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>
diff --git a/drivers/leds/leds-lm355x.c b/drivers/leds/leds-lm355x.c
index 591eb5e..f5112cb 100644
--- a/drivers/leds/leds-lm355x.c
+++ b/drivers/leds/leds-lm355x.c
@@ -413,6 +413,12 @@
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 @@
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 @@
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);