[PATCH] PCI: arch/i386/pci/irq.c should use pci_find_bus

Use pci_find_bus rather than relying on the return value of pci_scan_bus.

arch/i386/pci/irq.c

@@ -102,13 +102,12 @@ static void __init pirq_peer_trick(void)
 #endif
 		busmap[e->bus] = 1;
 	}
-	for(i=1; i<256; i++)
-		/*
-		 *  It might be a secondary bus, but in this case its parent is already
-		 *  known (ascending bus order) and therefore pci_scan_bus returns immediately.
-		 */
-		if (busmap[i] && pci_scan_bus(i, &pci_root_ops, NULL))
+	for(i = 1; i < 256; i++) {
+		if (!busmap[i] || pci_find_bus(0, i))
+			continue;
+		if (pci_scan_bus(i, &pci_root_ops, NULL))
 			printk(KERN_INFO "PCI: Discovered primary peer bus %02x [IRQ]\n", i);
+	}
 	pcibios_last_bus = -1;
 }