thermal: core: Introduce thermal_zone_device_exec()

Introduce a new helper function, thermal_zone_device_exec(), that can
be used by drivers to run a given callback routine under the zone lock.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index b38abe8..6b273e1 100644 (file)
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -497,6 +497,25 @@ void thermal_zone_device_update(struct thermal_zone_device *tz,
 }
 EXPORT_SYMBOL_GPL(thermal_zone_device_update);
 
+/**
+ * thermal_zone_device_exec - Run a callback under the zone lock.
+ * @tz: Thermal zone.
+ * @cb: Callback to run.
+ * @data: Data to pass to the callback.
+ */
+void thermal_zone_device_exec(struct thermal_zone_device *tz,
+                             void (*cb)(struct thermal_zone_device *,
+                                        unsigned long),
+                             unsigned long data)
+{
+       mutex_lock(&tz->lock);
+
+       cb(tz, data);
+
+       mutex_unlock(&tz->lock);
+}
+EXPORT_SYMBOL_GPL(thermal_zone_device_exec);
+
 static void thermal_zone_device_check(struct work_struct *work)
 {
        struct thermal_zone_device *tz = container_of(work, struct

diff --git a/include/linux/thermal.h b/include/linux/thermal.h
index 8783709..4d40bfa 100644 (file)
--- a/include/linux/thermal.h
+++ b/include/linux/thermal.h
@@ -323,6 +323,10 @@ int thermal_zone_unbind_cooling_device(struct thermal_zone_device *, int,
                                       struct thermal_cooling_device *);
 void thermal_zone_device_update(struct thermal_zone_device *,
                                enum thermal_notify_event);
+void thermal_zone_device_exec(struct thermal_zone_device *tz,
+                             void (*cb)(struct thermal_zone_device *,
+                                        unsigned long),
+                             unsigned long data);
 
 struct thermal_cooling_device *thermal_cooling_device_register(const char *,
                void *, const struct thermal_cooling_device_ops *);