linux-kernel - Re: [PATCH v2] thermal: rcar_thermal: Use platform_get_irq

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Date:   Sat, 25 Dec 2021 17:55:06 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Cc:     Geert Uytterhoeven <geert+renesas@...der.be>,
        Niklas Söderlund <niklas.soderlund@...natech.se>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Amit Kucheria <amitk@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>,
        Rob Herring <robh+dt@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Prabhakar <prabhakar.csengg@...il.com>,
        "linux-renesas-soc@...r.kernel.org" 
        <linux-renesas-soc@...r.kernel.org>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>
Subject: Re: [PATCH v2] thermal: rcar_thermal: Use platform_get_irq_optional()
 to get the interrupt

On Sat, Dec 25, 2021 at 1:41 PM Andy Shevchenko
<andy.shevchenko@...il.com> wrote:
> On Friday, December 24, 2021, Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com> wrote:

...

>> +               int irq;
>> +
>> +               irq = platform_get_irq_optional(pdev, i);
>> +               if (irq == -ENXIO)
>> +                       break;
>> +               if (irq < 0) {
>> +                       ret = irq;
>> +                       goto error_unregister;
>> +               }
>
>
> In all your patches which introduce optional IRQ please change the logic to the opposite:
>
>   if (irq > 0)
>     ...we got one...
>   if (irq == -EPROBE_DEFER)
>     ...return it, if it is ever possible...
>
> With this you adding me a work.

I noticed that in some patches you actually do the right things, so,
please do it in the same way where you use _optiomal() variant, i.e.

if (ret < 0 && ret != -ENXIO)
  return ret;
if (ret > 0)
  ...we got it...

-- 
With Best Regards,
Andy Shevchenko