linux-kernel - Re: [PATCH v1 1/1] iio: adc: qcom-spmi-adc5: Fix the channel name

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Message-ID: <Y8ejxsqeHL/pBTAY@smile.fi.intel.com>
Date:   Wed, 18 Jan 2023 09:46:14 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Marijn Suijten <marijn.suijten@...ainline.org>
Cc:     Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Nuno Sá <nuno.sa@...log.com>,
        linux-arm-msm@...r.kernel.org, linux-iio@...r.kernel.org,
        linux-kernel@...r.kernel.org, Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>
Subject: Re: [PATCH v1 1/1] iio: adc: qcom-spmi-adc5: Fix the channel name

On Wed, Jan 18, 2023 at 12:12:04AM +0100, Marijn Suijten wrote:
> On 2023-01-17 11:39:44, Andy Shevchenko wrote:
> > The node name can contain an address part which is not used by
> > the driver. Cut it out before assigning the channel name.
> 
> This explanation doesn't cut it.  It's not that the driver "doesn't use"

Driver doesn't use it still. There is no contradiction, but I agree that
below part is good to have in the commit message.

> the address part, it is that this string is propagated into the
> userspace label, sysfs /filenames/ *and breaking ABI*.

So I will add it into v2 in case the fix works (see below).

...

> > -	const char *name = fwnode_get_name(fwnode), *channel_name;
> > +	const char *name, *channel_name;
> 
> I don't think this'll compile as name is still a pointer to const data,
> while you're assigning (a '\0' char) to it below.

Right, it's always hard for me to compile things for ARM on x86 :-)
Thanks for catching this up!

But does this fix the issue after compilation fix?

-- 
With Best Regards,
Andy Shevchenko