linux-kernel - [PATCH 03/15] x86 acpi/irq: pci device dev->irq is an isa irq not a gsi

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Date:	Tue, 30 Mar 2010 01:07:04 -0700
From:	"Eric W. Biederman" <ebiederm@...ssion.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	linux-kernel@...r.kernel.org, Thomas Renninger <trenn@...e.de>,
	Suresh Siddha <suresh.b.siddha@...el.com>, len.brown@...el.com,
	Tony Luck <tony.luck@...el.com>,
	Fenghua Yu <fenghua.yu@...el.com>, linux-acpi@...r.kernel.org,
	Iranna D Ankad <iranna.ankad@...ibm.com>,
	Gary Hade <garyhade@...ibm.com>,
	Natalie Protasevich <protasnb@...il.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: [PATCH 03/15] x86 acpi/irq: pci device dev->irq is an isa irq not a gsi

From: Eric W. Biederman <ebiederm@...ssion.com>

Strictly speaking on x86 (where acpi is used) dev->irq must be
a dual i8259 irq input aka an isa irq.  Therefore we should translate
that isa irq into a gsi before passing it to a function that
takes a gsi.

Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>
---
 drivers/acpi/pci_irq.c |    8 +++++---
 1 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/acpi/pci_irq.c b/drivers/acpi/pci_irq.c
index 843699e..703541d 100644
--- a/drivers/acpi/pci_irq.c
+++ b/drivers/acpi/pci_irq.c
@@ -400,11 +400,13 @@ 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;
 		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)) {
-			printk(" - using IRQ %d\n", dev->irq);
-			acpi_register_gsi(&dev->dev, dev->irq,
+		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);
+			acpi_register_gsi(&dev->dev, dev_gsi,
 					  ACPI_LEVEL_SENSITIVE,
 					  ACPI_ACTIVE_LOW);
 			return 0;
-- 
1.6.5.2.143.g8cc62

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