Right now we are using find_memory_block() to get the node id for the
pfn range to online. We are missing to drop a reference to the memory
block device. While the device still gets unregistered via
device_unregister(), resulting in no user visible problem, the device is
never released via device_release(), resulting in a memory leak. Fix
that by properly using a put_device().
Fixes: d0dc12e86b31 ("mm/memory_hotplug: optimize memory hotplug")
Cc: Andrew Morton <a...@linux-foundation.org>
Cc: Oscar Salvador <osalva...@suse.de>
Cc: Michal Hocko <mho...@suse.com>
Cc: David Hildenbrand <da...@redhat.com>
Cc: Pavel Tatashin <pasha.tatas...@soleen.com>
Cc: Wei Yang <richard.weiy...@gmail.com>
Cc: Qian Cai <c...@lca.pw>
Cc: Arun KS <aru...@codeaurora.org>
Cc: Mathieu Malaterre <ma...@debian.org>
Reviewed-by: Oscar Salvador <osalva...@suse.de>
Reviewed-by: Wei Yang <richard.weiy...@gmail.com>
Acked-by: Michal Hocko <mho...@suse.com>
Signed-off-by: David Hildenbrand <da...@redhat.com>
---
mm/memory_hotplug.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 5eb4a4c7c21b..328878b6799d 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -854,6 +854,7 @@ 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);
--
2.20.1
