From fe29a3b0bb375aeac1c995904369553e62d03d75 Mon Sep 17 00:00:00 2001 From: Johan Hovold Date: Wed, 25 Jun 2014 10:08:48 -0700 Subject: leds: lm3642: fix attribute-creation race Use the attribute groups of the led-class to create the flash and torch-LED attributes during probe in order to avoid racing with userspace. Signed-off-by: Johan Hovold Signed-off-by: Bryan Wu --- drivers/leds/leds-lm3642.c | 30 ++++++++++++++---------------- 1 file changed, 14 insertions(+), 16 deletions(-) (limited to 'drivers/leds') diff --git a/drivers/leds/leds-lm3642.c b/drivers/leds/leds-lm3642.c index ceb6b3cde6fe..d3dec0132769 100644 --- a/drivers/leds/leds-lm3642.c +++ b/drivers/leds/leds-lm3642.c @@ -313,6 +313,18 @@ static const struct regmap_config lm3642_regmap = { .max_register = REG_MAX, }; +static struct attribute *lm3642_flash_attrs[] = { + &dev_attr_strobe_pin.attr, + NULL +}; +ATTRIBUTE_GROUPS(lm3642_flash); + +static struct attribute *lm3642_torch_attrs[] = { + &dev_attr_torch_pin.attr, + NULL +}; +ATTRIBUTE_GROUPS(lm3642_torch); + static int lm3642_probe(struct i2c_client *client, const struct i2c_device_id *id) { @@ -364,17 +376,13 @@ static int lm3642_probe(struct i2c_client *client, chip->cdev_flash.max_brightness = 16; chip->cdev_flash.brightness_set = lm3642_strobe_brightness_set; chip->cdev_flash.default_trigger = "flash"; + chip->cdev_flash.groups = lm3642_flash_groups, err = led_classdev_register((struct device *) &client->dev, &chip->cdev_flash); if (err < 0) { dev_err(chip->dev, "failed to register flash\n"); goto err_out; } - err = device_create_file(chip->cdev_flash.dev, &dev_attr_strobe_pin); - if (err < 0) { - dev_err(chip->dev, "failed to create strobe-pin file\n"); - goto err_create_flash_pin_file; - } /* torch */ INIT_WORK(&chip->work_torch, lm3642_deferred_torch_brightness_set); @@ -382,17 +390,13 @@ static int lm3642_probe(struct i2c_client *client, chip->cdev_torch.max_brightness = 8; chip->cdev_torch.brightness_set = lm3642_torch_brightness_set; chip->cdev_torch.default_trigger = "torch"; + chip->cdev_torch.groups = lm3642_torch_groups, err = led_classdev_register((struct device *) &client->dev, &chip->cdev_torch); if (err < 0) { dev_err(chip->dev, "failed to register torch\n"); goto err_create_torch_file; } - err = device_create_file(chip->cdev_torch.dev, &dev_attr_torch_pin); - if (err < 0) { - dev_err(chip->dev, "failed to create torch-pin file\n"); - goto err_create_torch_pin_file; - } /* indicator */ INIT_WORK(&chip->work_indicator, @@ -411,12 +415,8 @@ static int lm3642_probe(struct i2c_client *client, return 0; err_create_indicator_file: - device_remove_file(chip->cdev_torch.dev, &dev_attr_torch_pin); -err_create_torch_pin_file: led_classdev_unregister(&chip->cdev_torch); err_create_torch_file: - device_remove_file(chip->cdev_flash.dev, &dev_attr_strobe_pin); -err_create_flash_pin_file: led_classdev_unregister(&chip->cdev_flash); err_out: return err; @@ -428,10 +428,8 @@ static int lm3642_remove(struct i2c_client *client) led_classdev_unregister(&chip->cdev_indicator); flush_work(&chip->work_indicator); - device_remove_file(chip->cdev_torch.dev, &dev_attr_torch_pin); led_classdev_unregister(&chip->cdev_torch); flush_work(&chip->work_torch); - device_remove_file(chip->cdev_flash.dev, &dev_attr_strobe_pin); led_classdev_unregister(&chip->cdev_flash); flush_work(&chip->work_flash); regmap_write(chip->regmap, REG_ENABLE, 0); -- cgit v1.2.3