Re: [PATCH] Clarify expression which uses both multiplication and pointer dereference

Michal Kubecek
2015-05-18T06:52:02Z

On Sun, May 17, 2015 at 07:18:42PM +0200, Alex Dowad wrote:
> This fixes a checkpatch style error in vpfe_buffer_queue_setup.
>
> Signed-off-by: Alex Dowad <alexinbeijing@gmail.com>
> ---
> drivers/staging/media/davinci_vpfe/vpfe_video.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/staging/media/davinci_vpfe/vpfe_video.c b/drivers/staging/media/davinci_vpfe/vpfe_video.c
> index 06d48d5..04a687c 100644
> --- a/drivers/staging/media/davinci_vpfe/vpfe_video.c
> +++ b/drivers/staging/media/davinci_vpfe/vpfe_video.c
> @@ -1095,7 +1095,7 @@ vpfe_buffer_queue_setup(struct vb2_queue *vq, const struct v4l2_format *fmt,
> size = video->fmt.fmt.pix.sizeimage;
>
> if (vpfe_dev->video_limit) {
> - while (size * *nbuffers > vpfe_dev->video_limit)
> + while (size * (*nbuffers) > vpfe_dev->video_limit)
> (*nbuffers)--;
> }
> if (pipe->state == VPFE_PIPELINE_STREAM_CONTINUOUS) {

Style issue aside, is there a reason not to use

if (size * *nbuffers > vpfe_dev->video_limit)
*nbuffers = vpfe_dev->video_limit / size;

instead?

Michal Kubecek