[PATCH v2 2/4] PM: domains: Return early if perf state is already set for the device
From: Ulf Hansson <hidden>
Date: 2021-06-03 09:35:52
Also in:
lkml
Subsystem:
driver core, kobjects, debugfs and sysfs, hibernation (aka software suspend, aka swsusp), power management core, suspend to ram, the rest · Maintainers:
Greg Kroah-Hartman, "Rafael J. Wysocki", Danilo Krummrich, Linus Torvalds
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 <viresh.kumar@linaro.org> Signed-off-by: Ulf Hansson <redacted> --- Changes in v2: - New patch. --- drivers/base/power/domain.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 5c476ed1c6c9..ef25a5b18587 100644
--- 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);
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2.25.1