Ezequiel Garc?a [off-list ref] writes:

Another question: when does udev recognizes that this device was plugged?
Probably somewhere inside video_register_device(), right?

Yes, if you look at the extremely long function
__video_register_device() in drivers/media/video/v4l2-dev, you'll find this:

        /* Part 4: register the device with sysfs */
        vdev->dev.class = &video_class;
        vdev->dev.devt = MKDEV(VIDEO_MAJOR, vdev->minor);
        if (vdev->parent)
                vdev->dev.parent = vdev->parent;
        dev_set_name(&vdev->dev, "%s%d", name_base, vdev->num);
        ret = device_register(&vdev->dev);


The device_register() will do a

       kobject_uevent(&dev->kobj, KOBJ_ADD);

 among other things.  That's what udev sees.


Bj?rn