tree 87ded2ff291b63259ac3df846a09d8348174f636
parent 53951bd57dfe2da58f86cdf276719082d80d8485
author Johannes Weiner <hannes@cmpxchg.org> 1241129288 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1241303769 -0700

mm: fix pageref leak in do_swap_page()

By the time the memory cgroup code is notified about a swapin we
already hold a reference on the fault page.

If the cgroup callback fails make sure to unlock AND release the page
reference which was taken by lookup_swap_cach(), or we leak the reference.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Balbir Singh <balbir@linux.vnet.ibm.com>
Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>