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leds: ns2: 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.

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 10:08:51 -07:00 committed by Bryan Wu
parent 588a6a9928
commit 475f854826
1 changed files with 7 additions and 9 deletions
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16
drivers/leds/leds-ns2.c
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@ -185,6 +185,12 @@ static ssize_t ns2_led_sata_show(struct device *dev,
static DEVICE_ATTR(sata, 0644, ns2_led_sata_show, ns2_led_sata_store);
static struct attribute *ns2_led_attrs[] = {
&dev_attr_sata.attr,
NULL
};
ATTRIBUTE_GROUPS(ns2_led);
static int
create_ns2_led(struct platform_device *pdev, struct ns2_led_data *led_dat,
const struct ns2_led *template)
@ -219,6 +225,7 @@ create_ns2_led(struct platform_device *pdev, struct ns2_led_data *led_dat,
led_dat->cdev.blink_set = NULL;
led_dat->cdev.brightness_set = ns2_led_set;
led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
led_dat->cdev.groups = ns2_led_groups;
led_dat->cmd = template->cmd;
led_dat->slow = template->slow;
@ -235,20 +242,11 @@ create_ns2_led(struct platform_device *pdev, struct ns2_led_data *led_dat,
if (ret < 0)
return ret;
ret = device_create_file(led_dat->cdev.dev, &dev_attr_sata);
if (ret < 0)
goto err_free_cdev;
return 0;
err_free_cdev:
led_classdev_unregister(&led_dat->cdev);
return ret;
}
static void delete_ns2_led(struct ns2_led_data *led_dat)
{
device_remove_file(led_dat->cdev.dev, &dev_attr_sata);
led_classdev_unregister(&led_dat->cdev);
}