diff options
| author | Sylwester Nawrocki <sylvester.nawrocki@gmail.com> | 2013-02-08 01:36:12 +0400 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2013-03-05 21:53:47 +0400 |
| commit | 69b95a3a80b44ebb71bf153e79bcb8580e1d3de5 (patch) | |
| tree | f253d9be9bc959805dbda0af47b48da90069bc37 /drivers/media/platform/s3c-camif/camif-capture.c | |
| parent | 6aa69f99b2ecc7f9b387fcf22d30e6601b58819f (diff) | |
| download | linux-69b95a3a80b44ebb71bf153e79bcb8580e1d3de5.tar.xz | |
[media] s3c-camif: Fail on insufficient number of allocated buffers
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>
Diffstat (limited to 'drivers/media/platform/s3c-camif/camif-capture.c')
| -rw-r--r-- | drivers/media/platform/s3c-camif/camif-capture.c | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/drivers/media/platform/s3c-camif/camif-capture.c b/drivers/media/platform/s3c-camif/camif-capture.c index e91f350929eb..70438a0f62ae 100644 --- a/drivers/media/platform/s3c-camif/camif-capture.c +++ b/drivers/media/platform/s3c-camif/camif-capture.c @@ -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; } |