linux-kernel - Re: [PATCH v9 4/4] rtc: ds1307: add frequency_test_enable sysfs attribute to check tick on m41txx

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Date:   Thu, 19 Jul 2018 20:19:17 +0200
From:   Giulio Benetti <giulio.benetti@...ronovasrl.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        "open list:REAL TIME CLOCK (RTC) SUBSYSTEM" 
        <linux-rtc@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v9 4/4] rtc: ds1307: add frequency_test_enable sysfs
 attribute to check tick on m41txx

Hi Andy,

Il 18/07/2018 18:26, Andy Shevchenko ha scritto:
> On Wed, Jul 18, 2018 at 5:06 PM, Giulio Benetti
> <giulio.benetti@...ronovasrl.com> wrote:
> 
>>>> +       int ret;
>>>> +
>>>> +       ret = kstrtobool(buf, &freq_test_en);
>>>> +       if (ret == -EINVAL) {
> 
>>> What kind of other error code you may expect and why they are not
>>> considered as no error?
> 
>> According to documentation, kstrtobool can only fail with -EINVAL.
>> See:
>> https://elixir.bootlin.com/linux/v4.18-rc5/source/lib/kstrtox.c#L332
> 
> That's correct. So, what do you want to show by explicitly mentioned
> an error code in the condition?
> 

So you mean I should check for negative values instead of specific 
error, right?

Thanks

Giulio