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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>
This commit is contained in:
Johan Hovold 2014-06-25 10:08:46 -07:00 committed by Bryan Wu
parent 74c8503943
commit 9db9386016
1 changed files with 8 additions and 12 deletions
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20
drivers/leds/leds-lm3533.c
View File

@ -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);