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-rw-r--r--mm/memcontrol.c23
1 files changed, 15 insertions, 8 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index b66512771167..7be9b35d7ffb 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -994,14 +994,15 @@ static int mem_cgroup_move_account(struct page_cgroup *pc,
if (pc->mem_cgroup != from)
goto out;
- css_put(&from->css);
res_counter_uncharge(&from->res, PAGE_SIZE);
mem_cgroup_charge_statistics(from, pc, false);
if (do_swap_account)
res_counter_uncharge(&from->memsw, PAGE_SIZE);
+ css_put(&from->css);
+
+ css_get(&to->css);
pc->mem_cgroup = to;
mem_cgroup_charge_statistics(to, pc, true);
- css_get(&to->css);
ret = 0;
out:
unlock_page_cgroup(pc);
@@ -1034,8 +1035,10 @@ static int mem_cgroup_move_parent(struct page_cgroup *pc,
if (ret || !parent)
return ret;
- if (!get_page_unless_zero(page))
- return -EBUSY;
+ if (!get_page_unless_zero(page)) {
+ ret = -EBUSY;
+ goto uncharge;
+ }
ret = isolate_lru_page(page);
@@ -1044,19 +1047,23 @@ static int mem_cgroup_move_parent(struct page_cgroup *pc,
ret = mem_cgroup_move_account(pc, child, parent);
- /* drop extra refcnt by try_charge() (move_account increment one) */
- css_put(&parent->css);
putback_lru_page(page);
if (!ret) {
put_page(page);
+ /* drop extra refcnt by try_charge() */
+ css_put(&parent->css);
return 0;
}
- /* uncharge if move fails */
+
cancel:
+ put_page(page);
+uncharge:
+ /* drop extra refcnt by try_charge() */
+ css_put(&parent->css);
+ /* uncharge if move fails */
res_counter_uncharge(&parent->res, PAGE_SIZE);
if (do_swap_account)
res_counter_uncharge(&parent->memsw, PAGE_SIZE);
- put_page(page);
return ret;
}