linux-kernel - [PATCH] ACPI: battery: use driver core managed async probing

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Message-Id: <20240903-acpi-battery-async-v1-1-e4deb74fcdba@weissschuh.net>
Date: Tue, 03 Sep 2024 23:20:46 +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, 
 Arjan van de Ven <arjan@...ux.intel.com>, 
 Thomas Weißschuh <linux@...ssschuh.net>
Subject: [PATCH] ACPI: battery: use driver core managed async probing

In commit 0f66af530116 ("ACPI: battery: asynchronous init") the ACPI
battery driver switched to a custom async driver probing to avoid
delaying the system boot.
In the meantime the driver core gained its own async probing logic for
"slow devices which probing order is not essential for booting the system".
Switch over to the core logic and drop the custom one.

Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
---
 drivers/acpi/battery.c | 31 +++++++------------------------
 1 file changed, 7 insertions(+), 24 deletions(-)

diff --git a/drivers/acpi/battery.c b/drivers/acpi/battery.c
index da3a879d638a..de59a1e80557 100644
--- a/drivers/acpi/battery.c
+++ b/drivers/acpi/battery.c
@@ -10,7 +10,6 @@
 
 #define pr_fmt(fmt) "ACPI: battery: " fmt
 
-#include <linux/async.h>
 #include <linux/delay.h>
 #include <linux/dmi.h>
 #include <linux/jiffies.h>
@@ -50,8 +49,6 @@ MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@...e.de>");
 MODULE_DESCRIPTION("ACPI Battery Driver");
 MODULE_LICENSE("GPL");
 
-static async_cookie_t async_cookie;
-static bool battery_driver_registered;
 static int battery_bix_broken_package;
 static int battery_notification_delay_ms;
 static int battery_ac_is_broken;
@@ -1311,37 +1308,23 @@ static struct acpi_driver acpi_battery_driver = {
 		.remove = acpi_battery_remove,
 		},
 	.drv.pm = &acpi_battery_pm,
+	.drv.probe_type = PROBE_PREFER_ASYNCHRONOUS,
 };
 
-static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
-{
-	int result;
-
-	if (acpi_quirk_skip_acpi_ac_and_battery())
-		return;
-
-	dmi_check_system(bat_dmi_table);
-
-	result = acpi_bus_register_driver(&acpi_battery_driver);
-	battery_driver_registered = (result == 0);
-}
-
 static int __init acpi_battery_init(void)
 {
-	if (acpi_disabled)
+	if (acpi_disabled || acpi_quirk_skip_acpi_ac_and_battery())
 		return -ENODEV;
 
-	async_cookie = async_schedule(acpi_battery_init_async, NULL);
-	return 0;
+	dmi_check_system(bat_dmi_table);
+
+	return acpi_bus_register_driver(&acpi_battery_driver);
 }
 
 static void __exit acpi_battery_exit(void)
 {
-	async_synchronize_cookie(async_cookie + 1);
-	if (battery_driver_registered) {
-		acpi_bus_unregister_driver(&acpi_battery_driver);
-		battery_hook_exit();
-	}
+	acpi_bus_unregister_driver(&acpi_battery_driver);
+	battery_hook_exit();
 }
 
 module_init(acpi_battery_init);

---
base-commit: 67784a74e258a467225f0e68335df77acd67b7ab
change-id: 20240903-acpi-battery-async-a0d5260864e4

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