On Sat, Mar 1, 2014 at 2:41 AM, Hans Verkuil <hverkuil@xxxxxxxxx> wrote:
> From: Ricardo Ribalda Delgado <ricardo.ribalda@xxxxxxxxx>
>
> This patch adds a test preventing streamon() if there is no buffer
> ready.
>
> Without this patch, a user could call streamon() before
> preparing any buffer. This leads to a situation where if he calls
> close() before calling streamoff() the device is kept streaming.
>
> Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@xxxxxxxxx>
> Signed-off-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
Acked-by: Pawel Osciak <pawel@xxxxxxxxxx>
> ---
> drivers/media/v4l2-core/videobuf2-core.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/drivers/media/v4l2-core/videobuf2-core.c b/drivers/media/v4l2-core/videobuf2-core.c
> index 5a5fb7f..a127925 100644
> --- a/drivers/media/v4l2-core/videobuf2-core.c
> +++ b/drivers/media/v4l2-core/videobuf2-core.c
> @@ -1776,6 +1776,11 @@ static int vb2_internal_streamon(struct vb2_queue *q, enum v4l2_buf_type type)
> return 0;
> }
>
> + if (!q->num_buffers) {
> + dprintk(1, "streamon: no buffers have been allocated\n");
> + return -EINVAL;
> + }
> +
> /*
> * If any buffers were queued before streamon,
> * we can now pass them to driver for processing.
> --
> 1.9.rc1
>
--
Best regards,
Pawel Osciak
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