linux-kernel - Re: [PATCH RESEND] acpi: Fix logging when no pci

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Date:	Wed, 21 Nov 2012 21:50:05 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Joe Perches <joe@...ches.com>
Cc:	Daniel J Blueman <daniel@...ascale-asia.com>,
	Len Brown <lenb@...nel.org>, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND] acpi: Fix logging when no pci_irq is allocated

On Wednesday, November 21, 2012 05:46:04 AM Joe Perches wrote:
> On Wed, 2012-11-21 at 16:43 +0800, Daniel J Blueman wrote:
> > Previously a new line is implicitly added in the no GSI case:
> > 
> > [    7.185182] pci 0001:00:12.0: can't derive routing for PCI INT A
> > [    7.191352] pci 0001:00:12.0: PCI INT A: no GSI
> > [    7.195956]  - using ISA IRQ 10
> > 
> > The code thus prints a blank line where no legacy IRQ is available:
> > 
> > [    1.650124] pci 0000:00:14.0: can't derive routing for PCI INT A
> > [    1.650126] pci 0000:00:14.0: PCI INT A: no GSI
> > [    1.650126] 
> > [    1.650180] pci 0000:00:14.0: can't derive routing for PCI INT A
> > 
> > Fix this by making the newline explicit and removing the superfluous
> > one.
> 
> This breaks the logging code below it when there is an ISA irq.
> 
> The below works, but is a workaround for a defect in the printk
> subsystem introduced by a logging change that will be fixed in
> a near future release.

What exactly do you mean by "near future"?

Rafael


> Signed-off-by: Joe Perches <joe@...ches.com>
> ---
>  drivers/acpi/pci_irq.c |   10 +++++-----
>  1 files changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/acpi/pci_irq.c b/drivers/acpi/pci_irq.c
> index f288e00..68a921d 100644
> --- a/drivers/acpi/pci_irq.c
> +++ b/drivers/acpi/pci_irq.c
> @@ -458,19 +458,19 @@ int acpi_pci_irq_enable(struct pci_dev *dev)
>  	 */
>  	if (gsi < 0) {
>  		u32 dev_gsi;
> -		dev_warn(&dev->dev, "PCI INT %c: no GSI", pin_name(pin));
>  		/* Interrupt Line values above 0xF are forbidden */
>  		if (dev->irq > 0 && (dev->irq <= 0xF) &&
>  		    (acpi_isa_irq_to_gsi(dev->irq, &dev_gsi) == 0)) {
> -			printk(" - using ISA IRQ %d\n", dev->irq);
> +			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);
> -			return 0;
>  		} else {
> -			printk("\n");
> -			return 0;
> +			dev_warn(&dev->dev, "PCI INT %c: no GSI\n",
> +				 pin_name(pin));
>  		}
> +		return 0;
>  	}
>  
>  	rc = acpi_register_gsi(&dev->dev, gsi, triggering, polarity);
> 
> 
> --
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> 
-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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