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cpufreq: governor: Check transition latecy at init time only 

It is not necessary to check the governor's max_transition_latency
attribute every time cpufreq_governor() runs, so check it only if
the event argument is CPUFREQ_GOV_POLICY_INIT.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
This commit is contained in:
Rafael J. Wysocki 2016-05-14 01:00:28 +02:00
parent d6ff44d647
commit 9e8c0a899b
1 changed files with 13 additions and 12 deletions
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25
drivers/cpufreq/cpufreq.c
View File

@ -2011,23 +2011,24 @@ static int cpufreq_governor(struct cpufreq_policy *policy, unsigned int event)
if (!policy->governor)
return -EINVAL;
if (policy->governor->max_transition_latency &&
policy->cpuinfo.transition_latency >
policy->governor->max_transition_latency) {
struct cpufreq_governor *gov = cpufreq_fallback_governor();
if (event == CPUFREQ_GOV_POLICY_INIT) {
if (policy->governor->max_transition_latency &&
policy->cpuinfo.transition_latency >
policy->governor->max_transition_latency) {
struct cpufreq_governor *gov = cpufreq_fallback_governor();
if (gov) {
pr_warn("%s governor failed, too long transition latency of HW, fallback to %s governor\n",
policy->governor->name, gov->name);
policy->governor = gov;
} else {
return -EINVAL;
if (gov) {
pr_warn("%s governor failed, too long transition latency of HW, fallback to %s governor\n",
policy->governor->name, gov->name);
policy->governor = gov;
} else {
return -EINVAL;
}
}
}
if (event == CPUFREQ_GOV_POLICY_INIT)
if (!try_module_get(policy->governor->owner))
return -EINVAL;
}
pr_debug("%s: for CPU %u, event %u\n", __func__, policy->cpu, event);