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