linux-kernel - Re: [PATCH v2 1/1] ACPI, PCI, ISA: Call ISA-specific code only for architectures which support ISA.

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Date:	Wed, 19 Feb 2014 17:11:10 +0100
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Tomasz Nowicki <tomasz.nowicki@...aro.org>
Cc:	lenb@...nel.org, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org, linaro-acpi@...ts.linaro.org
Subject: Re: [PATCH v2 1/1] ACPI, PCI, ISA: Call ISA-specific code only for architectures which support ISA.

On Wednesday, February 19, 2014 11:35:22 AM Tomasz Nowicki wrote:
> This commit moves ISA-specific code to separate function and makes that
> function depend on CONFIG_{E}ISA so that we do not have to maintain
> acpi_isa_irq_to_gsi() function for architectures which do not support ISA.
> 
> Signed-off-by: Tomasz Nowicki <tomasz.nowicki@...aro.org>
> ---
>  drivers/acpi/pci_irq.c |   35 +++++++++++++++++++++++++----------
>  1 file changed, 25 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/acpi/pci_irq.c b/drivers/acpi/pci_irq.c
> index 361b40c..0a553a0 100644
> --- a/drivers/acpi/pci_irq.c
> +++ b/drivers/acpi/pci_irq.c
> @@ -370,6 +370,30 @@ static struct acpi_prt_entry *acpi_pci_irq_lookup(struct pci_dev *dev, int pin)
>  	return NULL;
>  }
>  
> +#if IS_ENABLED(CONFIG_ISA) || IS_ENABLED(CONFIG_EISA)
> +static int acpi_isa_register_gsi(struct pci_dev *dev)
> +{
> +	u32 dev_gsi;
> +
> +	/* Interrupt Line values above 0xF are forbidden */
> +	if (dev->irq > 0 && (dev->irq <= 0xF) &&
> +	    (acpi_isa_irq_to_gsi(dev->irq, &dev_gsi) == 0)) {
> +		dev_warn(&dev->dev, "PCI INT %c: no GSI - using ISA IRQ %d\n",
> +			 pin_name(dev->pin), dev->irq);
> +		acpi_register_gsi(&dev->dev, dev_gsi,
> +				  ACPI_LEVEL_SENSITIVE,
> +				  ACPI_ACTIVE_LOW);
> +		return 0;
> +	}
> +	return -EINVAL;
> +}
> +#else
> +static inline int acpi_isa_register_gsi(struct pci_dev *dev)
> +{
> +	return -ENODEV;
> +}
> +#endif
> +
>  int acpi_pci_irq_enable(struct pci_dev *dev)
>  {
>  	struct acpi_prt_entry *entry;
> @@ -416,16 +440,7 @@ int acpi_pci_irq_enable(struct pci_dev *dev)
>  	 * driver reported one, then use it. Exit in any case.
>  	 */
>  	if (gsi < 0) {
> -		u32 dev_gsi;
> -		/* Interrupt Line values above 0xF are forbidden */
> -		if (dev->irq > 0 && (dev->irq <= 0xF) &&
> -		    (acpi_isa_irq_to_gsi(dev->irq, &dev_gsi) == 0)) {
> -			dev_warn(&dev->dev, "PCI INT %c: no GSI - using ISA IRQ %d\n",
> -				 pin_name(pin), dev->irq);
> -			acpi_register_gsi(&dev->dev, dev_gsi,
> -					  ACPI_LEVEL_SENSITIVE,
> -					  ACPI_ACTIVE_LOW);
> -		} else {
> +		if (acpi_isa_register_gsi(dev)) {

The curly brackets are not necessary here and you can even move the below into
acpi_isa_register_gsi().

>  			dev_warn(&dev->dev, "PCI INT %c: no GSI\n",
>  				 pin_name(pin));
>  		}
> 

-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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