linux-kernel - Re: [PATCH v2] mtd: change len type from signed to unsigned type

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Message-ID: <20181115143417.4e0e7dbe@bbrezillon>
Date:   Thu, 15 Nov 2018 14:34:17 +0100
From:   Boris Brezillon <boris.brezillon@...tlin.com>
To:     Huijin Park <huijin.park@...sung.com>
Cc:     Marek Vasut <marek.vasut@...il.com>, linux-mtd@...ts.infradead.org,
        linux-kernel@...r.kernel.org, bbanghj.park@...il.com
Subject: Re: [PATCH v2] mtd: change len type from signed to unsigned type

On Thu, 15 Nov 2018 00:07:10 -0500
Huijin Park <huijin.park@...sung.com> wrote:

> From: "huijin.park" <huijin.park@...sung.com>
> 
> This patch casts the "len" parameter to an unsigned int.

Hm, that's not really what this patch actually. Actually it avoids the
cast from an int to an unsigned int.

> The callers of erase_write() pass the "len" parameter as unsigned int.

That's the important part here. Callers of erase_write() always pass an
unsigned int, so what you're trying to do here is avoid a cast to an
int.

> 
> Signed-off-by: huijin.park <huijin.park@...sung.com>
> ---

You should have a changelog here.

>  drivers/mtd/mtdblock.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/mtd/mtdblock.c b/drivers/mtd/mtdblock.c
> index a5b1933..b2d5ed1 100644
> --- a/drivers/mtd/mtdblock.c
> +++ b/drivers/mtd/mtdblock.c
> @@ -56,7 +56,7 @@ struct mtdblk_dev {
>   */
>  
>  static int erase_write (struct mtd_info *mtd, unsigned long pos,
> -			int len, const char *buf)
> +			unsigned int len, const char *buf)
>  {
>  	struct erase_info erase;
>  	size_t retlen;