From b10474aafe80cf50afe7d299d3cc8a60efe3e69b Mon Sep 17 00:00:00 2001 From: Sebastian Reichel Date: Fri, 28 Sep 2018 11:00:32 +0200 Subject: [PATCH] power: supply: ds2780: fix race-condition in sysfs registration This registers custom sysfs properties using the native functionality of the power-supply framework, which cleans up the code a bit and fixes a race-condition. Before this patch the sysfs attributes were not properly registered to udev. Signed-off-by: Sebastian Reichel --- drivers/power/supply/ds2780_battery.c | 23 ++++------------------- 1 file changed, 4 insertions(+), 19 deletions(-) diff --git a/drivers/power/supply/ds2780_battery.c b/drivers/power/supply/ds2780_battery.c index cad14ba1..f7e617e 100644 --- a/drivers/power/supply/ds2780_battery.c +++ b/drivers/power/supply/ds2780_battery.c @@ -723,7 +723,7 @@ static DEVICE_ATTR(pio_pin, S_IRUGO | S_IWUSR, ds2780_get_pio_pin, ds2780_set_pio_pin); -static struct attribute *ds2780_attributes[] = { +static struct attribute *ds2780_sysfs_attrs[] = { &dev_attr_pmod_enabled.attr, &dev_attr_sense_resistor_value.attr, &dev_attr_rsgain_setting.attr, @@ -731,9 +731,7 @@ static struct attribute *ds2780_attributes[] = { NULL }; -static const struct attribute_group ds2780_attr_group = { - .attrs = ds2780_attributes, -}; +ATTRIBUTE_GROUPS(ds2780_sysfs); static int ds2780_battery_probe(struct platform_device *pdev) { @@ -758,6 +756,7 @@ static int ds2780_battery_probe(struct platform_device *pdev) dev_info->bat_desc.get_property = ds2780_battery_get_property; psy_cfg.drv_data = dev_info; + psy_cfg.attr_grp = ds2780_sysfs_groups; dev_info->bat = power_supply_register(&pdev->dev, &dev_info->bat_desc, &psy_cfg); @@ -767,18 +766,12 @@ static int ds2780_battery_probe(struct platform_device *pdev) goto fail; } - ret = sysfs_create_group(&dev_info->bat->dev.kobj, &ds2780_attr_group); - if (ret) { - dev_err(dev_info->dev, "failed to create sysfs group\n"); - goto fail_unregister; - } - ret = sysfs_create_bin_file(&dev_info->bat->dev.kobj, &ds2780_param_eeprom_bin_attr); if (ret) { dev_err(dev_info->dev, "failed to create param eeprom bin file"); - goto fail_remove_group; + goto fail_unregister; } ret = sysfs_create_bin_file(&dev_info->bat->dev.kobj, @@ -794,8 +787,6 @@ static int ds2780_battery_probe(struct platform_device *pdev) fail_remove_bin_file: sysfs_remove_bin_file(&dev_info->bat->dev.kobj, &ds2780_param_eeprom_bin_attr); -fail_remove_group: - sysfs_remove_group(&dev_info->bat->dev.kobj, &ds2780_attr_group); fail_unregister: power_supply_unregister(dev_info->bat); fail: @@ -806,12 +797,6 @@ static int ds2780_battery_remove(struct platform_device *pdev) { struct ds2780_device_info *dev_info = platform_get_drvdata(pdev); - /* - * Remove attributes before unregistering power supply - * because 'bat' will be freed on power_supply_unregister() call. - */ - sysfs_remove_group(&dev_info->bat->dev.kobj, &ds2780_attr_group); - power_supply_unregister(dev_info->bat); return 0; -- 2.7.4