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From:   Andy Shevchenko <andy.shevchenko@gmail.com>
Date:   Sat, 25 Dec 2021 19:39:56 +0200
Message-ID: <CAHp75VdXKVAZMKqC=0RbkAKKxFsdcxBc0M3N6OQMivHj-w+DHw@mail.gmail.com>
Subject: Re: [PATCH] irqchip/renesas-irqc: Use platform_get_irq_optional() to
 get the interrupt
To:     "Lad, Prabhakar" <prabhakar.csengg@gmail.com>
Cc:     Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Marc Zyngier <maz@kernel.org>,
        Rob Herring <robh+dt@kernel.org>,
        Geert Uytterhoeven <geert+renesas@glider.be>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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On Sat, Dec 25, 2021 at 7:28 PM Lad, Prabhakar
<prabhakar.csengg@gmail.com> wrote:
> On Sat, Dec 25, 2021 at 4:46 PM Andy Shevchenko
> <andy.shevchenko@gmail.com> wrote:
> > On Thu, Dec 16, 2021 at 9:52 AM Lad Prabhakar
> > <prabhakar.mahadev-lad.rj@bp.renesas.com> wrote:

> > ret = platform_get_irq_optional(...);
> > if (ret < 0 && ret != -ENXIO)
> >   return ret;
> > if (ret > 0)
> >   ...we got it...
> >
> > It will allow the future API fix of platform_get_irq_optional() to be
> > really optional.
> >
> Later patch [0] (merged into -next) does check for -ENXIO first.
>
> [0] https://lore.kernel.org/lkml/20211216182121.5323-1-prabhakar.mahadev-lad.rj@bp.renesas.com/t/

The problem is that it doesn't consider 0 as no IRQ.

-- 
With Best Regards,
Andy Shevchenko