Function at include/linux/usb/serial.h, line 180 References: drivers/usb/serial/cp210x.c, line 1503 drivers/usb/serial/digi_acceleport.c, line 1272 drivers/usb/serial/f81534.c, line 855 drivers/usb/serial/ftdi_sio.c, line 1789 drivers/usb/serial/io_edgeport.c, line 2850 drivers/usb/serial/io_ti.c, line 2558 drivers/usb/serial/keyspan.c, line 2826 drivers/usb/serial/mos7720.c, line 716 drivers/usb/serial/mos7720.c, line 1959 drivers/usb/serial/mos7840.c, line 2079 drivers/usb/serial/mxuport.c, line 1117 drivers/usb/serial/option.c, line 1998 drivers/usb/serial/option.c, line 2023 drivers/usb/serial/pl2303.c, line 221 drivers/usb/serial/pl2303.c, line 312 drivers/usb/serial/qcserial.c, line 414 drivers/usb/serial/qcserial.c, line 434 drivers/usb/serial/qcserial.c, line 443 drivers/usb/serial/quatech2.c, line 714 drivers/usb/serial/sierra.c, line 857 drivers/usb/serial/spcp8x5.c, line 148 drivers/usb/serial/ti_usb_3410_5052.c, line 534 drivers/usb/serial/ti_usb_3410_5052.c, line 591 drivers/usb/serial/visor.c, line 387 drivers/usb/serial/visor.c, line 474 include/linux/usb/serial.h, line 180