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SubjectRe: [PATCH] irqchip/renesas-intc-irqpin: Use platform_get_irq_optional() to get the interrupt
Hi Geert,

Thank you for the review.

On Thu, Dec 16, 2021 at 8:45 AM Geert Uytterhoeven <geert@linux-m68k.org> wrote:
>
> Hi Prabhakar,
>
> On Thu, Dec 16, 2021 at 12:45 AM Lad Prabhakar
> <prabhakar.mahadev-lad.rj@bp.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 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_optional().
> >
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
>
> > --- a/drivers/irqchip/irq-renesas-intc-irqpin.c
> > +++ b/drivers/irqchip/irq-renesas-intc-irqpin.c
>
> > @@ -418,12 +417,14 @@ static int intc_irqpin_probe(struct platform_device *pdev)
> >
> > /* allow any number of IRQs between 1 and INTC_IRQPIN_MAX */
> > for (k = 0; k < INTC_IRQPIN_MAX; k++) {
> > - irq = platform_get_resource(pdev, IORESOURCE_IRQ, k);
> > - if (!irq)
> > + ret = platform_get_irq_optional(pdev, k);
> > + if (ret == -EPROBE_DEFER)
> > + goto err0;
> > + if (ret < 0)
> > break;
>
> Shouldn't all errors be considered fatal, except for -ENXIO (no
> interrupt)?
>
Initial behavior of this driver was even if one
platform_get_resource() succeeded the probe continued further, this is
the same behavior which I wanted to keep with this code while using
platform_get_irq_optional(). But as you pointed out I'll change it to below:

+ ret = platform_get_irq(pdev, k);
+ if (ret < 0)
+ goto err0;

We bail out any error case and will also drop the check for (nirqs < 1).

Cheers,
Prabhakar
> >
> > p->irq[k].p = p;
> > - p->irq[k].requested_irq = irq->start;
> > + p->irq[k].requested_irq = ret;
> > }
> >
> > nirqs = k;
>
> Gr{oetje,eeting}s,
>
> Geert
>
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
>
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
> -- Linus Torvalds

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