[PATCH] Driver Core: fix minor class reference counting issue on the error path

Signed-off-by: Thomas Koeller <thomas.koeller@baslerweb.com>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

drivers/base/class.c

@@ -349,14 +349,19 @@ void class_device_initialize(struct class_device *class_dev)
 
 int class_device_add(struct class_device *class_dev)
 {
-	struct class * parent;
+	struct class * parent = NULL;
 	struct class_interface * class_intf;
 	int error;
 
 	class_dev = class_device_get(class_dev);
-	if (!class_dev || !strlen(class_dev->class_id))
+	if (!class_dev)
 		return -EINVAL;
 
+	if (!strlen(class_dev->class_id)) {
+		error = -EINVAL;
+		goto register_done;
+	}
+
 	parent = class_get(class_dev->class);
 
 	pr_debug("CLASS: registering class device: ID = '%s'\n",