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authorBjorn Helgaas <bjorn.helgaas@hp.com>2008-12-08 21:31:11 -0700
committerLen Brown <len.brown@intel.com>2008-12-30 21:39:22 -0500
commitee40136313323db1096b17df7b436d22a24ef2be (patch)
treedbe544334f1caf25cc01f7327366372e36486a41 /drivers/acpi/pci_irq.c
parent3b1ea18d3b3542b55861d7f968ded705e3bc2aa6 (diff)
downloadlinux-linaro-stable-ee40136313323db1096b17df7b436d22a24ef2be.tar.gz
ACPI: PCI: follow typical PCI INTx swizzling pattern
No functional change; this just uses the typical pattern of PCI INTx swizzling done on other architectures. Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/acpi/pci_irq.c')
-rw-r--r--drivers/acpi/pci_irq.c11
1 files changed, 7 insertions, 4 deletions
diff --git a/drivers/acpi/pci_irq.c b/drivers/acpi/pci_irq.c
index e42481f64495..b35e64d71409 100644
--- a/drivers/acpi/pci_irq.c
+++ b/drivers/acpi/pci_irq.c
@@ -399,7 +399,7 @@ static struct acpi_prt_entry *
acpi_pci_irq_derive(struct pci_dev *dev, int pin)
{
struct acpi_prt_entry *entry = NULL;
- struct pci_dev *bridge = dev;
+ struct pci_dev *bridge;
u8 bridge_pin = 0, orig_pin = pin;
@@ -407,9 +407,9 @@ acpi_pci_irq_derive(struct pci_dev *dev, int pin)
* Attempt to derive an IRQ for this device from a parent bridge's
* PCI interrupt routing entry (eg. yenta bridge and add-in card bridge).
*/
- while (bridge->bus->self) {
- pin = (((pin - 1) + PCI_SLOT(bridge->devfn)) % 4) + 1;
- bridge = bridge->bus->self;
+ bridge = dev->bus->self;
+ while (bridge) {
+ pin = (((pin - 1) + PCI_SLOT(dev->devfn)) % 4) + 1;
if ((bridge->class >> 8) == PCI_CLASS_BRIDGE_CARDBUS) {
/* PC card has the same IRQ as its cardbridge */
@@ -431,6 +431,9 @@ acpi_pci_irq_derive(struct pci_dev *dev, int pin)
pci_name(bridge)));
return entry;
}
+
+ dev = bridge;
+ bridge = dev->bus->self;
}
dev_warn(&dev->dev, "can't derive routing for PCI INT %c\n",