cpufreq: governor: CPUFREQ_GOV_POLICY_EXIT never fails

None of the cpufreq governors currently in the tree will ever fail
an invocation of the ->governor() callback with the event argument
equal to CPUFREQ_GOV_POLICY_EXIT (unless invoked with incorrect
arguments which doesn't matter anyway) and it wouldn't really
make sense to fail it, because the caller won't be able to handle
that failure in a meaningful way.

Accordingly, rearrange the code in the core to make it clear that
this call never fails.

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 035513b012eebf049cffbe713680c556993f944f..74ab6f79145bd4aeebbdffa1cd405ea860d62e27 100644 (file)
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -78,9 +78,9 @@ 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);
 
-static inline int cpufreq_exit_governor(struct cpufreq_policy *policy)
+static inline void cpufreq_exit_governor(struct cpufreq_policy *policy)
 {
-       return cpufreq_governor(policy, CPUFREQ_GOV_POLICY_EXIT);
+       (void)cpufreq_governor(policy, CPUFREQ_GOV_POLICY_EXIT);
 }
 
 /**
@@ -1387,12 +1387,8 @@ static void cpufreq_offline(unsigned int cpu)
        if (cpufreq_driver->stop_cpu)
                cpufreq_driver->stop_cpu(policy);
 
-       /* If cpu is last user of policy, free policy */
-       if (has_target()) {
-               ret = cpufreq_exit_governor(policy);
-               if (ret)
-                       pr_err("%s: Failed to exit governor\n", __func__);
-       }
+       if (has_target())
+               cpufreq_exit_governor(policy);
 
        /*
         * Perform the ->exit() even during light-weight tear-down,
@@ -2049,16 +2045,15 @@ static int cpufreq_governor(struct cpufreq_policy *policy, unsigned int event)
 
        ret = policy->governor->governor(policy, event);
 
-       if (!ret) {
-               if (event == CPUFREQ_GOV_POLICY_INIT)
+       if (event == CPUFREQ_GOV_POLICY_INIT) {
+               if (ret)
+                       module_put(policy->governor->owner);
+               else
                        policy->governor->initialized++;
-               else if (event == CPUFREQ_GOV_POLICY_EXIT)
-                       policy->governor->initialized--;
-       }
-
-       if (((event == CPUFREQ_GOV_POLICY_INIT) && ret) ||
-                       ((event == CPUFREQ_GOV_POLICY_EXIT) && !ret))
+       } else if (event == CPUFREQ_GOV_POLICY_EXIT) {
+               policy->governor->initialized--;
                module_put(policy->governor->owner);
+       }
 
        return ret;
 }
@@ -2228,13 +2223,7 @@ static int cpufreq_set_policy(struct cpufreq_policy *policy,
                                 __func__, old_gov->name, ret);
                        return ret;
                }
-
-               ret = cpufreq_exit_governor(policy);
-               if (ret) {
-                       pr_err("%s: Failed to Exit Governor: %s (%d)\n",
-                              __func__, old_gov->name, ret);
-                       return ret;
-               }
+               cpufreq_exit_governor(policy);
        }
 
        /* start new governor */