IDEV_STOP_PENDING
wait_event(ihost->eventq, !test_bit(IDEV_STOP_PENDING, &idev->flags));
|| test_bit(IDEV_STOP_PENDING, &idev->flags)
clear_bit(IDEV_STOP_PENDING, &idev->flags);
set_bit(IDEV_STOP_PENDING, &idev->flags);