ACPI / thermal: Remove the unused lock of struct acpi_thermal

The acpi_thermal->lock now just is initialized when a thermal zone
device is added and destroyed when the thermal zone is removed.
It is never used in any other places, so remove it.

Signed-off-by: Lan Tianyu <tianyu.lan@intel.com>
Acked-by: Zhang Rui <rui.zhang@intel.com>
Acked-by: Durgadoss R <durgadoss.r@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 0 insertions, 4 deletions

diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c
index 547a906a7662..dc1ba6c9ef5d 100644
--- a/drivers/acpi/thermal.c
+++ b/drivers/acpi/thermal.c
@@ -190,7 +190,6 @@ struct acpi_thermal {
         struct thermal_zone_device *thermal_zone;
         int tz_enabled;
         int kelvin_offset;
-        struct mutex lock;
 };
 
 /* --------------------------------------------------------------------------
@@ -1098,8 +1097,6 @@ static int acpi_thermal_add(struct acpi_device *device)
         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
         device->driver_data = tz;
-        mutex_init(&tz->lock);
-
 
         result = acpi_thermal_get_info(tz);
         if (result)
@@ -1132,7 +1129,6 @@ static int acpi_thermal_remove(struct acpi_device *device)
         tz = acpi_driver_data(device);
 
         acpi_thermal_unregister_thermal_zone(tz);
-        mutex_destroy(&tz->lock);
         kfree(tz);
         return 0;
 }