Re: [RFC PATCH v2 05/21] pnp.h: Return -EPROBE_DEFER for disabled IRQ resource in pnp_irq()

[Rafael J. Wysocki]

On Wed, Oct 25, 2023 at 10:24 PM Sunil V L <sunilvl@xxxxxxxxxxxxxxxx> wrote:
>
> To support deferred PNP driver probe, pnp_irq() must return -EPROBE_DEFER
> so that the device driver can do deferred probe if the interrupt controller
> is not probed early.
>
> Signed-off-by: Sunil V L <sunilvl@xxxxxxxxxxxxxxxx>
> ---
>  include/linux/pnp.h | 10 ++++++++--
>  1 file changed, 8 insertions(+), 2 deletions(-)
>
> diff --git a/include/linux/pnp.h b/include/linux/pnp.h
> index c2a7cfbca713..21cf833789fb 100644
> --- a/include/linux/pnp.h
> +++ b/include/linux/pnp.h
> @@ -147,12 +147,18 @@ static inline resource_size_t pnp_mem_len(struct pnp_dev *dev,
>  }
>
>
> -static inline resource_size_t pnp_irq(struct pnp_dev *dev, unsigned int bar)
> +static inline int pnp_irq(struct pnp_dev *dev, unsigned int bar)
>  {
>         struct resource *res = pnp_get_resource(dev, IORESOURCE_IRQ, bar);
>
> -       if (pnp_resource_valid(res))
> +       if (pnp_resource_valid(res)) {
> +#if IS_ENABLED(CONFIG_ARCH_ACPI_DEFERRED_GSI)
> +               if (!pnp_resource_enabled(res))
> +                       return -EPROBE_DEFER;
> +#endif

What would be wrong with

if (IS_ENABLED(CONFIG_ARCH_ACPI_DEFERRED_GSI) && !pnp_resource_enabled(res))
        return -EPROBE_DEFER;

?

> +
>                 return res->start;
> +       }
>         return -1;
>  }
>
> --
> 2.39.2
>