From: Vivek Goyal <vgoyal@redhat.com>
Date: Mon, 23 May 2011 08:02:19 +0000 (+0200)
Subject: cfq-iosched: Fix a memory leak of per cpu stats for root group
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=2abae55f5a41d29f21b5b259c33d218c950d5c90;p=linux-beck.git

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 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);
 }