struct device dev;
        struct device_driver drv;
        struct bus_type bus;
-       struct class *class;
        struct list_head comp_list;
 } mc;
 
                pr_info("Cannot register most bus\n");
                return err;
        }
-       mc.class = class_create(THIS_MODULE, "most");
-       if (IS_ERR(mc.class)) {
-               pr_info("No udev support.\n");
-               err = PTR_ERR(mc.class);
-               goto exit_bus;
-       }
-
        err = driver_register(&mc.drv);
        if (err) {
                pr_info("Cannot register core driver\n");
-               goto exit_class;
+               goto exit_bus;
        }
        mc.dev.init_name = "most_bus";
        mc.dev.release = release_most_sub;
 
 exit_driver:
        driver_unregister(&mc.drv);
-exit_class:
-       class_destroy(mc.class);
 exit_bus:
        bus_unregister(&mc.bus);
        return err;
        pr_info("exit core module\n");
        device_unregister(&mc.dev);
        driver_unregister(&mc.drv);
-       class_destroy(mc.class);
        bus_unregister(&mc.bus);
        ida_destroy(&mdev_id);
 }