diff --git a/hw/usb/bus.c b/hw/usb/bus.c
index 6b0d9f9e4d..da85b8b005 100644
--- a/hw/usb/bus.c
+++ b/hw/usb/bus.c
@@ -296,14 +296,13 @@ typedef struct LegacyUSBFactory
 {
     const char *name;
     const char *usbdevice_name;
-    USBDevice *(*usbdevice_init)(USBBus *bus, const char *params);
+    USBDevice *(*usbdevice_init)(const char *params);
 } LegacyUSBFactory;
 
 static GSList *legacy_usb_factory;
 
 void usb_legacy_register(const char *typename, const char *usbdevice_name,
-                         USBDevice *(*usbdevice_init)(USBBus *bus,
-                                                      const char *params))
+                         USBDevice *(*usbdevice_init)(const char *params))
 {
     if (usbdevice_name) {
         LegacyUSBFactory *f = g_malloc0(sizeof(*f));
@@ -710,19 +709,19 @@ USBDevice *usbdevice_create(const char *cmdline)
     }
 
     if (f->usbdevice_init) {
-        dev = f->usbdevice_init(bus, params);
+        dev = f->usbdevice_init(params);
     } else {
         if (*params) {
             error_report("usbdevice %s accepts no params", driver);
             return NULL;
         }
-        dev = usb_create(bus, f->name);
+        dev = usb_new(f->name);
     }
     if (!dev) {
         error_report("Failed to create USB device '%s'", f->name);
         return NULL;
     }
-    object_property_set_bool(OBJECT(dev), true, "realized", &err);
+    usb_realize_and_unref(dev, bus, &err);
     if (err) {
         error_reportf_err(err, "Failed to initialize USB device '%s': ",
                           f->name);
diff --git a/hw/usb/dev-serial.c b/hw/usb/dev-serial.c
index d2c03681b7..7e50e3ba47 100644
--- a/hw/usb/dev-serial.c
+++ b/hw/usb/dev-serial.c
@@ -542,7 +542,7 @@ static void usb_serial_realize(USBDevice *dev, Error **errp)
     s->intr = usb_ep_get(dev, USB_TOKEN_IN, 1);
 }
 
-static USBDevice *usb_braille_init(USBBus *bus, const char *unused)
+static USBDevice *usb_braille_init(const char *unused)
 {
     USBDevice *dev;
     Chardev *cdrv;
@@ -551,7 +551,7 @@ static USBDevice *usb_braille_init(USBBus *bus, const char *unused)
     if (!cdrv)
         return NULL;
 
-    dev = usb_create(bus, "usb-braille");
+    dev = usb_new("usb-braille");
     qdev_prop_set_chr(&dev->qdev, "chardev", cdrv);
     return dev;
 }
diff --git a/include/hw/usb.h b/include/hw/usb.h
index 1cc0ba0fed..dce16c792b 100644
--- a/include/hw/usb.h
+++ b/include/hw/usb.h
@@ -502,8 +502,7 @@ void usb_bus_new(USBBus *bus, size_t bus_size,
 void usb_bus_release(USBBus *bus);
 USBBus *usb_bus_find(int busnr);
 void usb_legacy_register(const char *typename, const char *usbdevice_name,
-                         USBDevice *(*usbdevice_init)(USBBus *bus,
-                                                      const char *params));
+                         USBDevice *(*usbdevice_init)(const char *params));
 USBDevice *usb_new(const char *name);
 bool usb_realize_and_unref(USBDevice *dev, USBBus *bus, Error **errp);
 USBDevice *usb_create(USBBus *bus, const char *name);