[PATCH v3 1/2] acpi: Fix proper return code for function acpi_gsi_to_irq

[Tuan Phan]

On Tue, Jan 12, 2016 at 10:32 AM, Borislav Petkov <bp at alien8.de> wrote:
> On Tue, Jan 12, 2016 at 10:26:04AM -0800, Tuan Phan wrote:
>> So are you good with it?
>
> How about this instead:
>
> ---
> diff --git a/drivers/acpi/gsi.c b/drivers/acpi/gsi.c
> index fa4585a6914e..e42f6b7eac13 100644
> --- a/drivers/acpi/gsi.c
> +++ b/drivers/acpi/gsi.c
> @@ -46,17 +46,22 @@ static unsigned int acpi_gsi_get_irq_type(int trigger, int polarity)
>   * Returns: linux IRQ number on success (>0)
>   *          -EINVAL on failure
>   */
> -int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
> +int acpi_gsi_to_irq(u32 gsi)
>  {
> +       unsigned int irq;
> +
>         struct irq_domain *d = irq_find_matching_fwnode(acpi_gsi_domain_id,
>                                                         DOMAIN_BUS_ANY);
>
> -       *irq = irq_find_mapping(d, gsi);
> +       irq = irq_find_mapping(d, gsi);
>         /*
>          * *irq == 0 means no mapping, that should
>          * be reported as a failure
>          */
> -       return (*irq > 0) ? *irq : -EINVAL;
> +       if (irq > 0)
> +               return irq;
> +       else
> +               return -EINVAL;
>  }
>  EXPORT_SYMBOL_GPL(acpi_gsi_to_irq);

Well, it basically the same as old code except the change of API
interface. And it requires some changes in ACPI core and X86/I64 arch
code. Do we really want to go with this solution instead of just
return 0 on success and -EINVAL on failure?

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