linux-kernel - Re: [PATCH v2 7/7] acpi: gsi: Cleanup acpi_register

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Date:	Fri, 24 Jul 2015 17:17:39 +0100
From:	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:	Marc Zyngier <marc.zyngier@....com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Jiang Liu <jiang.liu@...ux.intel.com>,
	Jason Cooper <jason@...edaemon.net>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Tomasz Nowicki <tomasz.nowicki@...aro.org>,
	"hanjun.guo@...aro.org" <hanjun.guo@...aro.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	"suravee.suthikulpanit@....com" <suravee.suthikulpanit@....com>,
	Graeme Gregory <graeme@...a.org.uk>
Subject: Re: [PATCH v2 7/7] acpi: gsi: Cleanup acpi_register_gsi

On Thu, Jul 23, 2015 at 02:05:13PM +0100, Marc Zyngier wrote:
> As the only user of drivers/acpi/gsi.c is now using acpi_set_irq_model
> to set acpi_gsi_descriptor_populate to something meaningful, we can
> always rely on that information to be present (its absence is an error),
> and guarantee that new interrupt controllers will use this API.
> 
> Take this opportunity to cleanup acpi_register_gsi.
> 
> Signed-off-by: Marc Zyngier <marc.zyngier@....com>
> ---
>  drivers/acpi/gsi.c | 24 ++++++++----------------
>  1 file changed, 8 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/acpi/gsi.c b/drivers/acpi/gsi.c
> index e6f4a0c..85aa831 100644
> --- a/drivers/acpi/gsi.c
> +++ b/drivers/acpi/gsi.c
> @@ -75,28 +75,20 @@ int acpi_register_gsi(struct device *dev, u32 gsi, int trigger,
>  		      int polarity)
>  {
>  	int err;
> -	unsigned int irq;
> +	struct acpi_gsi_descriptor data;
>  	unsigned int irq_type = acpi_gsi_get_irq_type(trigger, polarity);
>  	struct irq_domain *d = irq_find_host(acpi_gsi_domain_token);
>  
> -	if (acpi_gsi_descriptor_populate) {
> -		struct acpi_gsi_descriptor data;
> -		err = acpi_gsi_descriptor_populate(&data, gsi, irq_type);
> -		if (err)
> -			return err;
> -
> -		return irq_create_acpi_mapping(d, &data);
> +	if (WARN_ON(!acpi_gsi_descriptor_populate)) {
> +		pr_warn("GSI: No registered irqchip, giving up\n");
> +		return -EINVAL;
>  	}
>  
> -	irq = irq_create_mapping(d, gsi);
> -	if (!irq)
> -		return -EINVAL;
> +	err = acpi_gsi_descriptor_populate(&data, gsi, irq_type);
> +	if (err)
> +		return err;
>  
> -	/* Set irq type if specified and different than the current one */
> -	if (irq_type != IRQ_TYPE_NONE &&
> -		irq_type != irq_get_trigger_type(irq))
> -		irq_set_irq_type(irq, irq_type);
> -	return irq;
> +	return irq_create_acpi_mapping(d, &data);
>  }
>  EXPORT_SYMBOL_GPL(acpi_register_gsi);

Reviewed-by: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
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