linux-kernel - Re: [PATCH v1 01/11] mfd: intel_soc_pmic_bxtwc: Don't shadow error codes in show()/store()

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Message-ID: <Yrxi8xKjVXsckrWX@google.com>
Date:   Wed, 29 Jun 2022 15:34:27 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     linux-kernel@...r.kernel.org, Andy Shevchenko <andy@...nel.org>
Subject: Re: [PATCH v1 01/11] mfd: intel_soc_pmic_bxtwc: Don't shadow error
 codes in show()/store()

On Tue, 28 Jun 2022, Andy Shevchenko wrote:

> On Tue, Jun 28, 2022 at 10:47:10AM +0100, Lee Jones wrote:
> > On Tue, 28 Jun 2022, Andy Shevchenko wrote:
> > > On Mon, Jun 27, 2022 at 10:05:07AM +0100, Lee Jones wrote:
> > > > On Thu, 16 Jun 2022, Andy Shevchenko wrote:
> 
> ...
> 
> > > > > +	ret = kstrtoul(buf, 0, &bxtwc_reg_addr);
> > > > > +	if (ret) {
> > > > >  		dev_err(dev, "Invalid register address\n");
> > > > 
> > > > Is that really what failure means, on every failure?
> > > > 
> > > >   "Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing
> > > >    error."
> > > 
> > > As far as I can see in either case the address is invalid.
> > > Basically we may drop this confusing error message here, if
> > > this what you prefer.
> > 
> > Your call.  I just wanted you to consider it for a moment.
> 
> Userspace will print an error based on the error code, so
> I would rather remove _this_ message since it doesn't add
> value, esp. when we could have -ERANGE.

Works for me.

-- 
Lee Jones [李琼斯]
Principal Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
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