PM / devfreq: Remove redundant governor_name from struct devfreq

The devfreq structure instance contains the governor_name and a governor
instance. When need to show the governor name, better to use the name
of devfreq_governor structure. So, governor_name variable in struct devfreq
is a redundant and unneeded variable. Remove the redundant governor_name
of struct devfreq and then use the name of devfreq_governor instance.

Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>

drivers/devfreq/devfreq.c

@@ -811,7 +811,6 @@ struct devfreq *devfreq_add_device(struct device *dev,
 	devfreq->dev.release = devfreq_dev_release;
 	INIT_LIST_HEAD(&devfreq->node);
 	devfreq->profile = profile;
-	strscpy(devfreq->governor_name, governor_name, DEVFREQ_NAME_LEN);
 	devfreq->previous_freq = profile->initial_freq;
 	devfreq->last_status.current_frequency = profile->initial_freq;
 	devfreq->data = data;
@@ -907,7 +906,7 @@ struct devfreq *devfreq_add_device(struct device *dev,
 
 	mutex_lock(&devfreq_list_lock);
 
-	governor = try_then_request_governor(devfreq->governor_name);
+	governor = try_then_request_governor(governor_name);
 	if (IS_ERR(governor)) {
 		dev_err(dev, "%s: Unable to find governor for the device\n",
 			__func__);
@@ -1249,7 +1248,7 @@ int devfreq_add_governor(struct devfreq_governor *governor)
 		int ret = 0;
 		struct device *dev = devfreq->dev.parent;
 
-		if (!strncmp(devfreq->governor_name, governor->name,
+		if (!strncmp(devfreq->governor->name, governor->name,
 			     DEVFREQ_NAME_LEN)) {
 			/* The following should never occur */
 			if (devfreq->governor) {
@@ -1311,7 +1310,7 @@ int devfreq_remove_governor(struct devfreq_governor *governor)
 		int ret;
 		struct device *dev = devfreq->dev.parent;
 
-		if (!strncmp(devfreq->governor_name, governor->name,
+		if (!strncmp(devfreq->governor->name, governor->name,
 			     DEVFREQ_NAME_LEN)) {
 			/* we should have a devfreq governor! */
 			if (!devfreq->governor) {
@@ -1406,7 +1405,6 @@ static ssize_t governor_store(struct device *dev, struct device_attribute *attr,
 	 */
 	prev_governor = df->governor;
 	df->governor = governor;
-	strncpy(df->governor_name, governor->name, DEVFREQ_NAME_LEN);
 	ret = df->governor->event_handler(df, DEVFREQ_GOV_START, NULL);
 	if (ret) {
 		dev_warn(dev, "%s: Governor %s not started(%d)\n",
@@ -1414,13 +1412,11 @@ static ssize_t governor_store(struct device *dev, struct device_attribute *attr,
 
 		/* Restore previous governor */
 		df->governor = prev_governor;
-		strncpy(df->governor_name, prev_governor->name,
-			DEVFREQ_NAME_LEN);
 		ret = df->governor->event_handler(df, DEVFREQ_GOV_START, NULL);
 		if (ret) {
 			dev_err(dev,
 				"%s: reverting to Governor %s failed (%d)\n",
-				__func__, df->governor_name, ret);
+				__func__, prev_governor->name, ret);
 			df->governor = NULL;
 			goto out;
 		}
@@ -1459,7 +1455,7 @@ static ssize_t available_governors_show(struct device *d,
 	 */
 	if (IS_SUPPORTED_FLAG(df->governor->flags, IMMUTABLE)) {
 		count = scnprintf(&buf[count], DEVFREQ_NAME_LEN,
-				  "%s ", df->governor_name);
+				  "%s ", df->governor->name);
 	/*
 	 * The devfreq device shows the registered governor except for
 	 * immutable governors such as passive governor .
@@ -1902,7 +1898,7 @@ static int devfreq_summary_show(struct seq_file *s, void *data)
 
 	list_for_each_entry_reverse(devfreq, &devfreq_list, node) {
 #if IS_ENABLED(CONFIG_DEVFREQ_GOV_PASSIVE)
-		if (!strncmp(devfreq->governor_name, DEVFREQ_GOV_PASSIVE,
+		if (!strncmp(devfreq->governor->name, DEVFREQ_GOV_PASSIVE,
 							DEVFREQ_NAME_LEN)) {
 			struct devfreq_passive_data *data = devfreq->data;
 
@@ -1928,7 +1924,7 @@ static int devfreq_summary_show(struct seq_file *s, void *data)
 			"%-30s %-30s %-15s %-10s %10d %12ld %12ld %12ld\n",
 			dev_name(&devfreq->dev),
 			p_devfreq ? dev_name(&p_devfreq->dev) : "null",
-			devfreq->governor_name,
+			devfreq->governor->name,
 			polling_ms ? timer_name[timer] : "null",
 			polling_ms,
 			cur_freq,

drivers/devfreq/governor.h

@@ -13,6 +13,8 @@
 
 #include <linux/devfreq.h>
 
+#define DEVFREQ_NAME_LEN			16
+
 #define to_devfreq(DEV)	container_of((DEV), struct devfreq, dev)
 
 /* Devfreq events */

include/linux/devfreq.h

@@ -15,8 +15,6 @@
 #include <linux/pm_opp.h>
 #include <linux/pm_qos.h>
 
-#define DEVFREQ_NAME_LEN 16
-
 /* DEVFREQ governor name */
 #define DEVFREQ_GOV_SIMPLE_ONDEMAND	"simple_ondemand"
 #define DEVFREQ_GOV_PERFORMANCE		"performance"
@@ -139,7 +137,6 @@ struct devfreq_stats {
  *		using devfreq.
  * @profile:	device-specific devfreq profile
  * @governor:	method how to choose frequency based on the usage.
- * @governor_name:	devfreq governor name for use with this devfreq
  * @nb:		notifier block used to notify devfreq object that it should
  *		reevaluate operable frequencies. Devfreq users may use
  *		devfreq.nb to the corresponding register notifier call chain.
@@ -176,7 +173,6 @@ struct devfreq {
 	struct device dev;
 	struct devfreq_dev_profile *profile;
 	const struct devfreq_governor *governor;
-	char governor_name[DEVFREQ_NAME_LEN];
 	struct notifier_block nb;
 	struct delayed_work work;