ldsem_down_read   272 drivers/tty/tty_ldisc.c 	ldsem_down_read(&tty->ldisc_sem, MAX_SCHEDULE_TIMEOUT);
ldsem_down_read   155 include/linux/tty_ldisc.h extern int ldsem_down_read(struct ld_semaphore *sem, long timeout);
ldsem_down_read   169 include/linux/tty_ldisc.h 		ldsem_down_read(sem, timeout)