linux-kernel - Re: [PATCH] ACPI: irq: Fix the incorrect return value in acpi_register

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Message-ID: <CAJZ5v0hCaXxYSmjWorbM2AEoCJrJk06xCY5Fq-geM945vOE86w@mail.gmail.com>
Date:   Wed, 18 Oct 2023 13:13:23 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Sunil V L <sunilvl@...tanamicro.com>
Cc:     linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Agustin Vega-Frias <agustinv@...eaurora.org>,
        Hanjun Guo <guohanjun@...wei.com>,
        Marc Zyngier <maz@...nel.org>,
        Anup Patel <apatel@...tanamicro.com>
Subject: Re: [PATCH] ACPI: irq: Fix the incorrect return value in acpi_register_gsi()

On Mon, Oct 16, 2023 at 7:09 PM Sunil V L <sunilvl@...tanamicro.com> wrote:
>
> acpi_register_gsi() should return negative value in case of failure.
> Currently, it returns the return value from irq_create_fwspec_mapping().
> However, irq_create_fwspec_mapping() returns 0 for failure. Fix the issue
> by returning -EINVAL if irq_create_fwspec_mapping() returns zero.
>
> Fixes: d44fa3d46079 ("ACPI: Add support for ResourceSource/IRQ domain mapping")
> Signed-off-by: Sunil V L <sunilvl@...tanamicro.com>
> ---
>  drivers/acpi/irq.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/acpi/irq.c b/drivers/acpi/irq.c
> index c2c786eb95ab..403f33df66af 100644
> --- a/drivers/acpi/irq.c
> +++ b/drivers/acpi/irq.c
> @@ -57,6 +57,7 @@ int acpi_register_gsi(struct device *dev, u32 gsi, int trigger,
>                       int polarity)
>  {
>         struct irq_fwspec fwspec;
> +       unsigned int rc;
>
>         fwspec.fwnode = acpi_get_gsi_domain_id(gsi);
>         if (WARN_ON(!fwspec.fwnode)) {
> @@ -68,7 +69,11 @@ int acpi_register_gsi(struct device *dev, u32 gsi, int trigger,
>         fwspec.param[1] = acpi_dev_get_irq_type(trigger, polarity);
>         fwspec.param_count = 2;
>
> -       return irq_create_fwspec_mapping(&fwspec);
> +       rc = irq_create_fwspec_mapping(&fwspec);
> +       if (!rc)
> +               return -EINVAL;
> +
> +       return rc;
>  }
>  EXPORT_SYMBOL_GPL(acpi_register_gsi);
>
> --

Good catch!

Applied as 6.7 material, but I renamed the new rc local variable to irq.

Thanks!