[PATCH 1/3] cfq-iosched: Fix a memory leak of per cpu stats for root group

[Vivek Goyal]

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

Signed-off-by: Vivek Goyal <vgoyal@xxxxxxxxxx>
---
 block/cfq-iosched.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index d646b27..0316f6e 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);
 }
 
-- 
1.7.4.4

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