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>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 08274b4b4009..f94472dd0323 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);