register_shrinker can fail after commit 1d3d4437eae1 ("vmscan: per-node
deferred work"), we should detect the failure of it, otherwise we may
fail to register shrinker after raid5 configuration was setup successfully.
Signed-off-by: Chao Yu <yuchao0@xxxxxxxxxx>
---
drivers/md/raid5.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 766c3b7..b819a9a 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -6632,7 +6632,12 @@ static struct r5conf *setup_conf(struct mddev *mddev)
conf->shrinker.count_objects = raid5_cache_count;
conf->shrinker.batch = 128;
conf->shrinker.flags = 0;
- register_shrinker(&conf->shrinker);
+ if (register_shrinker(&conf->shrinker)) {
+ printk(KERN_ERR
+ "md/raid:%s: couldn't register shrinker.\n",
+ mdname(mddev));
+ goto abort;
+ }
sprintf(pers_name, "raid%d", mddev->new_level);
conf->thread = md_register_thread(raid5d, mddev, pers_name);
--
2.7.2
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