SINGLE_RX_URB
num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
(quirks == SINGLE_RX_URB ? 1 : 2);
.driver_info = SINGLE_RX_URB,
.driver_info = SINGLE_RX_URB, /* firmware bug */
.driver_info = SINGLE_RX_URB, /* firmware bug */
.driver_info = SINGLE_RX_URB,