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raid5: fix to detect failure of register_shrinker 

register_shrinker can fail after commit 1d3d4437ea ("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@huawei.com>
Signed-off-by: Shaohua Li <shli@fb.com>
This commit is contained in:
Chao Yu 2016-09-20 10:33:57 +08:00 committed by Shaohua Li
parent 90bcf13381
commit 6a0f53ff35
1 changed files with 6 additions and 1 deletions
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7
drivers/md/raid5.c
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@ -6670,7 +6670,12 @@ 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);