linux-kernel - Re: [PATCH v2 4/7] acpi: gsi: Always perform an irq domain lookup

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Date:	Fri, 24 Jul 2015 16:34:34 +0800
From:	Hanjun Guo <hanjun.guo@...aro.org>
To:	Marc Zyngier <marc.zyngier@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jiang Liu <jiang.liu@...ux.intel.com>,
	Jason Cooper <jason@...edaemon.net>
CC:	linux-acpi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	Tomasz Nowicki <tomasz.nowicki@...aro.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>,
	Graeme Gregory <graeme@...a.org.uk>
Subject: Re: [PATCH v2 4/7] acpi: gsi: Always perform an irq domain lookup

On 07/23/2015 09:05 PM, Marc Zyngier wrote:
> Instead of directly passing NULL to the various irq_domain functions,
> start by looking up the domain with a domain_token.
>
> As domain_token is permanently set to NULL, the lookup function will
> return the same value (no domain found) and the default will be used,
> preserving the current behaviour.
>
> Signed-off-by: Marc Zyngier <marc.zyngier@....com>
> ---
>   drivers/acpi/gsi.c | 22 +++++++++-------------
>   1 file changed, 9 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/acpi/gsi.c b/drivers/acpi/gsi.c
> index 38208f2..a745880 100644
> --- a/drivers/acpi/gsi.c
> +++ b/drivers/acpi/gsi.c
> @@ -14,6 +14,8 @@
>
>   enum acpi_irq_model_id acpi_irq_model;
>
> +static void *acpi_gsi_domain_token;
> +
>   static unsigned int acpi_gsi_get_irq_type(int trigger, int polarity)
>   {
>   	switch (polarity) {
> @@ -45,12 +47,9 @@ static unsigned int acpi_gsi_get_irq_type(int trigger, int polarity)
>    */
>   int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
>   {
> -	/*
> -	 * Only default domain is supported at present, always find
> -	 * the mapping corresponding to default domain by passing NULL
> -	 * as irq_domain parameter
> -	 */
> -	*irq = irq_find_mapping(NULL, gsi);
> +	struct irq_domain *d = irq_find_matching_host(acpi_gsi_domain_token);

Typo, should be irq_find_host() or
irq_find_matching_host(acpi_gsi_domain_token, DOMAIN_BUS_ANY),
it removed in later patch, so no compile error happened when
whole patch set applied.

Other than that,

Reviewed-by: Hanjun Guo <hanjun.guo@...aro.org>

Thanks
Hanjun
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