tty_write_room
if (tty_write_room(tty) < 1 ||
room = tty_write_room(tty);
if (tty_write_room(gsm->tty) < len) {
space = tty_write_room(tty);
if (!tty_is_writelocked(tty) && tty_write_room(tty) > 0)
tty_write_room(tty) > 0)
if (do_output_char(c, tty, tty_write_room(tty)) < 0)
space = tty_write_room(tty);
old_space = space = tty_write_room(tty);
EXPORT_SYMBOL(tty_write_room);
unsigned int tty_write_room(struct tty_struct *tty);