ldsem_down_write  320 drivers/tty/tty_ldisc.c 	return ldsem_down_write(&tty->ldisc_sem, timeout);
ldsem_down_write  157 include/linux/tty_ldisc.h extern int ldsem_down_write(struct ld_semaphore *sem, long timeout);
ldsem_down_write  171 include/linux/tty_ldisc.h 		ldsem_down_write(sem, timeout)