diff --git a/port/ehci/usb_hc_ehci.c b/port/ehci/usb_hc_ehci.c
index a79cd606..bce45093 100644
--- a/port/ehci/usb_hc_ehci.c
+++ b/port/ehci/usb_hc_ehci.c
@@ -1160,21 +1160,18 @@ int usbh_submit_urb(struct usbh_urb *urb)
             if (qh == NULL) {
                 return -USB_ERR_NOMEM;
             }
-            urb->hcpriv = qh;
             break;
         case USB_ENDPOINT_TYPE_BULK:
             qh = ehci_bulk_urb_init(bus, urb, urb->transfer_buffer, urb->transfer_buffer_length);
             if (qh == NULL) {
                 return -USB_ERR_NOMEM;
             }
-            urb->hcpriv = qh;
             break;
         case USB_ENDPOINT_TYPE_INTERRUPT:
             qh = ehci_intr_urb_init(bus, urb, urb->transfer_buffer, urb->transfer_buffer_length);
             if (qh == NULL) {
                 return -USB_ERR_NOMEM;
             }
-            urb->hcpriv = qh;
             break;
         case USB_ENDPOINT_TYPE_ISOCHRONOUS:
 #ifdef CONFIG_USB_EHCI_ISO
diff --git a/port/musb/usb_dc_musb.c b/port/musb/usb_dc_musb.c
index ad61fabd..4dd3342c 100644
--- a/port/musb/usb_dc_musb.c
+++ b/port/musb/usb_dc_musb.c
@@ -113,7 +113,6 @@ struct musb_udc {
 } g_musb_udc;
 
 static volatile uint8_t usb_ep0_state = USB_EP0_STATE_SETUP;
-volatile bool zlp_flag = 0;
 
 /* get current active ep */
 static uint8_t musb_get_active_ep(void)
@@ -266,12 +265,6 @@ uint8_t usbd_get_port_speed(uint8_t busid)
     return speed;
 }
 
-uint8_t usbd_force_full_speed(const uint8_t port)
-{
-    HWREGB(USB_BASE + MUSB_POWER_OFFSET) &= ~USB_POWER_HSENAB;
-    return (HWREGB(USB_BASE + MUSB_POWER_OFFSET) & USB_POWER_HSENAB);
-}
-
 int usbd_ep_open(uint8_t busid, const struct usb_endpoint_descriptor *ep)
 {
     uint16_t used = 0;