160 	struct tty_struct *tty;		/* ptr to TTY structure	*/  member
205 static unsigned int n_hdlc_tty_poll (struct tty_struct *tty, struct file *filp,
209 static int n_hdlc_tty_room (struct tty_struct *tty);
210 static void n_hdlc_tty_receive (struct tty_struct *tty,
212 static void n_hdlc_tty_wakeup (struct tty_struct *tty);
216 #define tty2n_hdlc(tty)	((struct n_hdlc *) ((tty)->disc_data))  argument
217 #define n_hdlc2tty(n_hdlc)	((n_hdlc)->tty)
229 	struct tty_struct *tty = n_hdlc2tty (n_hdlc);  in n_hdlc_release()  local
236 	wake_up_interruptible (&tty->read_wait);  in n_hdlc_release()
237 	wake_up_interruptible (&tty->write_wait);  in n_hdlc_release()
239 	if (tty != NULL && tty->disc_data == n_hdlc)  in n_hdlc_release()
240 		tty->disc_data = NULL;	/* Break the tty->n_hdlc link */  in n_hdlc_release()
282 static void n_hdlc_tty_close(struct tty_struct *tty)  in n_hdlc_tty_close()  argument
284 	struct n_hdlc *n_hdlc = tty2n_hdlc (tty);  in n_hdlc_tty_close()
295 		clear_bit(TTY_NO_WRITE_SPLIT,&tty->flags);  in n_hdlc_tty_close()
297 		tty->disc_data = NULL;  in n_hdlc_tty_close()
298 		if (tty == n_hdlc->backup_tty)  in n_hdlc_tty_close()
300 		if (tty != n_hdlc->tty)  in n_hdlc_tty_close()
303 			n_hdlc->tty = n_hdlc->backup_tty;  in n_hdlc_tty_close()
322 static int n_hdlc_tty_open (struct tty_struct *tty)  in n_hdlc_tty_open()  argument
324 	struct n_hdlc *n_hdlc = tty2n_hdlc (tty);  in n_hdlc_tty_open()
329 		MAJOR(tty->device), MINOR(tty->device));  in n_hdlc_tty_open()
343 	tty->disc_data = n_hdlc;  in n_hdlc_tty_open()
344 	n_hdlc->tty    = tty;  in n_hdlc_tty_open()
350 	set_bit(TTY_NO_WRITE_SPLIT,&tty->flags);  in n_hdlc_tty_open()
355 	tty_ldisc_flush(tty);	  in n_hdlc_tty_open()
357 	if (tty->driver.flush_buffer)  in n_hdlc_tty_open()
358 		tty->driver.flush_buffer (tty);  in n_hdlc_tty_open()
378 static void n_hdlc_send_frames (struct n_hdlc *n_hdlc, struct tty_struct *tty)  in n_hdlc_send_frames()  argument
412 		tty->flags |= (1 << TTY_DO_WRITE_WAKEUP);  in n_hdlc_send_frames()
413 		actual = tty->driver.write(tty, 0, tbuf->buf, tbuf->count);  in n_hdlc_send_frames()
432 			wake_up_interruptible(&tty->write_wait);  in n_hdlc_send_frames()
449 		tty->flags  &= ~(1 << TTY_DO_WRITE_WAKEUP);  in n_hdlc_send_frames()
473 static void n_hdlc_tty_wakeup (struct tty_struct *tty)  in n_hdlc_tty_wakeup()  argument
475 	struct n_hdlc *n_hdlc = tty2n_hdlc (tty);  in n_hdlc_tty_wakeup()
483 	if (tty != n_hdlc->tty) {  in n_hdlc_tty_wakeup()
484 		tty->flags &= ~(1 << TTY_DO_WRITE_WAKEUP);  in n_hdlc_tty_wakeup()
488 	n_hdlc_send_frames (n_hdlc, tty);  in n_hdlc_tty_wakeup()
501 static int n_hdlc_tty_room (struct tty_struct *tty)  in n_hdlc_tty_room()  argument
522 static void n_hdlc_tty_receive(struct tty_struct *tty,  in n_hdlc_tty_receive()  argument
525 	register struct n_hdlc *n_hdlc = tty2n_hdlc (tty);  in n_hdlc_tty_receive()
533 	if (n_hdlc == 0 || tty != n_hdlc->tty)  in n_hdlc_tty_receive()
574 	wake_up_interruptible (&tty->read_wait);  in n_hdlc_tty_receive()
575 	if (n_hdlc->tty->fasync != NULL)  in n_hdlc_tty_receive()
576 		kill_fasync (&n_hdlc->tty->fasync, SIGIO, POLL_IN);  in n_hdlc_tty_receive()
595 static rw_ret_t n_hdlc_tty_read (struct tty_struct *tty,  in n_hdlc_tty_read()  argument
598 	struct n_hdlc *n_hdlc = tty2n_hdlc(tty);  in n_hdlc_tty_read()
619 		if (test_bit(TTY_OTHER_CLOSED, &tty->flags))  in n_hdlc_tty_read()
622 		n_hdlc = tty2n_hdlc (tty);  in n_hdlc_tty_read()
624 			 tty != n_hdlc->tty)  in n_hdlc_tty_read()
635 		interruptible_sleep_on (&tty->read_wait);  in n_hdlc_tty_read()
675 static rw_ret_t n_hdlc_tty_write (struct tty_struct *tty, struct file *file,  in n_hdlc_tty_write()  argument
678 	struct n_hdlc *n_hdlc = tty2n_hdlc (tty);  in n_hdlc_tty_write()
704 	add_wait_queue(&tty->write_wait, &wait);  in n_hdlc_tty_write()
712 		n_hdlc = tty2n_hdlc (tty);  in n_hdlc_tty_write()
714 		    tty != n_hdlc->tty) {  in n_hdlc_tty_write()
727 	remove_wait_queue(&tty->write_wait, &wait);  in n_hdlc_tty_write()
739 			n_hdlc_send_frames(n_hdlc,tty);  in n_hdlc_tty_write()
760 static int n_hdlc_tty_ioctl (struct tty_struct *tty, struct file * file,  in n_hdlc_tty_ioctl()  argument
763 	struct n_hdlc *n_hdlc = tty2n_hdlc (tty);  in n_hdlc_tty_ioctl()
791 		count = tty->driver.chars_in_buffer ?  in n_hdlc_tty_ioctl()
792 				tty->driver.chars_in_buffer(tty) : 0;  in n_hdlc_tty_ioctl()
802 		error = n_tty_ioctl (tty, file, cmd, arg);  in n_hdlc_tty_ioctl()
825 static unsigned int n_hdlc_tty_poll (struct tty_struct *tty,  in n_hdlc_tty_poll()  argument
828 	struct n_hdlc *n_hdlc = tty2n_hdlc (tty);  in n_hdlc_tty_poll()
834 	if (n_hdlc && n_hdlc->magic == HDLC_MAGIC && tty == n_hdlc->tty) {  in n_hdlc_tty_poll()
838 		poll_wait(filp, &tty->read_wait, wait);  in n_hdlc_tty_poll()
839 		poll_wait(filp, &tty->write_wait, wait);  in n_hdlc_tty_poll()
844 		if (test_bit(TTY_OTHER_CLOSED, &tty->flags))  in n_hdlc_tty_poll()