From 30c8946566f32493f7f1143437319c42c8a542e9 Mon Sep 17 00:00:00 2001
From: Shaohua Li <shli@fb.com>
Date: Wed, 21 Sep 2016 09:07:13 -0700
Subject: raid5: handle register_shrinker failure

register_shrinker() now can fail. When it happens, shrinker.nr_deferred is
null. We use it to determine if unregister_shrinker is required.

Signed-off-by: Shaohua Li <shli@fb.com>

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 08274b4..f94472d 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -6372,7 +6372,7 @@ static void free_conf(struct r5conf *conf)
 {
 	if (conf->log)
 		r5l_exit_log(conf->log);
-	if (conf->shrinker.seeks)
+	if (conf->shrinker.nr_deferred)
 		unregister_shrinker(&conf->shrinker);
 
 	free_thread_groups(conf);
-- 
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