1 files changed, 3 insertions, 0 deletions

diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index f2e574dbc30..2a56124dbc2 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -176,6 +176,9 @@ int bdi_register(struct backing_dev_info *bdi, struct device *parent,
         int ret = 0;
         struct device *dev;
 
+        if (WARN_ON(bdi->dev))
+                goto exit;
+
         va_start(args, fmt);
         dev = device_create_vargs(bdi_class, parent, MKDEV(0, 0), bdi, fmt, args);
         va_end(args);