6 - if ((E->flags & (1 << TTY_DO_WRITE_WAKEUP)) && E->ldisc.write_wakeup)
8 - if (test_bit(TTY_DO_WRITE_WAKEUP, &E->flags) && E->ldisc.write_wakeup)
10 - (E->ldisc.write_wakeup)(E);
13 - wake_up_interruptible(&E->write_wait);
19 - if (E->ldisc.flush_buffer) E->ldisc.flush_buffer(E);