Symbol: tty_is_writelocked
drivers/tty/n_gsm.c
3822
if (!tty_is_writelocked(tty) && tty_write_room(tty) > 0)
drivers/tty/n_hdlc.c
651
if (!tty_is_writelocked(tty) &&
drivers/tty/n_tty.c
2453
if (tty->ops->write && !tty_is_writelocked(tty) &&