thermal: sysfs: Reuse cdev->max_state

Now that the cooling device structure stores the max_state value, reuse
it and drop max_states from struct cooling_dev_stats.

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

Author: vireshk

drivers/thermal/thermal_sysfs.c

@@ -661,7 +661,6 @@ struct cooling_dev_stats {
 	spinlock_t lock;
 	unsigned int total_trans;
 	unsigned long state;
-	unsigned long max_states;
 	ktime_t last_time;
 	ktime_t *time_in_state;
 	unsigned int *trans_table;
@@ -691,7 +690,7 @@ void thermal_cooling_device_stats_update(struct thermal_cooling_device *cdev,
 		goto unlock;
 
 	update_time_in_state(stats);
-	stats->trans_table[stats->state * stats->max_states + new_state]++;
+	stats->trans_table[stats->state * (cdev->max_state + 1) + new_state]++;
 	stats->state = new_state;
 	stats->total_trans++;
 
@@ -725,7 +724,7 @@ time_in_state_ms_show(struct device *dev, struct device_attribute *attr,
 	spin_lock(&stats->lock);
 	update_time_in_state(stats);
 
-	for (i = 0; i < stats->max_states; i++) {
+	for (i = 0; i <= cdev->max_state; i++) {
 		len += sprintf(buf + len, "state%u\t%llu\n", i,
 			       ktime_to_ms(stats->time_in_state[i]));
 	}
@@ -740,7 +739,7 @@ reset_store(struct device *dev, struct device_attribute *attr, const char *buf,
 {
 	struct thermal_cooling_device *cdev = to_cooling_device(dev);
 	struct cooling_dev_stats *stats = cdev->stats;
-	int i, states = stats->max_states;
+	int i, states = cdev->max_state + 1;
 
 	spin_lock(&stats->lock);
 
@@ -749,7 +748,7 @@ reset_store(struct device *dev, struct device_attribute *attr, const char *buf,
 	memset(stats->trans_table, 0,
 	       states * states * sizeof(*stats->trans_table));
 
-	for (i = 0; i < stats->max_states; i++)
+	for (i = 0; i < states; i++)
 		stats->time_in_state[i] = ktime_set(0, 0);
 
 	spin_unlock(&stats->lock);
@@ -767,7 +766,7 @@ static ssize_t trans_table_show(struct device *dev,
 
 	len += snprintf(buf + len, PAGE_SIZE - len, " From  :    To\n");
 	len += snprintf(buf + len, PAGE_SIZE - len, "       : ");
-	for (i = 0; i < stats->max_states; i++) {
+	for (i = 0; i <= cdev->max_state; i++) {
 		if (len >= PAGE_SIZE)
 			break;
 		len += snprintf(buf + len, PAGE_SIZE - len, "state%2u  ", i);
@@ -777,17 +776,17 @@ static ssize_t trans_table_show(struct device *dev,
 
 	len += snprintf(buf + len, PAGE_SIZE - len, "\n");
 
-	for (i = 0; i < stats->max_states; i++) {
+	for (i = 0; i <= cdev->max_state; i++) {
 		if (len >= PAGE_SIZE)
 			break;
 
 		len += snprintf(buf + len, PAGE_SIZE - len, "state%2u:", i);
 
-		for (j = 0; j < stats->max_states; j++) {
+		for (j = 0; j <= cdev->max_state; j++) {
 			if (len >= PAGE_SIZE)
 				break;
 			len += snprintf(buf + len, PAGE_SIZE - len, "%8u ",
-				stats->trans_table[i * stats->max_states + j]);
+				stats->trans_table[i * (cdev->max_state + 1) + j]);
 		}
 		if (len >= PAGE_SIZE)
 			break;
@@ -823,14 +822,10 @@ static void cooling_device_stats_setup(struct thermal_cooling_device *cdev)
 {
 	const struct attribute_group *stats_attr_group = NULL;
 	struct cooling_dev_stats *stats;
-	unsigned long states;
+	/* Total number of states is highest state + 1 */
+	unsigned long states = cdev->max_state + 1;
 	int var;
 
-	if (cdev->ops->get_max_state(cdev, &states))
-		goto out;
-
-	states++; /* Total number of states is highest state + 1 */
-
 	var = sizeof(*stats);
 	var += sizeof(*stats->time_in_state) * states;
 	var += sizeof(*stats->trans_table) * states * states;
@@ -843,7 +838,6 @@ static void cooling_device_stats_setup(struct thermal_cooling_device *cdev)
 	stats->trans_table = (unsigned int *)(stats->time_in_state + states);
 	cdev->stats = stats;
 	stats->last_time = ktime_get();
-	stats->max_states = states;
 
 	spin_lock_init(&stats->lock);