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Subject: Re: [PATCH] acpi: Fix proper return code for function acpi_gsi_to_irq
To: Mark Salter <msalter@redhat.com>,
        "Rafael J . Wysocki" <rjw@rjwysocki.net>
References: <20170711164543.23439-1-msalter@redhat.com>
Cc: linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org,
        Lorenzo Pieralisi <Lorenzo.Pieralisi@arm.com>
From: Marc Zyngier <marc.zyngier@arm.com>
Organization: ARM Ltd
Message-ID: <da421e2b-a34a-9ef2-d349-87072a8c2e79@arm.com>
Date: Tue, 11 Jul 2017 18:23:14 +0100
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+ Lorenzo, since he deals with ACPI on arm64.

On 11/07/17 17:45, Mark Salter wrote:
> The function acpi_gsi_to_irq must return 0 on success as the caller
> ghes_probe expects an 0 for success. This change also matches x86
> implementation.
> 
> This patch was submitted around 4.5 timeframe but wasn't pushed because
> it didn't fix a real problem. Now that RAS/GHES patches are in kernel,
> this fixes an error seen on a Mustang (arm64) platform:
> 
>     GHES: Failed to map GSI to IRQ for generic hardware error source: 2
>     GHES: probe of GHES.2 failed with error 81
> 
> Signed-off-by: Tuan Phan <tphan@apm.com>
> Signed-off-by: Loc Ho <lho@apm.com>
> [rebased to v4.12-rc]
> Signed-off-by: Mark Salter <msalter@redhat.com>
> ---
>  drivers/acpi/irq.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/acpi/irq.c b/drivers/acpi/irq.c
> index 830299a..7c352cb 100644
> --- a/drivers/acpi/irq.c
> +++ b/drivers/acpi/irq.c
> @@ -24,7 +24,7 @@ static struct fwnode_handle *acpi_gsi_domain_id;
>   *
>   * irq location updated with irq value [>0 on success, 0 on failure]
>   *
> - * Returns: linux IRQ number on success (>0)
> + * Returns: 0 on success
>   *          -EINVAL on failure
>   */
>  int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
> @@ -37,7 +37,7 @@ int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
>  	 * *irq == 0 means no mapping, that should
>  	 * be reported as a failure
>  	 */
> -	return (*irq > 0) ? *irq : -EINVAL;
> +	return (*irq > 0) ? 0 : -EINVAL;
>  }
>  EXPORT_SYMBOL_GPL(acpi_gsi_to_irq);
>  
> 


-- 
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