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 <sebastian.reichel@collabora.com>

diff --git a/drivers/power/supply/ds2780_battery.c b/drivers/power/supply/ds2780_battery.c
index cad14ba..f7e617e 100644 (file)
--- 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;