skel_do_read_io
rv = skel_do_read_io(dev, dev->bulk_in_size);
rv = skel_do_read_io(dev, dev->bulk_in_size);
rv = skel_do_read_io(dev, count);
skel_do_read_io(dev, count - chunk);
rv = skel_do_read_io(dev, count);