linux-kernel - Re: [PATCH] ACPI: fix the process flow for 0 which return from acpi_register

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Date:   Wed, 12 Oct 2016 10:05:53 +0800
From:   Hanjun Guo <guohanjun@...wei.com>
To:     MaJun <majun258@...wei.com>, <linux-kernel@...r.kernel.org>,
        <marc.zyngier@....com>, <linux-acpi@...r.kernel.org>,
        <rjw@...ysocki.net>, <lenb@...nel.org>
CC:     <dingtianhong@...wei.com>
Subject: Re: [PATCH] ACPI: fix the process flow for 0 which return from
 acpi_register_gsi

On 2016/10/12 9:20, MaJun wrote:
> The return value 0 from acpi_register_gsi() means irq mapping failed.
> So, we should process this case in else branch.
>
> Signed-off-by: MaJun <majun258@...wei.com>
> ---
>  drivers/acpi/resource.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/acpi/resource.c b/drivers/acpi/resource.c
> index 56241eb..9918326 100644
> --- a/drivers/acpi/resource.c
> +++ b/drivers/acpi/resource.c
> @@ -416,7 +416,7 @@ static void acpi_dev_get_irqresource(struct resource *res, u32 gsi,
>  
>  	res->flags = acpi_dev_irq_flags(triggering, polarity, shareable);
>  	irq = acpi_register_gsi(NULL, gsi, triggering, polarity);
> -	if (irq >= 0) {
> +	if (irq > 0) {

On x86 or IA64, irq 0 is a valid irq number as far as I know.

Thanks
Hanjun