cpufreq: Introduce cpufreq_start_governor()

Starting a governor in cpufreq always follows the same pattern
involving two calls to cpufreq_governor(), one with the event
argument set to CPUFREQ_GOV_START and one with that argument set to
CPUFREQ_GOV_LIMITS.

Introduce cpufreq_start_governor() that will carry out those two
operations and make all places where governors are started use it.

That slightly modifies the behavior of cpufreq_set_policy() which
now also will go back to the old governor if the second call to
cpufreq_governor() (the one with event equal to CPUFREQ_GOV_LIMITS)
fails, but that really is how it should work in the first place.

Also cpufreq_resume() will now pring an error message if the
CPUFREQ_GOV_LIMITS call to cpufreq_governor() fails, but that
makes it follow cpufreq_add_policy_cpu() and cpufreq_offline()
in that respect.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index f870399..43f3912 100644 (file)
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -76,6 +76,7 @@ static inline bool has_target(void)
 /* internal prototypes */
 static int cpufreq_governor(struct cpufreq_policy *policy, unsigned int event);
 static unsigned int __cpufreq_get(struct cpufreq_policy *policy);
+static int cpufreq_start_governor(struct cpufreq_policy *policy);
 
 /**
  * Two notifier lists: the "policy" list is involved in the
@@ -964,10 +965,7 @@ static int cpufreq_add_policy_cpu(struct cpufreq_policy *policy, unsigned int cp
        cpumask_set_cpu(cpu, policy->cpus);
 
        if (has_target()) {
-               ret = cpufreq_governor(policy, CPUFREQ_GOV_START);
-               if (!ret)
-                       ret = cpufreq_governor(policy, CPUFREQ_GOV_LIMITS);
-
+               ret = cpufreq_start_governor(policy);
                if (ret)
                        pr_err("%s: Failed to start governor\n", __func__);
        }
@@ -1308,10 +1306,7 @@ static void cpufreq_offline(unsigned int cpu)
        /* Start governor again for active policy */
        if (!policy_is_inactive(policy)) {
                if (has_target()) {
-                       ret = cpufreq_governor(policy, CPUFREQ_GOV_START);
-                       if (!ret)
-                               ret = cpufreq_governor(policy, CPUFREQ_GOV_LIMITS);
-
+                       ret = cpufreq_start_governor(policy);
                        if (ret)
                                pr_err("%s: Failed to start governor\n", __func__);
                }
@@ -1591,9 +1586,7 @@ void cpufreq_resume(void)
                                policy);
                } else {
                        down_write(&policy->rwsem);
-                       ret = cpufreq_governor(policy, CPUFREQ_GOV_START);
-                       if (!ret)
-                               cpufreq_governor(policy, CPUFREQ_GOV_LIMITS);
+                       ret = cpufreq_start_governor(policy);
                        up_write(&policy->rwsem);
 
                        if (ret)
@@ -1935,6 +1928,14 @@ static int cpufreq_governor(struct cpufreq_policy *policy, unsigned int event)
        return ret;
 }
 
+static int cpufreq_start_governor(struct cpufreq_policy *policy)
+{
+       int ret;
+
+       ret = cpufreq_governor(policy, CPUFREQ_GOV_START);
+       return ret ? ret : cpufreq_governor(policy, CPUFREQ_GOV_LIMITS);
+}
+
 int cpufreq_register_governor(struct cpufreq_governor *governor)
 {
        int err;
@@ -2071,8 +2072,10 @@ static int cpufreq_set_policy(struct cpufreq_policy *policy,
                return cpufreq_driver->setpolicy(new_policy);
        }
 
-       if (new_policy->governor == policy->governor)
-               goto out;
+       if (new_policy->governor == policy->governor) {
+               pr_debug("cpufreq: governor limits update\n");
+               return cpufreq_governor(policy, CPUFREQ_GOV_LIMITS);
+       }
 
        pr_debug("governor switch\n");
 
@@ -2100,10 +2103,11 @@ static int cpufreq_set_policy(struct cpufreq_policy *policy,
        policy->governor = new_policy->governor;
        ret = cpufreq_governor(policy, CPUFREQ_GOV_POLICY_INIT);
        if (!ret) {
-               ret = cpufreq_governor(policy, CPUFREQ_GOV_START);
-               if (!ret)
-                       goto out;
-
+               ret = cpufreq_start_governor(policy);
+               if (!ret) {
+                       pr_debug("cpufreq: governor change\n");
+                       return 0;
+               }
                cpufreq_governor(policy, CPUFREQ_GOV_POLICY_EXIT);
        }
 
@@ -2114,14 +2118,10 @@ static int cpufreq_set_policy(struct cpufreq_policy *policy,
                if (cpufreq_governor(policy, CPUFREQ_GOV_POLICY_INIT))
                        policy->governor = NULL;
                else
-                       cpufreq_governor(policy, CPUFREQ_GOV_START);
+                       cpufreq_start_governor(policy);
        }
 
        return ret;
-
- out:
-       pr_debug("governor: change or update limits\n");
-       return cpufreq_governor(policy, CPUFREQ_GOV_LIMITS);
 }
 
 /**