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>

1 files changed, 14 insertions, 13 deletions

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index e3e666109e21..a5f1d016d473 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -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 (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 (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 (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);