If ACPI doesn't find an irq listed, don't accept 0 as a valid PCI irq.
That zero just means that nothing else found any irq information either.
diff --git a/drivers/acpi/pci_irq.c b/drivers/acpi/pci_irq.c
index 8dbf802..d1f42b9 100644
--- a/drivers/acpi/pci_irq.c
+++ b/drivers/acpi/pci_irq.c
@@ -433,7 +433,7 @@
printk(KERN_WARNING PREFIX "PCI Interrupt %s[%c]: no GSI",
pci_name(dev), ('A' + pin));
/* Interrupt Line values above 0xF are forbidden */
- if (dev->irq >= 0 && (dev->irq <= 0xF)) {
+ if (dev->irq > 0 && (dev->irq <= 0xF)) {
printk(" - using IRQ %d\n", dev->irq);
acpi_register_gsi(dev->irq, ACPI_LEVEL_SENSITIVE, ACPI_ACTIVE_LOW);
return_VALUE(0);
