diff --git a/[refs] b/[refs]
index d7470b7fda5b..d00cfcf6fda7 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 068258bc15439c11a966e873f931cc8e513dca61
+refs/heads/master: 79af72d716cf1bb13b175429cf181a6c4d063ee8
diff --git a/trunk/include/linux/pci.h b/trunk/include/linux/pci.h
index 1216843412da..50d94388e87c 100644
--- a/trunk/include/linux/pci.h
+++ b/trunk/include/linux/pci.h
@@ -357,6 +357,15 @@ struct pci_bus {
 #define pci_bus_b(n)	list_entry(n, struct pci_bus, node)
 #define to_pci_bus(n)	container_of(n, struct pci_bus, dev)
 
+/*
+ * Returns true if the pci bus is root (behind host-pci bridge),
+ * false otherwise
+ */
+static inline bool pci_is_root_bus(struct pci_bus *pbus)
+{
+	return !(pbus->parent);
+}
+
 #ifdef CONFIG_PCI_MSI
 static inline bool pci_dev_msi_enabled(struct pci_dev *pci_dev)
 {