diff --git a/[refs] b/[refs]
index d509986d915f..b73c275ac98d 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: d5cdb67236dba94496de052c9f9f431e1fc658f4
+refs/heads/master: 23186279658cea6d42a050400d3e79c56cb459b4
diff --git a/trunk/drivers/pci/setup-bus.c b/trunk/drivers/pci/setup-bus.c
index 47c1071ad84e..54404917be9a 100644
--- a/trunk/drivers/pci/setup-bus.c
+++ b/trunk/drivers/pci/setup-bus.c
@@ -55,12 +55,19 @@ pbus_assign_resources_sorted(struct pci_bus *bus)
 	list_for_each_entry(dev, &bus->devices, bus_list) {
 		u16 class = dev->class >> 8;
 
-		/* Don't touch classless devices or host bridges or ioapics.  */
+		/* Don't touch classless devices or host bridges. */
 		if (class == PCI_CLASS_NOT_DEFINED ||
-		    class == PCI_CLASS_BRIDGE_HOST ||
-		    class == PCI_CLASS_SYSTEM_PIC)
+		    class == PCI_CLASS_BRIDGE_HOST)
 			continue;
 
+		/* Don't touch ioapics if it has the assigned resources. */
+		if (class == PCI_CLASS_SYSTEM_PIC) {
+			res = &dev->resource[0];
+			if (res[0].start || res[1].start || res[2].start ||
+			    res[3].start || res[4].start || res[5].start)
+				continue;
+		}
+
 		pdev_sort_resources(dev, &head);
 	}