ACPI: SBS: manage alarm sysfs attribute through psy core

Let the power supply core register the attribute.

This ensures that the attribute is created before the device is
announced to userspace, avoiding a race condition.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/acpi/sbs.c b/drivers/acpi/sbs.c
index 3d81ce3103c6c8fea89b72e3463c5643253cf6a4..7a0914055fca01881c11e1a26e82707308000436 100644 (file)
--- a/drivers/acpi/sbs.c
+++ b/drivers/acpi/sbs.c
@@ -77,7 +77,6 @@ struct acpi_battery {
        u16 spec;
        u8 id;
        u8 present:1;
-       u8 have_sysfs_alarm:1;
 };
 
 #define to_acpi_battery(x) power_supply_get_drvdata(x)
@@ -462,12 +461,18 @@ static ssize_t acpi_battery_alarm_store(struct device *dev,
        return count;
 }
 
-static const struct device_attribute alarm_attr = {
+static struct device_attribute alarm_attr = {
        .attr = {.name = "alarm", .mode = 0644},
        .show = acpi_battery_alarm_show,
        .store = acpi_battery_alarm_store,
 };
 
+static struct attribute *acpi_battery_attrs[] = {
+       &alarm_attr.attr,
+       NULL
+};
+ATTRIBUTE_GROUPS(acpi_battery);
+
 /* --------------------------------------------------------------------------
                                  Driver Interface
    -------------------------------------------------------------------------- */
@@ -518,7 +523,10 @@ static int acpi_battery_read(struct acpi_battery *battery)
 static int acpi_battery_add(struct acpi_sbs *sbs, int id)
 {
        struct acpi_battery *battery = &sbs->battery[id];
-       struct power_supply_config psy_cfg = { .drv_data = battery, };
+       struct power_supply_config psy_cfg = {
+               .drv_data = battery,
+               .attr_grp = acpi_battery_groups,
+       };
        int result;
 
        battery->id = id;
@@ -548,10 +556,6 @@ static int acpi_battery_add(struct acpi_sbs *sbs, int id)
                goto end;
        }
 
-       result = device_create_file(&battery->bat->dev, &alarm_attr);
-       if (result)
-               goto end;
-       battery->have_sysfs_alarm = 1;
       end:
        pr_info("%s [%s]: Battery Slot [%s] (battery %s)\n",
               ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
@@ -563,11 +567,8 @@ static void acpi_battery_remove(struct acpi_sbs *sbs, int id)
 {
        struct acpi_battery *battery = &sbs->battery[id];
 
-       if (battery->bat) {
-               if (battery->have_sysfs_alarm)
-                       device_remove_file(&battery->bat->dev, &alarm_attr);
+       if (battery->bat)
                power_supply_unregister(battery->bat);
-       }
 }
 
 static int acpi_charger_add(struct acpi_sbs *sbs)