mousevsc_prt_msg
struct mousevsc_prt_msg protocol_req;
struct mousevsc_prt_msg protocol_resp;
struct mousevsc_prt_msg ack;
memset(&ack, 0, sizeof(struct mousevsc_prt_msg));
if (WARN_ON(len > sizeof(struct mousevsc_prt_msg)))
struct mousevsc_prt_msg *request;
struct mousevsc_prt_msg *response;
memset(request, 0, sizeof(struct mousevsc_prt_msg));