v4l2_device_supports_requests 450 drivers/media/v4l2-core/v4l2-dev.c if (v4l2_device_supports_requests(vdev->v4l2_dev)) { v4l2_device_supports_requests 2871 drivers/media/v4l2-core/v4l2-ioctl.c if (v4l2_device_supports_requests(vfd->v4l2_dev) &&