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

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Message-ID: <CA+V-a8uejJk+-hWWH81whaBbkMJQ3EoeRmxKGDB3HJ5v__0qVw@mail.gmail.com>
Date:	Mon, 18 May 2015 09:06:22 +0100
From:	"Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:	Michal Kubecek <mkubecek@...e.cz>
Cc:	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

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.

Cheers,
--Prabhakar Lad
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