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leds: wm831x-status: fix attribute-creation race 

Use the attribute groups of the led-class to create the src 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 10:08:53 -07:00 committed by Bryan Wu
parent 67bd8eb07e
commit b2015ed5ea
1 changed files with 9 additions and 14 deletions
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23
drivers/leds/leds-wm831x-status.c
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@ -219,6 +219,12 @@ static ssize_t wm831x_status_src_store(struct device *dev,
static DEVICE_ATTR(src, 0644, wm831x_status_src_show, wm831x_status_src_store);
static struct attribute *wm831x_status_attrs[] = {
&dev_attr_src.attr,
NULL
};
ATTRIBUTE_GROUPS(wm831x_status);
static int wm831x_status_probe(struct platform_device *pdev)
{
struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
@ -232,8 +238,7 @@ static int wm831x_status_probe(struct platform_device *pdev)
res = platform_get_resource(pdev, IORESOURCE_REG, 0);
if (res == NULL) {
dev_err(&pdev->dev, "No register resource\n");
ret = -EINVAL;
goto err;
return -EINVAL;
}
drvdata = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_status),
@ -284,31 +289,21 @@ static int wm831x_status_probe(struct platform_device *pdev)
drvdata->cdev.default_trigger = pdata.default_trigger;
drvdata->cdev.brightness_set = wm831x_status_set;
drvdata->cdev.blink_set = wm831x_status_blink_set;
drvdata->cdev.groups = wm831x_status_groups;
ret = led_classdev_register(wm831x->dev, &drvdata->cdev);
if (ret < 0) {
dev_err(&pdev->dev, "Failed to register LED: %d\n", ret);
goto err_led;
return ret;
}
ret = device_create_file(drvdata->cdev.dev, &dev_attr_src);
if (ret != 0)
dev_err(&pdev->dev,
"No source control for LED: %d\n", ret);
return 0;
err_led:
led_classdev_unregister(&drvdata->cdev);
err:
return ret;
}
static int wm831x_status_remove(struct platform_device *pdev)
{
struct wm831x_status *drvdata = platform_get_drvdata(pdev);
device_remove_file(drvdata->cdev.dev, &dev_attr_src);
led_classdev_unregister(&drvdata->cdev);
return 0;