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

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Message-ID: <CA+V-a8vvt_MmO8=WhnYuYowhQwuJSV8qh+Y3-0cZVmA5DwZ1Gw@mail.gmail.com>
Date:	Mon, 18 May 2015 11:06:43 +0100
From:	"Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:	Hans Verkuil <hverkuil@...all.nl>
Cc:	Michal Kubecek <mkubecek@...e.cz>,
	Alex Dowad <alexinbeijing@...il.com>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Hans Verkuil <hans.verkuil@...co.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Ramakrishnan Muthukrishnan <ramakrmu@...co.com>,
	"open list:MEDIA INPUT INFRA..." <linux-media@...r.kernel.org>,
	"open list:STAGING SUBSYSTEM <devel@...verdev.osuosl.org>, open list" 
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Clarify expression which uses both multiplication and
 pointer dereference

Hi Hans,

On Mon, May 18, 2015 at 9:15 AM, Hans Verkuil <hverkuil@...all.nl> wrote:
>
>
> On 05/18/2015 10:06 AM, Lad, Prabhakar wrote:
>> On Mon, May 18, 2015 at 7:51 AM, Michal Kubecek <mkubecek@...e.cz> wrote:
>>> 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@...il.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?
>>>
>> I would prefer this.
>
> As far as I can see video_limit is never set at all, so this code (and the video_limit
> field) can just be removed.
>
> I think this is a left-over from old code, long since removed.
>
Yes makes sense, I'll fix it up and post a patch for it.

Cheers,
--Prabhakar Lad
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