Comment # 14 on bug 994503 from Bogdano Arendartchuk

Interesting part:

drivers/usb/class/cdc-acm.c:479 [cdc_acm]acm_tty_install =pmf "%s\012"
drivers/usb/class/cdc-acm.c:502 [cdc_acm]acm_tty_open =pmf "%s\012"
drivers/usb/class/cdc-acm.c:653 [cdc_acm]acm_tty_close =pmf "%s\012"
drivers/usb/class/cdc-acm.c:639 [cdc_acm]acm_tty_cleanup =pmf "%s\012"
drivers/usb/class/cdc-acm.c:998 [cdc_acm]acm_tty_set_termios =pmf "%s - set
line: %d %d %d %d\012"
drivers/usb/class/cdc-acm.c:646 [cdc_acm]acm_tty_hangup =pmf "%s\012"
drivers/usb/class/cdc-acm.c:768 [cdc_acm]acm_tty_break_ctl =pmf "%s - send
break failed\012"
drivers/usb/class/cdc-acm.c:138 [cdc_acm]acm_ctrl_msg =pmf "%s - rq 0x%02x, val
%#x, len %#x, result %d\012"
drivers/usb/class/cdc-acm.c:607 [cdc_acm]acm_port_shutdown =pmf "%s\012"
drivers/usb/class/cdc-acm.c:532 [cdc_acm]acm_port_activate =pmf "%s\012"
drivers/usb/class/cdc-acm.c:592 [cdc_acm]acm_port_destruct =pmf "%s\012"
drivers/usb/class/cdc-acm.c:422 [cdc_acm]acm_read_bulk_callback =pmf "%s -
non-zero urb status: %d\012"
drivers/usb/class/cdc-acm.c:416 [cdc_acm]acm_read_bulk_callback =pmf "%s -
disconnected\012"
drivers/usb/class/cdc-acm.c:348 [cdc_acm]acm_ctrl_irq =pmf "%s - unknown
notification %d received: index %d len %d data0 %d data1 %d\012"
drivers/usb/class/cdc-acm.c:312 [cdc_acm]acm_ctrl_irq =pmf "%s - calling
hangup\012"
drivers/usb/class/cdc-acm.c:304 [cdc_acm]acm_ctrl_irq =pmf "%s - network
connection: %d\012"
drivers/usb/class/cdc-acm.c:294 [cdc_acm]acm_ctrl_irq =pmf "%s - nonzero urb
status received: %d\012"
drivers/usb/class/cdc-acm.c:289 [cdc_acm]acm_ctrl_irq =pmf "%s - urb shutting
down with status: %d\012"
drivers/usb/class/cdc-acm.c:1296 [cdc_acm]acm_probe =pmf "interfaces are
valid\012"
drivers/usb/class/cdc-acm.c:1290 [cdc_acm]acm_probe =pmf "The data interface
has switched endpoints\012"
drivers/usb/class/cdc-acm.c:1268 [cdc_acm]acm_probe =pmf "The data interface
isn't available\012"
drivers/usb/class/cdc-acm.c:1253 [cdc_acm]acm_probe =pmf "Your device has
switched interfaces.\012"
drivers/usb/class/cdc-acm.c:1201 [cdc_acm]acm_probe =pmf "Separate call control
interface. That is not fully supported.\012"
drivers/usb/class/cdc-acm.c:1195 [cdc_acm]acm_probe =pmf "no interfaces\012"
drivers/usb/class/cdc-acm.c:1182 [cdc_acm]acm_probe =pmf "No union descriptor,
giving up\012"
drivers/usb/class/cdc-acm.c:1171 [cdc_acm]acm_probe =pmf "No union descriptor,
using call management descriptor\012"
drivers/usb/class/cdc-acm.c:1161 [cdc_acm]acm_probe =pmf "Ignoring descriptor:
type %02x, length %d\012"
drivers/usb/class/cdc-acm.c:1116 [cdc_acm]acm_probe =pmf "Seeking extra
descriptors on endpoint\012"
drivers/usb/class/cdc-acm.c:1529 [cdc_acm]acm_disconnect =pmf "%s\012"
drivers/usb/class/cdc-acm.c:1511 [cdc_acm]stop_data_traffic =pmf "%s\012"