Hi Sakari, Hans recommends me using v4l2_fh_is_singular in first open, but I found it used list_is_singular(&fh->list). Should it use &fh->vdev->fh_list or I missed something? Regards, Scott -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html