linux-kernel - [PATCH] ACPI: SBS: manage alarm sysfs attribute through psy core

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Date: Sun, 09 Jun 2024 13:13:28 +0200
From: Thomas Weißschuh <linux@...ssschuh.net>
To: "Rafael J. Wysocki" <rafael@...nel.org>, Len Brown <lenb@...nel.org>
Cc: linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Thomas Weißschuh <linux@...ssschuh.net>
Subject: [PATCH] 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@...ssschuh.net>
---
Only compile-tested.

This is the SBS equivalent of
"ACPI: battery: create alarm sysfs attribute atomically" [0]

[0] https://lore.kernel.org/lkml/20240609-acpi-battery-cleanup-v1-5-344517bdca73@weisss
---
 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 dc8164b182dc..442c5905d43b 100644
--- 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)

---
base-commit: 771ed66105de9106a6f3e4311e06451881cdac5e
change-id: 20240609-acpi-sbs-sysfs-group-50a30dc5f82a

Best regards,
-- 
Thomas Weißschuh <linux@...ssschuh.net>