IDEV_IO_READY
clear_bit(IDEV_IO_READY, &idev->flags);
clear_bit(IDEV_IO_READY, &idev->flags);
set_bit(IDEV_IO_READY, &idev->flags);
return idev ? test_bit(IDEV_IO_READY, &idev->flags) ||
(!test_bit(IDEV_IO_READY, &idev->flags) &&