On 02/14/2014 11:41 AM, Hans Verkuil wrote:
> From: Hans Verkuil <hans.verk...@cisco.com>
>
> In __reqbufs() and __create_bufs() the q->num_buffers field was updated
> with the number of newly allocated buffers, but right after that those are
> freed again if some error had occurred before. Move the line updating
> num_buffers to *after* that error check.
>
> Signed-off-by: Hans Verkuil <hans.verk...@cisco.com>
NACK: this is actually correct behavior since __vb2_queue_free() subtracts
'allocated_buffers' from q->num_buffers. A comment mentioning this might be
useful, though.
Regards,
Hans
> ---
> drivers/media/v4l2-core/videobuf2-core.c | 8 ++++----
> 1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/media/v4l2-core/videobuf2-core.c
> b/drivers/media/v4l2-core/videobuf2-core.c
> index ad3db83..96c5ac6 100644
> --- a/drivers/media/v4l2-core/videobuf2-core.c
> +++ b/drivers/media/v4l2-core/videobuf2-core.c
> @@ -848,13 +848,13 @@ static int __reqbufs(struct vb2_queue *q, struct
> v4l2_requestbuffers *req)
> */
> }
>
> - q->num_buffers = allocated_buffers;
> -
> if (ret < 0) {
> __vb2_queue_free(q, allocated_buffers);
> return ret;
> }
>
> + q->num_buffers = allocated_buffers;
> +
> /*
> * Return the number of successfully allocated buffers
> * to the userspace.
> @@ -957,13 +957,13 @@ static int __create_bufs(struct vb2_queue *q, struct
> v4l2_create_buffers *create
> */
> }
>
> - q->num_buffers += allocated_buffers;
> -
> if (ret < 0) {
> __vb2_queue_free(q, allocated_buffers);
> return -ENOMEM;
> }
>
> + q->num_buffers += allocated_buffers;
> +
> /*
> * Return the number of successfully allocated buffers
> * to the userspace.
>
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