PM: domains: Return early if perf state is already set for the device

When dev_pm_genpd_set_performance_state() gets called to set a new performance state for the device, let's take a quicker path by doing an early return, if it turns out that the new state is already set for the device. Suggested-by: Viresh Kumar <[email protected]> Signed-off-by: Ulf Hansson <[email protected]> Signed-off-by: Rafael J. Wysocki <[email protected]>
mrcsosa · Jun 11, 2021 · d97fe10 · d97fe10
1 parent 0eef091
commit d97fe10
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
@@ -387,6 +387,9 @@ static int genpd_set_performance_state(struct device *dev, unsigned int state)
 	int ret;
 
 	prev_state = gpd_data->performance_state;
+	if (prev_state == state)
+		return 0;
+
 	gpd_data->performance_state = state;
 	state = _genpd_reeval_performance_state(genpd, state);