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authorRoland Stigge <stigge@antcom.de>2012-10-28 08:34:59 -0700
committerBryan Wu <cooloney@gmail.com>2012-11-26 14:28:49 -0800
commit04553e925baaa815025c6fd3cdc301a794fa2c74 (patch)
tree39d49a08fca20eccdb2dc308a15e81f41096fc7d /drivers/leds
parente8941928faf248530c0eff95462e9fee0b1cc8da (diff)
leds: leds-gpio: Defer probing in case of deferred gpio probing
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>
Diffstat (limited to 'drivers/leds')
-rw-r--r--drivers/leds/leds-gpio.c17
1 files changed, 11 insertions, 6 deletions
diff --git a/drivers/leds/leds-gpio.c b/drivers/leds/leds-gpio.c
index 0b418531526..6a2109638fb 100644
--- a/drivers/leds/leds-gpio.c
+++ b/drivers/leds/leds-gpio.c
@@ -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);