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leds: leds-gpio: Defer probing in case of deferred gpio probing

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This patch makes leds-gpio's probe() return -EPROBE_DEFER if any of the gpios
to register are deferred themselves. This makes a change of
gpio_leds_create_of()'s return value necessary: Instead of returning NULL on
error, we now use ERR_PTR() error coding.

Signed-off-by: Roland Stigge <stigge@antcom.de>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
This commit is contained in:
Roland Stigge 2012-10-28 08:34:59 -07:00 committed by Bryan Wu
parent e8941928fa
commit 04553e925b
1 changed files with 11 additions and 6 deletions
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17
drivers/leds/leds-gpio.c
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@ -21,6 +21,7 @@
#include <linux/workqueue.h>
#include <linux/module.h>
#include <linux/pinctrl/consumer.h>
#include <linux/err.h>
struct gpio_led_data {
struct led_classdev cdev;
@ -174,12 +175,16 @@ static struct gpio_leds_priv * __devinit gpio_leds_create_of(struct platform_dev
/* count LEDs in this device, so we know how much to allocate */
count = of_get_child_count(np);
if (!count)
return NULL;
return ERR_PTR(-ENODEV);
for_each_child_of_node(np, child)
if (of_get_gpio(child, 0) == -EPROBE_DEFER)
return ERR_PTR(-EPROBE_DEFER);
priv = devm_kzalloc(&pdev->dev, sizeof_gpio_leds_priv(count),
GFP_KERNEL);
if (!priv)
return NULL;
return ERR_PTR(-ENOMEM);
for_each_child_of_node(np, child) {
struct gpio_led led = {};
@ -214,7 +219,7 @@ static struct gpio_leds_priv * __devinit gpio_leds_create_of(struct platform_dev
err:
for (count = priv->num_leds - 2; count >= 0; count--)
delete_gpio_led(&priv->leds[count]);
return NULL;
return ERR_PTR(-ENODEV);
}
static const struct of_device_id of_gpio_leds_match[] = {
@ -224,7 +229,7 @@ static const struct of_device_id of_gpio_leds_match[] = {
#else /* CONFIG_OF_GPIO */
static struct gpio_leds_priv * __devinit gpio_leds_create_of(struct platform_device *pdev)
{
return NULL;
return ERR_PTR(-ENODEV);
}
#endif /* CONFIG_OF_GPIO */
@ -262,8 +267,8 @@ static int __devinit gpio_led_probe(struct platform_device *pdev)
}
} else {
priv = gpio_leds_create_of(pdev);
if (!priv)
return -ENODEV;
if (IS_ERR(priv))
return PTR_ERR(priv);
}
platform_set_drvdata(pdev, priv);