linux-kernel - Re: [PATCH v2 6/7] gpio: mockup: improve the error message

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Date:   Wed, 31 May 2017 18:00:45 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Bartosz Golaszewski <brgl@...ev.pl>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Alexandre Courbot <gnurou@...il.com>,
        Bamvor Jian Zhang <bamvor.zhangjian@...aro.org>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 6/7] gpio: mockup: improve the error message

On Wed, May 31, 2017 at 1:54 PM, Bartosz Golaszewski <brgl@...ev.pl> wrote:
> 2017-05-30 20:59 GMT+02:00 Andy Shevchenko <andy.shevchenko@...il.com>:
>> On Tue, May 30, 2017 at 11:58 AM, Bartosz Golaszewski <brgl@...ev.pl> wrote:
>>> Indicate the error number and make the message a bit more elaborate.
>>
>>> +                       dev_err(dev,
>>> +                               "adding gpiochip failed: %d (base: %d, ngpio: %d)\n",
>>> +                               ret, base, base < 0 ? ngpio : base + ngpio);
>>
>> You may consider to use
>> 'gpio_mockup_add' instead of 'adding gpiochip'. The latter points the
>> reader first to gpiochip_add family of functions while you run a
>> wrapper on top of it.
>>
>
> But this message can also be emitted if the module params are invalid,
> in which case we don't even enter gpio_mockup_add().

...which unveils bad phrasing in the message. In that case "adding
gpiochip" is also misleading.

I dunno if it requires separate patch to fix the phrasing, though it
would be nice to make it more clear for both cases, or even split to
two cases.

-- 
With Best Regards,
Andy Shevchenko