leds: netxbig: fix attribute-creation race

Use the attribute groups of the led-class to create the sata attribute
during probe in order to avoid racing with userspace.

[cooloney@gmail.com: clean up return led_classdev_register()]
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Bryan Wu <cooloney@gmail.com>

drivers/leds/leds-netxbig.c

@@ -293,10 +293,14 @@ static ssize_t netxbig_led_sata_show(struct device *dev,
 
 static DEVICE_ATTR(sata, 0644, netxbig_led_sata_show, netxbig_led_sata_store);
 
+static struct attribute *netxbig_led_attrs[] = {
+	&dev_attr_sata.attr,
+	NULL
+};
+ATTRIBUTE_GROUPS(netxbig_led);
+
 static void delete_netxbig_led(struct netxbig_led_data *led_dat)
 {
-	if (led_dat->mode_val[NETXBIG_LED_SATA] != NETXBIG_LED_INVALID_MODE)
-		device_remove_file(led_dat->cdev.dev, &dev_attr_sata);
 	led_classdev_unregister(&led_dat->cdev);
 }
 
@@ -306,7 +310,6 @@ create_netxbig_led(struct platform_device *pdev,
 		   const struct netxbig_led *template)
 {
 	struct netxbig_led_platform_data *pdata = dev_get_platdata(&pdev->dev);
-	int ret;
 
 	spin_lock_init(&led_dat->lock);
 	led_dat->gpio_ext = pdata->gpio_ext;
@@ -327,6 +330,12 @@ create_netxbig_led(struct platform_device *pdev,
 	led_dat->sata = 0;
 	led_dat->cdev.brightness = LED_OFF;
 	led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
+	/*
+	 * If available, expose the SATA activity blink capability through
+	 * a "sata" sysfs attribute.
+	 */
+	if (led_dat->mode_val[NETXBIG_LED_SATA] != NETXBIG_LED_INVALID_MODE)
+		led_dat->cdev.groups = netxbig_led_groups;
 	led_dat->mode_addr = template->mode_addr;
 	led_dat->mode_val = template->mode_val;
 	led_dat->bright_addr = template->bright_addr;
@@ -334,21 +343,7 @@ create_netxbig_led(struct platform_device *pdev,
 	led_dat->timer = pdata->timer;
 	led_dat->num_timer = pdata->num_timer;
 
-	ret = led_classdev_register(&pdev->dev, &led_dat->cdev);
-	if (ret < 0)
-		return ret;
-
-	/*
-	 * If available, expose the SATA activity blink capability through
-	 * a "sata" sysfs attribute.
-	 */
-	if (led_dat->mode_val[NETXBIG_LED_SATA] != NETXBIG_LED_INVALID_MODE) {
-		ret = device_create_file(led_dat->cdev.dev, &dev_attr_sata);
-		if (ret)
-			led_classdev_unregister(&led_dat->cdev);
-	}
-
-	return ret;
+	return led_classdev_register(&pdev->dev, &led_dat->cdev);
 }
 
 static int netxbig_led_probe(struct platform_device *pdev)