thermal: step_wise: cdev only needs update on a new target state
authorShawn Guo <shawn.guo@linaro.org>
Mon, 17 Jun 2013 13:24:23 +0000 (21:24 +0800)
committerZhang Rui <rui.zhang@intel.com>
Thu, 15 Aug 2013 07:48:59 +0000 (15:48 +0800)
The cooling device only needs update on a new target state.  Since we
already check old target in thermal_zone_trip_update(), we can do one
more check to see if it's a new target state.  If not, we can reasonably
save some uncecesary code execution.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Eduardo Valentin <eduardo.valentin@ti.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
drivers/thermal/step_wise.c

index 4d4ddae1a99183cee9705f24e7acdc91cde62cc6..0afbd86e496213a535dc990091b17a28cecff1f6 100644 (file)
@@ -133,6 +133,9 @@ static void thermal_zone_trip_update(struct thermal_zone_device *tz, int trip)
                old_target = instance->target;
                instance->target = get_target_state(instance, trend, throttle);
 
+               if (old_target == instance->target)
+                       continue;
+
                /* Activate a passive thermal instance */
                if (old_target == THERMAL_NO_TARGET &&
                        instance->target != THERMAL_NO_TARGET)