diff --git a/[refs] b/[refs]
index e32756b506f3..9f9a3526efa0 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 88efd0bbc0fe403a9948e6f94cc48b9f15ee4861
+refs/heads/master: 1c388919d89ca35741e9c4d3255adf87f76f0c06
diff --git a/trunk/include/linux/ioport.h b/trunk/include/linux/ioport.h
index e9bb22cba764..63eb429ecbe6 100644
--- a/trunk/include/linux/ioport.h
+++ b/trunk/include/linux/ioport.h
@@ -132,6 +132,7 @@ extern int allocate_resource(struct resource *root, struct resource *new,
 						       resource_size_t,
 						       resource_size_t),
 			     void *alignf_data);
+struct resource *lookup_resource(struct resource *root, resource_size_t start);
 int adjust_resource(struct resource *res, resource_size_t start,
 		    resource_size_t size);
 resource_size_t resource_alignment(struct resource *res);
diff --git a/trunk/kernel/resource.c b/trunk/kernel/resource.c
index 3ff40178dce7..3b3cedc52592 100644
--- a/trunk/kernel/resource.c
+++ b/trunk/kernel/resource.c
@@ -553,6 +553,27 @@ int allocate_resource(struct resource *root, struct resource *new,
 
 EXPORT_SYMBOL(allocate_resource);
 
+/**
+ * lookup_resource - find an existing resource by a resource start address
+ * @root: root resource descriptor
+ * @start: resource start address
+ *
+ * Returns a pointer to the resource if found, NULL otherwise
+ */
+struct resource *lookup_resource(struct resource *root, resource_size_t start)
+{
+	struct resource *res;
+
+	read_lock(&resource_lock);
+	for (res = root->child; res; res = res->sibling) {
+		if (res->start == start)
+			break;
+	}
+	read_unlock(&resource_lock);
+
+	return res;
+}
+
 /*
  * Insert a resource into the resource tree. If successful, return NULL,
  * otherwise return the conflicting resource (compare to __request_resource())