303 	if (!vdev->fops->read)  in v4l2_read()
306 		ret = vdev->fops->read(filp, buf, sz, off);  in v4l2_read()
320 	if (!vdev->fops->write)  in v4l2_write()
323 		ret = vdev->fops->write(filp, buf, sz, off);  in v4l2_write()
336 	if (!vdev->fops->poll)  in v4l2_poll()
339 		res = vdev->fops->poll(filp, poll);  in v4l2_poll()
351 	if (vdev->fops->unlocked_ioctl) {  in v4l2_ioctl()
357 			ret = vdev->fops->unlocked_ioctl(filp, cmd, arg);  in v4l2_ioctl()
376 	if (!vdev->fops->get_unmapped_area)  in v4l2_get_unmapped_area()
380 	ret = vdev->fops->get_unmapped_area(filp, addr, len, pgoff, flags);  in v4l2_get_unmapped_area()
393 	if (!vdev->fops->mmap)  in v4l2_mmap()
396 		ret = vdev->fops->mmap(filp, vm);  in v4l2_mmap()
420 	if (vdev->fops->open) {  in v4l2_open()
422 			ret = vdev->fops->open(filp);  in v4l2_open()
442 	if (vdev->fops->release)  in v4l2_release()
443 		ret = vdev->fops->release(filp);  in v4l2_release()