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:	Thu, 20 Feb 2014 14:27:18 +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 Thursday, February 20, 2014 11:44:34 AM Tomasz Nowicki wrote:
> On 19.02.2014 17:11, Rafael J. Wysocki wrote:
> > 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().
> Right, the curly brackets can be removed.
> 
> My intention was to print warning when ISA is not supported too, and do 
> not put dev_warn() into both version of acpi_isa_register_gsi(). So I 
> would leave code below as it is.

OK

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