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 @@
{
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);