cfq-iosched: Fix a memory leak of per cpu stats for root group

We allocated per cpu stats struct for root group but did not free it.
Fix it.

Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index d646b279c8bb..0316f6eece03 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -3940,6 +3940,11 @@ static void cfq_exit_queue(struct elevator_queue *e)
          */
         if (wait)
                 synchronize_rcu();
+
+#ifdef CONFIG_CFQ_GROUP_IOSCHED
+        /* Free up per cpu stats for root group */
+        free_percpu(cfqd->root_group.blkg.stats_cpu);
+#endif
         kfree(cfqd);
 }