linux-kernel - Re: [PATCH] mmc: core: convert simple

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Message-ID: <ZuhMdXFhhVUXh8Il@black.fi.intel.com>
Date: Mon, 16 Sep 2024 18:19:17 +0300
From: Andy Shevchenko <andriy.shevchenko@...el.com>
To: Ulf Hansson <ulf.hansson@...aro.org>
Cc: Riyan Dhiman <riyandhiman14@...il.com>, linux-mmc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mmc: core: convert simple_stroul to kstroul

On Tue, Sep 03, 2024 at 02:37:25PM +0200, Ulf Hansson wrote:
> On Sun, 1 Sept 2024 at 20:22, Riyan Dhiman <riyandhiman14@...il.com> wrote:
> >
> > simple_strtoul() is obsolete and lacks proper error handling, making it
> > unsafe for converting strings to unsigned long values. Replace it with
> > kstrtoul(), which provides robust error checking and better safety.
> >
> > This change improves the reliability of the string-to-integer conversion
> > and aligns with current kernel coding standards. Error handling is added
> > to catch conversion failures, returning -EINVAL when input is invalid.
> >
> > Issue reported by checkpatch:
> > - WARNING: simple_strtoul is obsolete, use kstrtoul instead

In rare cases this is a false positive, here seems to be okay.

...

> > +       if (kstrtoul(buf, 0, &set)) {
> >                 ret = -EINVAL;
> >                 goto out;
> >         }

Now you shadow the error code of kstrtox(), this has to be as simple as

       ret = kstrtoul(buf, 0, &set);
       if (ret)
               goto out;

-- 
With Best Regards,
Andy Shevchenko