linux-kernel - Re: [PATCH] watchdog: s3c2410: Use platform_get

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Message-ID: <CA+V-a8v6-zO6rYDHyFsPZ15YyjVaoP9A=WWNLXaVfY=Kkgrr+g@mail.gmail.com>
Date:   Thu, 16 Dec 2021 21:42:58 +0000
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Linux Watchdog Mailing List <linux-watchdog@...r.kernel.org>,
        LAK <linux-arm-kernel@...ts.infradead.org>,
        linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>
Subject: Re: [PATCH] watchdog: s3c2410: Use platform_get_irq() to get the interrupt

Hi Guenter,

Thank you for the review.

On Thu, Dec 16, 2021 at 7:01 PM Guenter Roeck <linux@...ck-us.net> wrote:
>
> On 12/16/21 10:36 AM, Lad Prabhakar wrote:
> > platform_get_resource(pdev, IORESOURCE_IRQ, ..) relies on static
> > allocation of IRQ resources in DT core code, this causes an issue
> > when using hierarchical interrupt domains using "interrupts" property
> > in the node as this bypassed the hierarchical setup and messed up the
> > irq chaining.
> >
> > In preparation for removal of static setup of IRQ resource from DT core
> > code use platform_get_irq().
> >
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > ---
> >   drivers/watchdog/s3c2410_wdt.c | 13 ++++++-------
> >   1 file changed, 6 insertions(+), 7 deletions(-)
> >
> > diff --git a/drivers/watchdog/s3c2410_wdt.c b/drivers/watchdog/s3c2410_wdt.c
> > index 2395f353e52d..f5aced344b7b 100644
> > --- a/drivers/watchdog/s3c2410_wdt.c
> > +++ b/drivers/watchdog/s3c2410_wdt.c
> > @@ -513,9 +513,9 @@ static int s3c2410wdt_probe(struct platform_device *pdev)
> >   {
> >       struct device *dev = &pdev->dev;
> >       struct s3c2410_wdt *wdt;
> > -     struct resource *wdt_irq;
> >       unsigned int wtcon;
> >       int started = 0;
> > +     int wdt_irq;
> >       int ret;
> >
> >       wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL);
> > @@ -536,10 +536,9 @@ static int s3c2410wdt_probe(struct platform_device *pdev)
> >               }
> >       }
> >
> > -     wdt_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
> > -     if (wdt_irq == NULL) {
> > -             dev_err(dev, "no irq resource specified\n");
> > -             ret = -ENOENT;
> > +     wdt_irq = platform_get_irq(pdev, 0);
> > +     if (wdt_irq < 0) {
> > +             ret = wdt_irq;
> >               goto err;
>
> All those "goto err;" statements in this function are pointless since they
> just return ret. Since this is the first of those goto statements, please
> replace it with "return wdt_irq;".
>
Sure will do and post a v2.

> Thanks,
> Guenter
>
> >       }
> >
> > @@ -592,8 +591,8 @@ static int s3c2410wdt_probe(struct platform_device *pdev)
> >                       dev_info(dev, "default timer value is out of range, cannot start\n");
> >       }
> >
> > -     ret = devm_request_irq(dev, wdt_irq->start, s3c2410wdt_irq, 0,
> > -                             pdev->name, pdev);
> > +     ret = devm_request_irq(dev, wdt_irq, s3c2410wdt_irq, 0,
> > +                            pdev->name, pdev);
> >       if (ret != 0) {
> >               dev_err(dev, "failed to install irq (%d)\n", ret);
> >               goto err_cpufreq;
> >
>
Cheers,
Prabhakar