CAMIF_REQ_BUFS_MIN) {
rb->count = 0;
vb2_reqbufs(&vp->vb_queue, rb);
ret = -ENOMEM;
}
vp->reqbufs_count = rb->count;
if (vp->owner == NULL && rb->count > 0)
vp->owner = priv;
return ret;
}