[Qemu-devel] question on virtio ccw

[Michael S. Tsirkin]

I see this in ccw in qemu:

            if (virtio_set_status(vdev, status) == 0) {
                if (vdev->status == 0) {
                    virtio_ccw_reset_virtio(dev, vdev);
                }
                if (status & VIRTIO_CONFIG_S_DRIVER_OK) {
                    virtio_ccw_start_ioeventfd(dev);
                }
                sch->curr_status.scsw.count = ccw.count - sizeof(status);
                ret = 0;
            } else {
                /* Trigger a command reject. */
                ret = -ENOSYS;
            }

virtio_set_status on success sets vdev->status to status.
Why check vdev->status in one place and status in another?

-- 
MST