From e5112201c1285841f8b565ece5d6ae7e0d7947a2 Mon Sep 17 00:00:00 2001
From: Slava Pestov <sp@daterainc.com>
Date: Tue, 29 Apr 2014 15:39:27 -0700
Subject: bcache: fix lockdep warnings on shutdown


diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index 1ea9fa2..09573c2 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -1214,7 +1214,9 @@ void bch_flash_dev_release(struct kobject *kobj)
 static void flash_dev_free(struct closure *cl)
 {
 	struct bcache_device *d = container_of(cl, struct bcache_device, cl);
+	mutex_lock(&bch_register_lock);
 	bcache_device_free(d);
+	mutex_unlock(&bch_register_lock);
 	kobject_put(&d->kobj);
 }
 
@@ -1222,7 +1224,9 @@ static void flash_dev_flush(struct closure *cl)
 {
 	struct bcache_device *d = container_of(cl, struct bcache_device, cl);
 
+	mutex_lock(&bch_register_lock);
 	bcache_device_unlink(d);
+	mutex_unlock(&bch_register_lock);
 	kobject_del(&d->kobj);
 	continue_at(cl, flash_dev_free, system_wq);
 }
-- 
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