diff --git a/[refs] b/[refs]
index 7824da2b4141..19672a0a9380 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 437f2f91d6597c67662f847d9ed4c99cb3c440cd
+refs/heads/master: 69fc208be5b7eb18d22d1eca185b201400fd5ffc
diff --git a/trunk/mm/backing-dev.c b/trunk/mm/backing-dev.c
index 2a56124dbc28..801c08b046e6 100644
--- a/trunk/mm/backing-dev.c
+++ b/trunk/mm/backing-dev.c
@@ -176,7 +176,7 @@ int bdi_register(struct backing_dev_info *bdi, struct device *parent,
 	int ret = 0;
 	struct device *dev;
 
-	if (WARN_ON(bdi->dev))
+	if (bdi->dev)	/* The driver needs to use separate queues per device */
 		goto exit;
 
 	va_start(args, fmt);