diff --git a/block/genhd.c b/block/genhd.c
index c44527d..00da521 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -360,7 +360,9 @@
 
 static int __init genhd_device_init(void)
 {
-	class_register(&block_class);
+	int error = class_register(&block_class);
+	if (unlikely(error))
+		return error;
 	bdev_map = kobj_map_init(base_probe, &block_class_lock);
 	blk_dev_init();