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>

diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index d646b279c8bbe88faee7a7369f1c26bbe4fc2ab8..0316f6eece0383437cb63364d85b82e259c5eb8c 100644 (file)
--- 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);
 }