media: v4l2-flash: Check whether setting LED brightness succeeded

Setting LED brightness may return an error but the return value was never
checked by the V4L2 flash LED class. Do it now.
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/v4l2-core/v4l2-flash-led-class.c

@@ -76,8 +76,8 @@ static s32 __led_brightness_to_intensity(struct v4l2_ctrl *ctrl,
 	return (brightness * ctrl->step) + ctrl->minimum;
 }
 
-static void v4l2_flash_set_led_brightness(struct v4l2_flash *v4l2_flash,
-					struct v4l2_ctrl *ctrl)
+static int v4l2_flash_set_led_brightness(struct v4l2_flash *v4l2_flash,
+					 struct v4l2_ctrl *ctrl)
 {
 	struct v4l2_ctrl **ctrls = v4l2_flash->ctrls;
 	struct led_classdev *led_cdev;
@@ -103,20 +103,20 @@ static void v4l2_flash_set_led_brightness(struct v4l2_flash *v4l2_flash,
 
 	if (ctrl == ctrls[TORCH_INTENSITY]) {
 		if (ctrls[LED_MODE]->val != V4L2_FLASH_LED_MODE_TORCH)
-			return;
+			return 0;
 
 		if (WARN_ON_ONCE(!v4l2_flash->fled_cdev))
-			return;
+			return -EINVAL;
 
 		led_cdev = &v4l2_flash->fled_cdev->led_cdev;
 	} else {
 		if (WARN_ON_ONCE(!v4l2_flash->iled_cdev))
-			return;
+			return -EINVAL;
 
 		led_cdev = v4l2_flash->iled_cdev;
 	}
 
-	led_set_brightness_sync(led_cdev, brightness);
+	return led_set_brightness_sync(led_cdev, brightness);
 }
 
 static int v4l2_flash_update_led_brightness(struct v4l2_flash *v4l2_flash,
@@ -222,8 +222,7 @@ static int v4l2_flash_s_ctrl(struct v4l2_ctrl *c)
 	switch (c->id) {
 	case V4L2_CID_FLASH_TORCH_INTENSITY:
 	case V4L2_CID_FLASH_INDICATOR_INTENSITY:
-		v4l2_flash_set_led_brightness(v4l2_flash, c);
-		return 0;
+		return v4l2_flash_set_led_brightness(v4l2_flash, c);
 	}
 
 	if (!fled_cdev)
@@ -262,9 +261,8 @@ static int v4l2_flash_s_ctrl(struct v4l2_ctrl *c)
 			if (ret < 0)
 				return ret;
 
-			v4l2_flash_set_led_brightness(v4l2_flash,
-							ctrls[TORCH_INTENSITY]);
-			return 0;
+			return v4l2_flash_set_led_brightness(v4l2_flash,
+							     ctrls[TORCH_INTENSITY]);
 		}
 		break;
 	case V4L2_CID_FLASH_STROBE_SOURCE:
@@ -511,13 +509,19 @@ static int __sync_device_with_v4l2_controls(struct v4l2_flash *v4l2_flash)
 	struct v4l2_ctrl **ctrls = v4l2_flash->ctrls;
 	int ret = 0;
 
-	if (ctrls[TORCH_INTENSITY])
-		v4l2_flash_set_led_brightness(v4l2_flash,
-					      ctrls[TORCH_INTENSITY]);
+	if (ctrls[TORCH_INTENSITY]) {
+		ret = v4l2_flash_set_led_brightness(v4l2_flash,
+						    ctrls[TORCH_INTENSITY]);
+		if (ret < 0)
+			return ret;
+	}
 
-	if (ctrls[INDICATOR_INTENSITY])
-		v4l2_flash_set_led_brightness(v4l2_flash,
-						ctrls[INDICATOR_INTENSITY]);
+	if (ctrls[INDICATOR_INTENSITY]) {
+		ret = v4l2_flash_set_led_brightness(v4l2_flash,
+						    ctrls[INDICATOR_INTENSITY]);
+		if (ret < 0)
+			return ret;
+	}
 
 	if (ctrls[FLASH_TIMEOUT]) {
 		if (WARN_ON_ONCE(!fled_cdev))