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Merge branch 'leds-fixes-for-3.13' of git://git.kernel.org/pub/scm/linux/kernel/git/cooloney/linux-leds 

Pull LED subsystem bugfix from Bryan Wu.

* 'leds-fixes-for-3.13' of git://git.kernel.org/pub/scm/linux/kernel/git/cooloney/linux-leds:
  leds: pwm: Fix for deferred probe in DT booted mode
This commit is contained in:
Linus Torvalds 2013-12-02 12:08:01 -08:00
parent b655028795 aa1a6d6d74
commit dea4f48a0a
1 changed files with 26 additions and 27 deletions
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53
drivers/leds/leds-pwm.c
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@ -82,22 +82,12 @@ static inline size_t sizeof_pwm_leds_priv(int num_leds)
(sizeof(struct led_pwm_data) * num_leds);
}
static struct led_pwm_priv *led_pwm_create_of(struct platform_device *pdev)
static int led_pwm_create_of(struct platform_device *pdev,
struct led_pwm_priv *priv)
{
struct device_node *node = pdev->dev.of_node;
struct device_node *child;
struct led_pwm_priv *priv;
int count, ret;
/* count LEDs in this device, so we know how much to allocate */
count = of_get_child_count(node);
if (!count)
return NULL;
priv = devm_kzalloc(&pdev->dev, sizeof_pwm_leds_priv(count),
GFP_KERNEL);
if (!priv)
return NULL;
int ret;
for_each_child_of_node(node, child) {
struct led_pwm_data *led_dat = &priv->leds[priv->num_leds];
@ -109,6 +99,7 @@ static struct led_pwm_priv *led_pwm_create_of(struct platform_device *pdev)
if (IS_ERR(led_dat->pwm)) {
dev_err(&pdev->dev, "unable to request PWM for %s\n",
led_dat->cdev.name);
ret = PTR_ERR(led_dat->pwm);
goto err;
}
/* Get the period from PWM core when n*/
@ -137,28 +128,36 @@ static struct led_pwm_priv *led_pwm_create_of(struct platform_device *pdev)
priv->num_leds++;
}
return priv;
return 0;
err:
while (priv->num_leds--)
led_classdev_unregister(&priv->leds[priv->num_leds].cdev);
return NULL;
return ret;
}
static int led_pwm_probe(struct platform_device *pdev)
{
struct led_pwm_platform_data *pdata = dev_get_platdata(&pdev->dev);
struct led_pwm_priv *priv;
int i, ret = 0;
int count, i;
int ret = 0;
if (pdata && pdata->num_leds) {
priv = devm_kzalloc(&pdev->dev,
sizeof_pwm_leds_priv(pdata->num_leds),
GFP_KERNEL);
if (!priv)
return -ENOMEM;
if (pdata)
count = pdata->num_leds;
else
count = of_get_child_count(pdev->dev.of_node);
for (i = 0; i < pdata->num_leds; i++) {
if (!count)
return -EINVAL;
priv = devm_kzalloc(&pdev->dev, sizeof_pwm_leds_priv(count),
GFP_KERNEL);
if (!priv)
return -ENOMEM;
if (pdata) {
for (i = 0; i < count; i++) {
struct led_pwm *cur_led = &pdata->leds[i];
struct led_pwm_data *led_dat = &priv->leds[i];
@ -188,11 +187,11 @@ static int led_pwm_probe(struct platform_device *pdev)
if (ret < 0)
goto err;
}
priv->num_leds = pdata->num_leds;
priv->num_leds = count;
} else {
priv = led_pwm_create_of(pdev);
if (!priv)
return -ENODEV;
ret = led_pwm_create_of(pdev, priv);
if (ret)
return ret;
}
platform_set_drvdata(pdev, priv);