legacy_mutex 2989 drivers/tty/tty_io.c mutex_init(&tty->legacy_mutex); legacy_mutex 19 drivers/tty/tty_mutex.c mutex_lock(&tty->legacy_mutex); legacy_mutex 30 drivers/tty/tty_mutex.c ret = mutex_lock_interruptible(&tty->legacy_mutex); legacy_mutex 40 drivers/tty/tty_mutex.c mutex_unlock(&tty->legacy_mutex); legacy_mutex 59 drivers/tty/tty_mutex.c lockdep_set_subclass(&tty->legacy_mutex, TTY_LOCK_SLAVE); legacy_mutex 298 include/linux/tty.h struct mutex legacy_mutex;