ACPI / battery: ensure acpi_battery_init() has finish

Make sure that async function scheduled with async_schedule() has already
been executed.

Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/acpi/battery.c b/drivers/acpi/battery.c
index 9c676a6f32ce..547e627611e0 100644
--- a/drivers/acpi/battery.c
+++ b/drivers/acpi/battery.c
@@ -70,6 +70,7 @@ MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
 MODULE_DESCRIPTION("ACPI Battery Driver");
 MODULE_LICENSE("GPL");
 
+static async_cookie_t async_cookie;
 static int battery_bix_broken_package;
 static int battery_notification_delay_ms;
 static unsigned int cache_time = 1000;
@@ -1313,12 +1314,13 @@ static int __init acpi_battery_init(void)
         if (acpi_disabled)
                 return -ENODEV;
 
-        async_schedule(acpi_battery_init_async, NULL);
+        async_cookie = async_schedule(acpi_battery_init_async, NULL);
         return 0;
 }
 
 static void __exit acpi_battery_exit(void)
 {
+        async_synchronize_cookie(async_cookie);
         acpi_bus_unregister_driver(&acpi_battery_driver);
 #ifdef CONFIG_ACPI_PROCFS_POWER
         acpi_unlock_battery_dir(acpi_battery_dir);