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authorJohan Hovold <johan@kernel.org>2014-06-25 10:08:47 -0700
committerBryan Wu <cooloney@gmail.com>2014-06-25 15:10:54 -0700
commit0d25376c326220687a2dccb5c40b785a7499326c (patch)
tree7ff26332ab553647fa143ea55cf40bf98a716d37 /drivers/leds
parent9db9386016c6cfc6a6af3bacc7043cab8ff04ecf (diff)
leds: lm355x: fix attribute-creation race
Use the attribute groups of the led-class to create the indicator-LED attributes during probe in order to avoid racing with userspace. Note that the comment about the pattern attribute only being for LM3554 was incorrect and did not match the code (the original leds-lm3556 driver had the attribute before LM3554 support was added). Signed-off-by: Johan Hovold <johan@kernel.org> Signed-off-by: Bryan Wu <cooloney@gmail.com>
Diffstat (limited to 'drivers/leds')
-rw-r--r--drivers/leds/leds-lm355x.c21
1 files changed, 9 insertions, 12 deletions
diff --git a/drivers/leds/leds-lm355x.c b/drivers/leds/leds-lm355x.c
index 591eb5e58ae3..f5112cb2d991 100644
--- a/drivers/leds/leds-lm355x.c
+++ b/drivers/leds/leds-lm355x.c
@@ -413,6 +413,12 @@ out:
static DEVICE_ATTR(pattern, S_IWUSR, NULL, lm3556_indicator_pattern_store);
+static struct attribute *lm355x_indicator_attrs[] = {
+ &dev_attr_pattern.attr,
+ NULL
+};
+ATTRIBUTE_GROUPS(lm355x_indicator);
+
static const struct regmap_config lm355x_regmap = {
.reg_bits = 8,
.val_bits = 8,
@@ -501,25 +507,18 @@ static int lm355x_probe(struct i2c_client *client,
else
chip->cdev_indicator.max_brightness = 8;
chip->cdev_indicator.brightness_set = lm355x_indicator_brightness_set;
+ /* indicator pattern control only for LM3556 */
+ if (id->driver_data == CHIP_LM3556)
+ chip->cdev_indicator.groups = lm355x_indicator_groups;
err = led_classdev_register((struct device *)
&client->dev, &chip->cdev_indicator);
if (err < 0)
goto err_create_indicator_file;
- /* indicator pattern control only for LM3554 */
- if (id->driver_data == CHIP_LM3556) {
- err =
- device_create_file(chip->cdev_indicator.dev,
- &dev_attr_pattern);
- if (err < 0)
- goto err_create_pattern_file;
- }
dev_info(&client->dev, "%s is initialized\n",
lm355x_name[id->driver_data]);
return 0;
-err_create_pattern_file:
- led_classdev_unregister(&chip->cdev_indicator);
err_create_indicator_file:
led_classdev_unregister(&chip->cdev_torch);
err_create_torch_file:
@@ -534,8 +533,6 @@ static int lm355x_remove(struct i2c_client *client)
struct lm355x_reg_data *preg = chip->regs;
regmap_write(chip->regmap, preg[REG_OPMODE].regno, 0);
- if (chip->type == CHIP_LM3556)
- device_remove_file(chip->cdev_indicator.dev, &dev_attr_pattern);
led_classdev_unregister(&chip->cdev_indicator);
flush_work(&chip->work_indicator);
led_classdev_unregister(&chip->cdev_torch);