171 	if (sl->tty == NULL) {  in sl_alloc_bufs()
260 	if (sl->tty == NULL)
407 	set_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags);
408 	actual = sl->tty->ops->write(sl->tty, sl->xbuff, count);
428 	if (!sl->tty || sl->magic != SLIP_MAGIC || !netif_running(sl->dev)) {
437 		clear_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags);
443 	actual = sl->tty->ops->write(sl->tty, sl->xhead, sl->xleft);
453 static void slip_write_wakeup(struct tty_struct *tty)  argument
455 	struct slip *sl = tty->disc_data;
480 			(tty_chars_in_buffer(sl->tty) || sl->xleft) ?
483 		clear_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags);
505 	if (sl->tty == NULL) {
533 	if (sl->tty)
535 		clear_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags);
550 	if (sl->tty == NULL)
684 static void slip_receive_buf(struct tty_struct *tty, const unsigned char *cp,  argument
687 	struct slip *sl = tty->disc_data;
726 		if (sl->tty || sl->leased)
788 static int slip_open(struct tty_struct *tty)  argument
796 	if (tty->ops->write == NULL)
808 	sl = tty->disc_data;
817 	sl = sl_alloc(tty_devnum(tty));
821 	sl->tty = tty;
822 	tty->disc_data = sl;
851 	tty->receive_room = 65536;	/* We don't flow control */
860 	sl->tty = NULL;
861 	tty->disc_data = NULL;
879 static void slip_close(struct tty_struct *tty)  argument
881 	struct slip *sl = tty->disc_data;
884 	if (!sl || sl->magic != SLIP_MAGIC || sl->tty != tty)
888 	tty->disc_data = NULL;
889 	sl->tty = NULL;
904 static int slip_hangup(struct tty_struct *tty)  argument
906 	slip_close(tty);
1070 static int slip_ioctl(struct tty_struct *tty, struct file *file,  argument
1073 	struct slip *sl = tty->disc_data;
1125 		if (!sl->tty) {
1150 		if (!sl->tty) {
1171 		return tty_mode_ioctl(tty, file, cmd, arg);
1176 static long slip_compat_ioctl(struct tty_struct *tty, struct file *file,  argument
1188 		return slip_ioctl(tty, file, cmd,
1212 	if (!sl->tty) {
1261 		if (sl->tty != current->signal->tty &&
1353 			if (sl->tty) {
1355 				tty_hangup(sl->tty);
1371 		if (sl->tty) {
1404 	if (sl->tty == NULL)
1418 				sl->tty->ops->write(sl->tty, &s, 1);
1435 	if (sl->tty == NULL)
1446 			tty_hangup(sl->tty);