diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 0082d699be94b4c28e1820351916568e68a684bb..b236069ff0d823ce92a84222494d42bdfa97c20c 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -874,6 +874,7 @@ int __ref online_pages(unsigned long pfn, unsigned long nr_pages, int online_typ
 	 */
 	mem = find_memory_block(__pfn_to_section(pfn));
 	nid = mem->nid;
+	put_device(&mem->dev);
 
 	/* associate pfn range with the zone */
 	zone = move_pfn_range(online_type, nid, pfn, nr_pages);