drivers/leds/flash/leds-rt8515.c:354: undefined reference to `v4l2_flash_init'

[kernel test robot]

Hi Linus,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   291009f656e8eaebbdfd3a8d99f6b190a9ce9deb
commit: e1c6edcbea13de025c3406645b4cce4ac3baf973 leds: rt8515: Add Richtek RT8515 LED driver
date:   11 days ago
config: i386-randconfig-a005-20210209 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e1c6edcbea13de025c3406645b4cce4ac3baf973
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout e1c6edcbea13de025c3406645b4cce4ac3baf973
        # save the attached .config to linux build tree
        make W=1 ARCH=i386 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All errors (new ones prefixed by >>):

   ld: drivers/leds/flash/leds-rt8515.o: in function `rt8515_v4l2_flash_release':
   drivers/leds/flash/leds-rt8515.c:216: undefined reference to `v4l2_flash_release'
   ld: drivers/leds/flash/leds-rt8515.o: in function `rt8515_probe':
>> drivers/leds/flash/leds-rt8515.c:354: undefined reference to `v4l2_flash_init'


vim +354 drivers/leds/flash/leds-rt8515.c

   275	
   276	static int rt8515_probe(struct platform_device *pdev)
   277	{
   278		struct device *dev = &pdev->dev;
   279		struct fwnode_handle *child;
   280		struct rt8515 *rt;
   281		struct led_classdev *led;
   282		struct led_classdev_flash *fled;
   283		struct led_init_data init_data = {};
   284		struct v4l2_flash_config v4l2_sd_cfg = {};
   285		int ret;
   286	
   287		rt = devm_kzalloc(dev, sizeof(*rt), GFP_KERNEL);
   288		if (!rt)
   289			return -ENOMEM;
   290	
   291		rt->dev = dev;
   292		fled = &rt->fled;
   293		led = &fled->led_cdev;
   294	
   295		/* ENF - Enable Flash line */
   296		rt->enable_flash = devm_gpiod_get(dev, "enf", GPIOD_OUT_LOW);
   297		if (IS_ERR(rt->enable_flash))
   298			return dev_err_probe(dev, PTR_ERR(rt->enable_flash),
   299					     "cannot get ENF (enable flash) GPIO\n");
   300	
   301		/* ENT - Enable Torch line */
   302		rt->enable_torch = devm_gpiod_get(dev, "ent", GPIOD_OUT_LOW);
   303		if (IS_ERR(rt->enable_torch))
   304			return dev_err_probe(dev, PTR_ERR(rt->enable_torch),
   305					     "cannot get ENT (enable torch) GPIO\n");
   306	
   307		child = fwnode_get_next_available_child_node(dev->fwnode, NULL);
   308		if (!child) {
   309			dev_err(dev,
   310				"No fwnode child node found for connected LED.\n");
   311			return -EINVAL;
   312		}
   313		init_data.fwnode = child;
   314	
   315		rt8515_determine_max_intensity(rt, child, "richtek,rfs-ohms",
   316					       "flash-max-microamp",
   317					       RT8515_FLASH_MAX,
   318					       &rt->flash_max_intensity);
   319		rt8515_determine_max_intensity(rt, child, "richtek,rts-ohms",
   320					       "led-max-microamp",
   321					       RT8515_TORCH_MAX,
   322					       &rt->torch_max_intensity);
   323	
   324		ret = fwnode_property_read_u32(child, "flash-max-timeout-us",
   325					       &rt->max_timeout);
   326		if (ret) {
   327			rt->max_timeout = RT8515_MAX_TIMEOUT_US;
   328			dev_warn(dev,
   329				 "flash-max-timeout-us property missing\n");
   330		}
   331		timer_setup(&rt->powerdown_timer, rt8515_powerdown_timer, 0);
   332		rt8515_init_flash_timeout(rt);
   333	
   334		fled->ops = &rt8515_flash_ops;
   335	
   336		led->max_brightness = rt->torch_max_intensity;
   337		led->brightness_set_blocking = rt8515_led_brightness_set;
   338		led->flags |= LED_CORE_SUSPENDRESUME | LED_DEV_CAP_FLASH;
   339	
   340		mutex_init(&rt->lock);
   341	
   342		platform_set_drvdata(pdev, rt);
   343	
   344		ret = devm_led_classdev_flash_register_ext(dev, fled, &init_data);
   345		if (ret) {
   346			dev_err(dev, "can't register LED %s\n", led->name);
   347			mutex_destroy(&rt->lock);
   348			return ret;
   349		}
   350	
   351		rt8515_init_v4l2_flash_config(rt, &v4l2_sd_cfg);
   352	
   353		/* Create a V4L2 Flash device if V4L2 flash is enabled */
 > 354		rt->v4l2_flash = v4l2_flash_init(dev, child, fled, NULL, &v4l2_sd_cfg);
   355		if (IS_ERR(rt->v4l2_flash)) {
   356			ret = PTR_ERR(rt->v4l2_flash);
   357			dev_err(dev, "failed to register V4L2 flash device (%d)\n",
   358				ret);
   359			/*
   360			 * Continue without the V4L2 flash
   361			 * (we still have the classdev)
   362			 */
   363		}
   364	
   365		return 0;
   366	}
   367	

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