310 	if (!vdev->fops->read)  in v4l2_read()
313 		ret = vdev->fops->read(filp, buf, sz, off);  in v4l2_read()
327 	if (!vdev->fops->write)  in v4l2_write()
330 		ret = vdev->fops->write(filp, buf, sz, off);  in v4l2_write()
343 	if (!vdev->fops->poll)  in v4l2_poll()
346 		res = vdev->fops->poll(filp, poll);  in v4l2_poll()
358 	if (vdev->fops->unlocked_ioctl) {  in v4l2_ioctl()
360 			ret = vdev->fops->unlocked_ioctl(filp, cmd, arg);  in v4l2_ioctl()
377 	if (!vdev->fops->get_unmapped_area)  in v4l2_get_unmapped_area()
381 	ret = vdev->fops->get_unmapped_area(filp, addr, len, pgoff, flags);  in v4l2_get_unmapped_area()
394 	if (!vdev->fops->mmap)  in v4l2_mmap()
397 		ret = vdev->fops->mmap(filp, vm);  in v4l2_mmap()
421 	if (vdev->fops->open) {  in v4l2_open()
423 			ret = vdev->fops->open(filp);  in v4l2_open()
449 	if (vdev->fops->release) {  in v4l2_release()
452 			ret = vdev->fops->release(filp);  in v4l2_release()
455 			ret = vdev->fops->release(filp);  in v4l2_release()