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>

diff --git a/drivers/leds/leds-lm3533.c b/drivers/leds/leds-lm3533.c
index e2c642c1169b93aef41014fc0a2100bb8a7f8057..cbf61a40137da7a6f022a22eb7afa5fa0e142e12 100644 (file)
--- a/drivers/leds/leds-lm3533.c
+++ b/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);