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thermal: step_wise: cdev only needs update on a new target state

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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>
This commit is contained in:
Shawn Guo 2013-06-17 21:24:23 +08:00 committed by Zhang Rui
parent 044d5c26da
commit 178c2490b9
1 changed files with 3 additions and 0 deletions
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drivers/thermal/step_wise.c
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@ -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)