diff --git a/drivers/base/base.h b/drivers/base/base.h
index b696651..b405436 100644
--- a/drivers/base/base.h
+++ b/drivers/base/base.h
@@ -65,6 +65,7 @@ struct driver_private {
  *	binding of drivers which were unable to get all the resources needed by
  *	the device; typically because it depends on another driver getting
  *	probed first.
+ * @async_driver - pointer to device driver awaiting probe via async_probe
  * @device - pointer back to the struct device that this structure is
  * associated with.
  * @dead - This device is currently either in the process of or has been
@@ -80,6 +81,7 @@ struct device_private {
 	struct klist_node knode_bus;
 	struct klist_node knode_class;
 	struct list_head deferred_probe;
+	struct device_driver *async_driver;
 	struct device *device;
 	u8 dead:1;
 };