[PATCH] cpufreq: Avoid calling cpufreq driver's target() routine if target_freq == policy->cur
From: Rafael J. Wysocki <hidden>
Date: 2012-10-26 11:13:18
Also in:
linux-pm, lkml
On Friday, October 26, 2012 03:06:26 PM Viresh Kumar wrote:
Avoid calling cpufreq driver's target() routine if new frequency is same as policies current frequency. Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Looks reasonable. Any objection from anyone? Rafael
quoted hunk ↗ jump to hunk
--- drivers/cpufreq/cpufreq.c | 4 ++++ 1 file changed, 4 insertions(+)diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 261ef65..28dc134 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c@@ -1476,6 +1476,10 @@ int __cpufreq_driver_target(struct cpufreq_policy *policy, pr_debug("target for CPU %u: %u kHz, relation %u\n", policy->cpu, target_freq, relation); + + if (target_freq == policy->cur) + return 0; + if (cpu_online(policy->cpu) && cpufreq_driver->target) retval = cpufreq_driver->target(policy, target_freq, relation);
-- I speak only for myself. Rafael J. Wysocki, Intel Open Source Technology Center.