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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>
This commit is contained in:
Johan Hovold 2014-06-25 10:08:50 -07:00 committed by Bryan Wu
parent 35c164998e
commit 588a6a9928
1 changed files with 13 additions and 18 deletions
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31
drivers/leds/leds-netxbig.c
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@ -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)