[PATCH] correct irq logic for x86

We must not look for a PCI IRQ for a non native mode IDE device
We must write PCI_INTERRUPT_LINE for VIA

arch/i386/pci/irq.c

@@ -804,6 +804,7 @@ void pcibios_penalize_isa_irq(int irq)
 int pirq_enable_irq(struct pci_dev *dev)
 {
 	u8 pin;
+	extern int interrupt_line_quirk;
 	pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
 	if (pin && !pcibios_lookup_irq(dev, 1) && !dev->irq) {
 		char *msg;
@@ -813,9 +814,17 @@ int pirq_enable_irq(struct pci_dev *dev)
 			msg = "";
 		else
 			msg = " Please try using pci=biosirq.";
+			
+		/* With IDE legacy devices the IRQ lookup failure is not a problem.. */
+		if (dev->class >> 8 == PCI_CLASS_STORAGE_IDE && !(dev->class & 0x5))
+			return;
+			
 		printk(KERN_WARNING "PCI: No IRQ known for interrupt pin %c of device %s.%s\n",
 		       'A' + pin - 1, dev->slot_name, msg);
 	}
-
+	/* VIA bridges use interrupt line for apic/pci steering across
+	   the V-Link */
+	else if (interrupt_line_quirk)
+		pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
 	return 0;
 }