leds: lm3533: fix attribute-creation race

Use the attribute groups of the led-class to create the attributes
during probe in order to avoid racing with userspace.
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Bryan Wu <cooloney@gmail.com>

drivers/leds/leds-lm3533.c

@@ -645,6 +645,11 @@ static struct attribute_group lm3533_led_attribute_group = {
 	.attrs		= lm3533_led_attributes
 };
 
+static const struct attribute_group *lm3533_led_attribute_groups[] = {
+	&lm3533_led_attribute_group,
+	NULL
+};
+
 static int lm3533_led_setup(struct lm3533_led *led,
 					struct lm3533_led_platform_data *pdata)
 {
@@ -692,6 +697,7 @@ static int lm3533_led_probe(struct platform_device *pdev)
 	led->cdev.brightness_get = lm3533_led_get;
 	led->cdev.blink_set = lm3533_led_blink_set;
 	led->cdev.brightness = LED_OFF;
+	led->cdev.groups = lm3533_led_attribute_groups,
 	led->id = pdev->id;
 
 	mutex_init(&led->mutex);
@@ -715,25 +721,16 @@ static int lm3533_led_probe(struct platform_device *pdev)
 
 	led->cb.dev = led->cdev.dev;
 
-	ret = sysfs_create_group(&led->cdev.dev->kobj,
-						&lm3533_led_attribute_group);
-	if (ret < 0) {
-		dev_err(&pdev->dev, "failed to create sysfs attributes\n");
-		goto err_unregister;
-	}
-
 	ret = lm3533_led_setup(led, pdata);
 	if (ret)
-		goto err_sysfs_remove;
+		goto err_unregister;
 
 	ret = lm3533_ctrlbank_enable(&led->cb);
 	if (ret)
-		goto err_sysfs_remove;
+		goto err_unregister;
 
 	return 0;
 
-err_sysfs_remove:
-	sysfs_remove_group(&led->cdev.dev->kobj, &lm3533_led_attribute_group);
 err_unregister:
 	led_classdev_unregister(&led->cdev);
 	flush_work(&led->work);
@@ -748,7 +745,6 @@ static int lm3533_led_remove(struct platform_device *pdev)
 	dev_dbg(&pdev->dev, "%s\n", __func__);
 
 	lm3533_ctrlbank_disable(&led->cb);
-	sysfs_remove_group(&led->cdev.dev->kobj, &lm3533_led_attribute_group);
 	led_classdev_unregister(&led->cdev);
 	flush_work(&led->work);