cpufreq: governor: Rework cpufreq_governor_dbs()

Since it is possible to obtain a pointer to struct dbs_governor
from a pointer to the struct governor embedded in it via
container_of(), the second argument of cpufreq_governor_init()
is not necessary.  Accordingly, cpufreq_governor_dbs() doesn't
need its second argument either and the ->governor callbacks
for both the ondemand and conservative governors may be set
to cpufreq_governor_dbs() directly.  Make that happen.

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

drivers/cpufreq/cpufreq_conservative.c

@@ -325,13 +325,10 @@ static void cs_exit(struct dbs_data *dbs_data, bool notify)
 
 define_get_cpu_dbs_routines(cs_cpu_dbs_info);
 
-static int cs_cpufreq_governor_dbs(struct cpufreq_policy *policy,
-				   unsigned int event);
-
 static struct dbs_governor cs_dbs_gov = {
 	.gov = {
 		.name = "conservative",
-		.governor = cs_cpufreq_governor_dbs,
+		.governor = cpufreq_governor_dbs,
 		.max_transition_latency = TRANSITION_LATENCY_LIMIT,
 		.owner = THIS_MODULE,
 	},
@@ -348,12 +345,6 @@ static struct dbs_governor cs_dbs_gov = {
 
 #define CPU_FREQ_GOV_CONSERVATIVE	(&cs_dbs_gov.gov)
 
-static int cs_cpufreq_governor_dbs(struct cpufreq_policy *policy,
-				   unsigned int event)
-{
-	return cpufreq_governor_dbs(policy, &cs_dbs_gov, event);
-}
-
 static int dbs_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
 				void *data)
 {

drivers/cpufreq/cpufreq_governor.c

@@ -328,9 +328,10 @@ static void free_common_dbs_info(struct cpufreq_policy *policy,
 	kfree(shared);
 }
 
-static int cpufreq_governor_init(struct cpufreq_policy *policy,
-				 struct dbs_governor *gov)
+static int cpufreq_governor_init(struct cpufreq_policy *policy)
 {
+	struct dbs_governor *gov = container_of(policy->governor,
+						struct dbs_governor, gov);
 	struct dbs_data *dbs_data = gov->gdbs_data;
 	unsigned int latency;
 	int ret;
@@ -539,8 +540,7 @@ static int cpufreq_governor_limits(struct cpufreq_policy *policy)
 	return 0;
 }
 
-int cpufreq_governor_dbs(struct cpufreq_policy *policy,
-			 struct dbs_governor *gov, unsigned int event)
+int cpufreq_governor_dbs(struct cpufreq_policy *policy, unsigned int event)
 {
 	int ret = -EINVAL;
 
@@ -548,7 +548,7 @@ int cpufreq_governor_dbs(struct cpufreq_policy *policy,
 	mutex_lock(&dbs_data_mutex);
 
 	if (event == CPUFREQ_GOV_POLICY_INIT) {
-		ret = cpufreq_governor_init(policy, gov);
+		ret = cpufreq_governor_init(policy);
 	} else if (policy->governor_data) {
 		switch (event) {
 		case CPUFREQ_GOV_POLICY_EXIT:

drivers/cpufreq/cpufreq_governor.h

@@ -276,8 +276,7 @@ static ssize_t show_sampling_rate_min_gov_pol				\
 extern struct mutex dbs_data_mutex;
 extern struct mutex cpufreq_governor_lock;
 void dbs_check_cpu(struct dbs_data *dbs_data, int cpu);
-int cpufreq_governor_dbs(struct cpufreq_policy *policy,
-		struct dbs_governor *gov, unsigned int event);
+int cpufreq_governor_dbs(struct cpufreq_policy *policy, unsigned int event);
 void od_register_powersave_bias_handler(unsigned int (*f)
 		(struct cpufreq_policy *, unsigned int, unsigned int),
 		unsigned int powersave_bias);

drivers/cpufreq/cpufreq_ondemand.c

@@ -539,13 +539,10 @@ static struct od_ops od_ops = {
 	.freq_increase = dbs_freq_increase,
 };
 
-static int od_cpufreq_governor_dbs(struct cpufreq_policy *policy,
-				   unsigned int event);
-
 static struct dbs_governor od_dbs_gov = {
 	.gov = {
 		.name = "ondemand",
-		.governor = od_cpufreq_governor_dbs,
+		.governor = cpufreq_governor_dbs,
 		.max_transition_latency	= TRANSITION_LATENCY_LIMIT,
 		.owner = THIS_MODULE,
 	},
@@ -563,12 +560,6 @@ static struct dbs_governor od_dbs_gov = {
 
 #define CPU_FREQ_GOV_ONDEMAND	(&od_dbs_gov.gov)
 
-static int od_cpufreq_governor_dbs(struct cpufreq_policy *policy,
-		unsigned int event)
-{
-	return cpufreq_governor_dbs(policy, &od_dbs_gov, event);
-}
-
 static void od_set_powersave_bias(unsigned int powersave_bias)
 {
 	struct cpufreq_policy *policy;