mpt3_addnl_diag_query
struct mpt3_addnl_diag_query karg;
if (copy_to_user(arg, &karg, sizeof(struct mpt3_addnl_diag_query))) {
if (_IOC_SIZE(cmd) == sizeof(struct mpt3_addnl_diag_query))
struct mpt3_addnl_diag_query)