146 	struct tty_struct	*tty;  member
178 static ssize_t n_hdlc_tty_read(struct tty_struct *tty, struct file *file,
180 static ssize_t n_hdlc_tty_write(struct tty_struct *tty, struct file *file,
182 static int n_hdlc_tty_ioctl(struct tty_struct *tty, struct file *file,
184 static unsigned int n_hdlc_tty_poll(struct tty_struct *tty, struct file *filp,
186 static int n_hdlc_tty_open(struct tty_struct *tty);
187 static void n_hdlc_tty_close(struct tty_struct *tty);
188 static void n_hdlc_tty_receive(struct tty_struct *tty, const __u8 *cp,
190 static void n_hdlc_tty_wakeup(struct tty_struct *tty);
194 #define tty2n_hdlc(tty)	((struct n_hdlc *) ((tty)->disc_data))  argument
195 #define n_hdlc2tty(n_hdlc)	((n_hdlc)->tty)
197 static void flush_rx_queue(struct tty_struct *tty)  in flush_rx_queue()  argument
199 	struct n_hdlc *n_hdlc = tty2n_hdlc(tty);  in flush_rx_queue()
206 static void flush_tx_queue(struct tty_struct *tty)  in flush_tx_queue()  argument
208 	struct n_hdlc *n_hdlc = tty2n_hdlc(tty);  in flush_tx_queue()
236 	struct tty_struct *tty = n_hdlc2tty (n_hdlc);  in n_hdlc_release()  local
243 	wake_up_interruptible (&tty->read_wait);  in n_hdlc_release()
244 	wake_up_interruptible (&tty->write_wait);  in n_hdlc_release()
246 	if (tty->disc_data == n_hdlc)  in n_hdlc_release()
247 		tty->disc_data = NULL;	/* Break the tty->n_hdlc link */  in n_hdlc_release()
289 static void n_hdlc_tty_close(struct tty_struct *tty)  in n_hdlc_tty_close()  argument
291 	struct n_hdlc *n_hdlc = tty2n_hdlc (tty);  in n_hdlc_tty_close()
302 		clear_bit(TTY_NO_WRITE_SPLIT,&tty->flags);  in n_hdlc_tty_close()
304 		tty->disc_data = NULL;  in n_hdlc_tty_close()
305 		if (tty == n_hdlc->backup_tty)  in n_hdlc_tty_close()
307 		if (tty != n_hdlc->tty)  in n_hdlc_tty_close()
310 			n_hdlc->tty = n_hdlc->backup_tty;  in n_hdlc_tty_close()
327 static int n_hdlc_tty_open (struct tty_struct *tty)  in n_hdlc_tty_open()  argument
329 	struct n_hdlc *n_hdlc = tty2n_hdlc (tty);  in n_hdlc_tty_open()
334 		tty->name);  in n_hdlc_tty_open()
348 	tty->disc_data = n_hdlc;  in n_hdlc_tty_open()
349 	n_hdlc->tty    = tty;  in n_hdlc_tty_open()
350 	tty->receive_room = 65536;  in n_hdlc_tty_open()
354 	set_bit(TTY_NO_WRITE_SPLIT,&tty->flags);  in n_hdlc_tty_open()
358 	tty_driver_flush_buffer(tty);  in n_hdlc_tty_open()
376 static void n_hdlc_send_frames(struct n_hdlc *n_hdlc, struct tty_struct *tty)  in n_hdlc_send_frames()  argument
403 		set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);  in n_hdlc_send_frames()
404 		actual = tty->ops->write(tty, tbuf->buf, tbuf->count);  in n_hdlc_send_frames()
425 			wake_up_interruptible(&tty->write_wait);  in n_hdlc_send_frames()
444 		clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);  in n_hdlc_send_frames()
465 static void n_hdlc_tty_wakeup(struct tty_struct *tty)  in n_hdlc_tty_wakeup()  argument
467 	struct n_hdlc *n_hdlc = tty2n_hdlc(tty);  in n_hdlc_tty_wakeup()
475 	if (tty != n_hdlc->tty) {  in n_hdlc_tty_wakeup()
476 		clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);  in n_hdlc_tty_wakeup()
480 	n_hdlc_send_frames (n_hdlc, tty);  in n_hdlc_tty_wakeup()
494 static void n_hdlc_tty_receive(struct tty_struct *tty, const __u8 *data,  in n_hdlc_tty_receive()  argument
497 	register struct n_hdlc *n_hdlc = tty2n_hdlc (tty);  in n_hdlc_tty_receive()
505 	if (!n_hdlc || tty != n_hdlc->tty)  in n_hdlc_tty_receive()
546 	wake_up_interruptible (&tty->read_wait);  in n_hdlc_tty_receive()
547 	if (n_hdlc->tty->fasync != NULL)  in n_hdlc_tty_receive()
548 		kill_fasync (&n_hdlc->tty->fasync, SIGIO, POLL_IN);  in n_hdlc_tty_receive()
561 static ssize_t n_hdlc_tty_read(struct tty_struct *tty, struct file *file,  in n_hdlc_tty_read()  argument
564 	struct n_hdlc *n_hdlc = tty2n_hdlc(tty);  in n_hdlc_tty_read()
583 	add_wait_queue(&tty->read_wait, &wait);  in n_hdlc_tty_read()
586 		if (test_bit(TTY_OTHER_CLOSED, &tty->flags)) {  in n_hdlc_tty_read()
629 	remove_wait_queue(&tty->read_wait, &wait);  in n_hdlc_tty_read()
645 static ssize_t n_hdlc_tty_write(struct tty_struct *tty, struct file *file,  in n_hdlc_tty_write()  argument
648 	struct n_hdlc *n_hdlc = tty2n_hdlc (tty);  in n_hdlc_tty_write()
674 	add_wait_queue(&tty->write_wait, &wait);  in n_hdlc_tty_write()
689 		n_hdlc = tty2n_hdlc (tty);  in n_hdlc_tty_write()
691 		    tty != n_hdlc->tty) {  in n_hdlc_tty_write()
704 	remove_wait_queue(&tty->write_wait, &wait);  in n_hdlc_tty_write()
713 		n_hdlc_send_frames(n_hdlc,tty);  in n_hdlc_tty_write()
729 static int n_hdlc_tty_ioctl(struct tty_struct *tty, struct file *file,  in n_hdlc_tty_ioctl()  argument
732 	struct n_hdlc *n_hdlc = tty2n_hdlc (tty);  in n_hdlc_tty_ioctl()
763 		count = tty_chars_in_buffer(tty);  in n_hdlc_tty_ioctl()
778 			flush_tx_queue(tty);  in n_hdlc_tty_ioctl()
783 		error = n_tty_ioctl_helper(tty, file, cmd, arg);  in n_hdlc_tty_ioctl()
800 static unsigned int n_hdlc_tty_poll(struct tty_struct *tty, struct file *filp,  in n_hdlc_tty_poll()  argument
803 	struct n_hdlc *n_hdlc = tty2n_hdlc (tty);  in n_hdlc_tty_poll()
809 	if (n_hdlc && n_hdlc->magic == HDLC_MAGIC && tty == n_hdlc->tty) {  in n_hdlc_tty_poll()
813 		poll_wait(filp, &tty->read_wait, wait);  in n_hdlc_tty_poll()
814 		poll_wait(filp, &tty->write_wait, wait);  in n_hdlc_tty_poll()
819 		if (test_bit(TTY_OTHER_CLOSED, &tty->flags))  in n_hdlc_tty_poll()
823 		if (!tty_is_writelocked(tty) &&  in n_hdlc_tty_poll()