usbvc_vc_header_t
kmem_free(usbvcp->usbvc_vc_header, sizeof (usbvc_vc_header_t));
(usbvc_vc_header_t *)kmem_zalloc(
sizeof (usbvc_vc_header_t), KM_SLEEP);
usbvc_vc_header_t *usbvc_vc_header;