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Subject[PATCH] mm, memory_hotplug: __offline_pages fix wrong locking
Date
From: Michal Hocko <mhocko@suse.com>

Jan has noticed that we do double unlock on some failure paths when
offlining a page range. This is indeed the case when test_pages_in_a_zone
respp. start_isolate_page_range fail. This was an omission when forward
porting the debugging patch from an older kernel.

Fix the issue by dropping mem_hotplug_done from the failure condition
and keeping the single unlock in the catch all failure path.

Reported-by: Jan Kara <jack@suse.cz>
Fixes: 7960509329c2 ("mm, memory_hotplug: print reason for the offlining failure")
Signed-off-by: Michal Hocko <mhocko@suse.com>
---
mm/memory_hotplug.c | 2 --
1 file changed, 2 deletions(-)

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index b9a667d36c55..faeeaccc5fae 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1576,7 +1576,6 @@ static int __ref __offline_pages(unsigned long start_pfn,
we assume this for now. .*/
if (!test_pages_in_a_zone(start_pfn, end_pfn, &valid_start,
&valid_end)) {
- mem_hotplug_done();
ret = -EINVAL;
reason = "multizone range";
goto failed_removal;
@@ -1591,7 +1590,6 @@ static int __ref __offline_pages(unsigned long start_pfn,
MIGRATE_MOVABLE,
SKIP_HWPOISON | REPORT_FAILURE);
if (ret) {
- mem_hotplug_done();
reason = "failure to isolate range";
goto failed_removal;
}
--
2.20.1
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