159 static void flush_rx_queue(struct tty_struct *tty)  in flush_rx_queue()  argument
161 	struct n_hdlc *n_hdlc = tty->disc_data;  in flush_rx_queue()
168 static void flush_tx_queue(struct tty_struct *tty)  in flush_tx_queue()  argument
170 	struct n_hdlc *n_hdlc = tty->disc_data;  in flush_tx_queue()
194 static void n_hdlc_tty_close(struct tty_struct *tty)  in n_hdlc_tty_close()  argument
196 	struct n_hdlc *n_hdlc = tty->disc_data;  in n_hdlc_tty_close()
199 	clear_bit(TTY_NO_WRITE_SPLIT, &tty->flags);  in n_hdlc_tty_close()
201 	tty->disc_data = NULL;  in n_hdlc_tty_close()
204 	wake_up_interruptible(&tty->read_wait);  in n_hdlc_tty_close()
205 	wake_up_interruptible(&tty->write_wait);  in n_hdlc_tty_close()
222 static int n_hdlc_tty_open(struct tty_struct *tty)  in n_hdlc_tty_open()  argument
224 	struct n_hdlc *n_hdlc = tty->disc_data;  in n_hdlc_tty_open()
226 	pr_debug("%s() called (device=%s)\n", __func__, tty->name);  in n_hdlc_tty_open()
241 	n_hdlc->tty_for_write_work = tty;  in n_hdlc_tty_open()
242 	tty->disc_data = n_hdlc;  in n_hdlc_tty_open()
243 	tty->receive_room = 65536;  in n_hdlc_tty_open()
246 	set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);  in n_hdlc_tty_open()
249 	tty_driver_flush_buffer(tty);  in n_hdlc_tty_open()
264 static void n_hdlc_send_frames(struct n_hdlc *n_hdlc, struct tty_struct *tty)  in n_hdlc_send_frames()  argument
287 		set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);  in n_hdlc_send_frames()
288 		actual = tty->ops->write(tty, tbuf->buf, tbuf->count);  in n_hdlc_send_frames()
307 			wake_up_interruptible(&tty->write_wait);  in n_hdlc_send_frames()
324 		clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);  in n_hdlc_send_frames()
344 	struct tty_struct *tty = n_hdlc->tty_for_write_work;  in n_hdlc_tty_write_work()  local
346 	n_hdlc_send_frames(n_hdlc, tty);  in n_hdlc_tty_write_work()
355 static void n_hdlc_tty_wakeup(struct tty_struct *tty)  in n_hdlc_tty_wakeup()  argument
357 	struct n_hdlc *n_hdlc = tty->disc_data;  in n_hdlc_tty_wakeup()
372 static void n_hdlc_tty_receive(struct tty_struct *tty, const u8 *data,  in n_hdlc_tty_receive()  argument
375 	register struct n_hdlc *n_hdlc = tty->disc_data;  in n_hdlc_tty_receive()
410 	wake_up_interruptible(&tty->read_wait);  in n_hdlc_tty_receive()
411 	if (tty->fasync != NULL)  in n_hdlc_tty_receive()
412 		kill_fasync(&tty->fasync, SIGIO, POLL_IN);  in n_hdlc_tty_receive()
427 static ssize_t n_hdlc_tty_read(struct tty_struct *tty, struct file *file,  in n_hdlc_tty_read()  argument
431 	struct n_hdlc *n_hdlc = tty->disc_data;  in n_hdlc_tty_read()
441 	add_wait_queue(&tty->read_wait, &wait);  in n_hdlc_tty_read()
444 		if (test_bit(TTY_OTHER_CLOSED, &tty->flags)) {  in n_hdlc_tty_read()
458 		if (tty_io_nonblock(tty, file)) {  in n_hdlc_tty_read()
471 	remove_wait_queue(&tty->read_wait, &wait);  in n_hdlc_tty_read()
520 static ssize_t n_hdlc_tty_write(struct tty_struct *tty, struct file *file,  in n_hdlc_tty_write()  argument
523 	struct n_hdlc *n_hdlc = tty->disc_data;  in n_hdlc_tty_write()
537 	add_wait_queue(&tty->write_wait, &wait);  in n_hdlc_tty_write()
546 		if (tty_io_nonblock(tty, file)) {  in n_hdlc_tty_write()
559 	remove_wait_queue(&tty->write_wait, &wait);  in n_hdlc_tty_write()
568 		n_hdlc_send_frames(n_hdlc, tty);  in n_hdlc_tty_write()
583 static int n_hdlc_tty_ioctl(struct tty_struct *tty, unsigned int cmd,  in n_hdlc_tty_ioctl()  argument
586 	struct n_hdlc *n_hdlc = tty->disc_data;  in n_hdlc_tty_ioctl()
611 		count = tty_chars_in_buffer(tty);  in n_hdlc_tty_ioctl()
626 			flush_tx_queue(tty);  in n_hdlc_tty_ioctl()
631 		error = n_tty_ioctl_helper(tty, cmd, arg);  in n_hdlc_tty_ioctl()
648 static __poll_t n_hdlc_tty_poll(struct tty_struct *tty, struct file *filp,  in n_hdlc_tty_poll()  argument
651 	struct n_hdlc *n_hdlc = tty->disc_data;  in n_hdlc_tty_poll()
658 	poll_wait(filp, &tty->read_wait, wait);  in n_hdlc_tty_poll()
659 	poll_wait(filp, &tty->write_wait, wait);  in n_hdlc_tty_poll()
664 	if (test_bit(TTY_OTHER_CLOSED, &tty->flags))  in n_hdlc_tty_poll()
668 	if (!tty_is_writelocked(tty) &&  in n_hdlc_tty_poll()