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

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Date:   Tue, 13 Nov 2018 01:27:05 +0900
From:   Huijin Park <bbanghj.park@...il.com>
To:     boris.brezillon@...tlin.com
Cc:     huijin.park@...sung.com, marek.vasut@...il.com,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mtd: change len type from signed to unsigned type

Hi Boris,

On Wed, Oct 31, 2018 at 11:02 PM Boris Brezillon
<boris.brezillon@...tlin.com> wrote:
>
> Hi Huijin,
>
> On Thu, 23 Aug 2018 04:43:39 -0400
> Huijin Park <huijin.park@...sung.com> wrote:
>
> > From: "huijin.park" <huijin.park@...sung.com>
> >
> > assign of a signed value which has type 'int' to a variable of
> > a bigger unsigned integer type 'uint64_t'.
>
> Why are you mentioning u64? AFAICT, the len passed to erase_write() is
> always an unsigned int.

It's my mistake.
Messages about u64 are not related to this patch.

>
> > this is ok most of the time, but can lead to unexpectedly large
> > resulting value if the original signed value is negative.
> > in addtion, the callers of the erase_write() pass the len parameter
>
>   ^In addition,
>
> > as unsigned type.
> >
> > Signed-off-by: huijin.park <huijin.park@...sung.com>
> > ---
> >  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)
>
> The diff looks good, but the commit message is not clear at all. Can
> you reword it?
>
> Thanks,
>
> Boris
>
> >  {
> >       struct erase_info erase;
> >       size_t retlen;
>

I will send again patch after reword the commit message.

Thanks & best regards,

Huijin