cpufreq: governor: Symmetrize cpu_dbs_info initialization and cleanup

Make the initialization of struct cpu_dbs_info objects in
alloc_policy_dbs_info() and the code that cleans them up in
free_policy_dbs_info() more symmetrical.  In particular,
set/clear the update_util.func field in those functions along
with the policy_dbs field.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>

drivers/cpufreq/cpufreq_governor.c

@@ -304,14 +304,18 @@ static struct policy_dbs_info *alloc_policy_dbs_info(struct cpufreq_policy *poli
 	if (!policy_dbs)
 		return NULL;
 
-	/* Set policy_dbs for all CPUs, online+offline */
-	for_each_cpu(j, policy->related_cpus)
-		gov->get_cpu_cdbs(j)->policy_dbs = policy_dbs;
-
 	mutex_init(&policy_dbs->timer_mutex);
 	atomic_set(&policy_dbs->skip_work, 0);
 	init_irq_work(&policy_dbs->irq_work, dbs_irq_work);
 	INIT_WORK(&policy_dbs->work, dbs_work_handler);
+
+	/* Set policy_dbs for all CPUs, online+offline */
+	for_each_cpu(j, policy->related_cpus) {
+		struct cpu_dbs_info *j_cdbs = gov->get_cpu_cdbs(j);
+
+		j_cdbs->policy_dbs = policy_dbs;
+		j_cdbs->update_util.func = dbs_update_util_handler;
+	}
 	return policy_dbs;
 }
 
@@ -324,9 +328,12 @@ static void free_policy_dbs_info(struct cpufreq_policy *policy,
 
 	mutex_destroy(&policy_dbs->timer_mutex);
 
-	for_each_cpu(j, policy->cpus)
-		gov->get_cpu_cdbs(j)->policy_dbs = NULL;
+	for_each_cpu(j, policy->related_cpus) {
+		struct cpu_dbs_info *j_cdbs = gov->get_cpu_cdbs(j);
 
+		j_cdbs->policy_dbs = NULL;
+		j_cdbs->update_util.func = NULL;
+	}
 	kfree(policy_dbs);
 }
 
@@ -477,8 +484,6 @@ static int cpufreq_governor_start(struct cpufreq_policy *policy)
 
 		if (ignore_nice)
 			j_cdbs->prev_cpu_nice = kcpustat_cpu(j).cpustat[CPUTIME_NICE];
-
-		j_cdbs->update_util.func = dbs_update_util_handler;
 	}
 	policy_dbs->policy = policy;