linux-kernel - Re: [PATCH v3 1/1] i2c: taos-evm: replace simple

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Date:	Sat, 21 Nov 2015 21:10:06 +0100
From:	Jean Delvare <jdelvare@...e.de>
To:	Andy Shevchenko <andy.shevchenko@...il.com>
Cc:	LABBE Corentin <clabbe.montjoie@...il.com>,
	Wolfram Sang <wsa@...-dreams.de>, linux-i2c@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/1] i2c: taos-evm: replace simple_strtoul by
 kstrtou8

Hi Andy,

On Wed, 18 Nov 2015 18:26:25 +0200, Andy Shevchenko wrote:
> On Wed, Nov 18, 2015 at 2:55 PM, LABBE Corentin
> <clabbe.montjoie@...il.com> wrote:
> > The simple_strtoul function is marked as obsolete.
> > This patch replace it by kstrtou8.
> >
> 
> Only one concern. simple_strto* goes through the string until it has
> an invalid character or \0. In your case kstrtou8 will fail the
> transfer. So, is there possible cases when HW returns such data?

It's not supposed to happen.

> And just a style nitpicks below.
> 
> >                 if (p[0] == 'x') {
> > -                       data->byte = simple_strtol(p + 1, NULL, 16);
> > +                       /*
> > +                        * voluntarily dropping error code of kstrtou8 since all
> 
> -> Voluntarily…
> 
> > +                        * error code that it could return are invalid according
> > +                        * to Documentation/i2c/fault-codes
> 
> -> …codes.
> 
> > +                        */
> > +                       if (kstrtou8(p + 1, 16, &data->byte))
> > +                               return -EPROTO;
> 


-- 
Jean Delvare
SUSE L3 Support
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