drivers/tty/tty_ldisc.c

141 	struct tty_ldisc *ld;
165 	ld = kmalloc(sizeof(struct tty_ldisc), GFP_KERNEL | __GFP_NOFAIL);
166 	ld->ops = ldops;
167 	ld->tty = tty;
169 	return ld;
174  * @ld: lisdsc to release
178 static void tty_ldisc_put(struct tty_ldisc *ld)
180 	if (WARN_ON_ONCE(!ld))
183 	put_ldops(ld->ops);
184 	kfree(ld);
241 	struct tty_ldisc *ld;
244 	ld = tty->ldisc;
245 	if (!ld)
247 	return ld;
261 	struct tty_ldisc *ld = NULL;
264 		ld = tty->ldisc;
265 		if (!ld)
268 	return ld;
274  * @ld: reference to free up
279 void tty_ldisc_deref(struct tty_ldisc *ld)
281 	ldsem_up_read(&ld->tty->ldisc_sem);
386 	struct tty_ldisc *ld = tty_ldisc_ref(tty);
388 	tty_buffer_flush(tty, ld);
389 	if (ld)
390 		tty_ldisc_deref(ld);
420  * @ld: discipline to open
426 static int tty_ldisc_open(struct tty_struct *tty, struct tty_ldisc *ld)
429 	if (ld->ops->open) {
432 		ret = ld->ops->open(tty);
436 		tty_ldisc_debug(tty, "%p: opened\n", ld);
445  * @ld: discipline to close
449 static void tty_ldisc_close(struct tty_struct *tty, struct tty_ldisc *ld)
454 	if (ld->ops->close)
455 		ld->ops->close(tty);
456 	tty_ldisc_debug(tty, "%p: closed\n", ld);
462  * @ld: ldisc we are trying to fail back to
467 static int tty_ldisc_failto(struct tty_struct *tty, int ld)
469 	struct tty_ldisc *disc = tty_ldisc_get(tty, ld);
476 	tty_set_termios_ldisc(tty, ld);
649 	struct tty_ldisc *ld;
653 	ld = tty_ldisc_get(tty, disc);
654 	if (IS_ERR(ld)) {
656 		return PTR_ERR(ld);
665 	tty->ldisc = ld;
692 	struct tty_ldisc *ld;
696 	ld = tty_ldisc_ref(tty);
697 	if (ld != NULL) {
698 		if (ld->ops->flush_buffer)
699 			ld->ops->flush_buffer(tty);
702 		    ld->ops->write_wakeup)
703 			ld->ops->write_wakeup(tty);
704 		if (ld->ops->hangup)
705 			ld->ops->hangup(tty);
706 		tty_ldisc_deref(ld);
803 	struct tty_ldisc *ld = tty_ldisc_get(tty, N_TTY);
805 	if (IS_ERR(ld))
806 		return PTR_ERR(ld);
807 	tty->ldisc = ld;