diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c
index 510a9452429848d20abae91b47a9005aa95c4b8f..1c0a39d8b04e5de9474cf2b0ec967a8633fca3fe 100644
--- a/drivers/acpi/dock.c
+++ b/drivers/acpi/dock.c
@@ -627,6 +627,7 @@ static int dock_add(acpi_handle handle)
 	INIT_LIST_HEAD(&dock_station->hotplug_devices);
 	spin_lock_init(&dock_station->dd_lock);
 	spin_lock_init(&dock_station->hp_lock);
+	ATOMIC_INIT_NOTIFIER_HEAD(&dock_notifier_list);
 
 	/* Find dependent devices */
 	acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,