Function at include/linux/usb/serial.h, line 187 References: drivers/staging/quatech_usb2/quatech_usb2.c, line 1381 drivers/usb/serial/digi_acceleport.c, line 1319 drivers/usb/serial/ftdi_sio.c, line 1640 drivers/usb/serial/io_edgeport.c, line 2944 drivers/usb/serial/io_edgeport.c, line 3020 drivers/usb/serial/io_ti.c, line 2614 drivers/usb/serial/io_ti.c, line 2654 drivers/usb/serial/ipw.c, line 233 drivers/usb/serial/ipw.c, line 242 drivers/usb/serial/keyspan.c, line 2547 drivers/usb/serial/mos7720.c, line 707 drivers/usb/serial/mos7720.c, line 2145 drivers/usb/serial/opticon.c, line 544 drivers/usb/serial/qcserial.c, line 226 drivers/usb/serial/qcserial.c, line 238 drivers/usb/serial/symbolserial.c, line 255 drivers/usb/serial/ti_usb_3410_5052.c, line 406 drivers/usb/serial/ti_usb_3410_5052.c, line 474 drivers/usb/serial/visor.c, line 420 drivers/usb/serial/visor.c, line 513 include/linux/usb/serial.h, line 187