MAX_TX_URBS       225 drivers/net/can/usb/ems_usb.c #define MAX_TX_URBS 10
MAX_TX_URBS        88 drivers/net/can/usb/esd_usb2.c #define MAX_TX_URBS		16 /* must be power of 2 */
MAX_TX_URBS        28 drivers/net/can/usb/usb_8dev.c #define MAX_TX_URBS			20