TWS_IO_TIMEOUT
callout_reset(&req->thandle, (TWS_IO_TIMEOUT * hz), tws_timeout, req);
callout_reset(&req->thandle, (TWS_IO_TIMEOUT * hz), tws_timeout, req);
"tws_sleep", TWS_IO_TIMEOUT*hz);
error = lksleep(req, &sc->gen_lock, 0, "tws_passthru", TWS_IO_TIMEOUT*hz);