linux-kernel - Re: [PATCH v3 03/10] ata: pata_of_platform: Use platform_get_irq

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Date:   Sat, 25 Dec 2021 17:13:05 +0000
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
        Sergey Shtylyov <s.shtylyov@....ru>,
        Rob Herring <robh+dt@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "open list:LIBATA SUBSYSTEM (Serial and Parallel ATA drivers)" 
        <linux-ide@...r.kernel.org>
Subject: Re: [PATCH v3 03/10] ata: pata_of_platform: Use platform_get_irq_optional()
 to get the interrupt

Hi Andy,

Thank you for the review.

On Sat, Dec 25, 2021 at 5:02 PM Andy Shevchenko
<andy.shevchenko@...il.com> wrote:
>
> On Sat, Dec 25, 2021 at 3:55 AM Lad Prabhakar
> <prabhakar.mahadev-lad.rj@...renesas.com> 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 bypasses the hierarchical setup and messes up the
> > irq chaining.
> >
> > In preparation for removal of static setup of IRQ resource from DT core
> > code use platform_get_irq_optional().
>
> ...
>
> > +       irq = platform_get_irq_optional(ofdev, 0);
> > +       if (irq < 0 && irq != -ENXIO)
> > +               return irq;
> > +
> > +       if (irq > 0) {
>
> > +               memset(&irq_res, 0x0, sizeof(struct resource));
>
> Why do you need that variable at all?
>
Are you referring to the irq_res variable? That's because
__pata_platform_probe() requires it.

> 0x0 -> 0
> sizeof(irq_res)
>
OK, I will update it.

Cheers,
Prabhakar