5.4-stable review patch. If anyone has any objections, please let me know.
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From: Thomas Weißschuh linux@weissschuh.net
[ Upstream commit 6bad28cfc30988a845fb3f59a99f4b8a4ce8fe95 ]
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 Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/acpi/sbs.c | 23 ++++++++++++----------- 1 file changed, 12 insertions(+), 11 deletions(-)
diff --git a/drivers/acpi/sbs.c b/drivers/acpi/sbs.c index 6e88224f60f09..4aa55d8d43859 100644 --- a/drivers/acpi/sbs.c +++ b/drivers/acpi/sbs.c @@ -80,7 +80,6 @@ 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) @@ -465,12 +464,18 @@ 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 -------------------------------------------------------------------------- */ @@ -512,7 +517,10 @@ 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; @@ -542,10 +550,6 @@ 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: printk(KERN_INFO PREFIX "%s [%s]: Battery Slot [%s] (battery %s)\n", ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device), @@ -557,11 +561,8 @@ 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)