1 files changed, 12 insertions, 7 deletions

diff --git a/drivers/cpufreq/cpufreq_stats.c b/drivers/cpufreq/cpufreq_stats.c
index 1572129844a5..08b192eb22c6 100644
--- a/drivers/cpufreq/cpufreq_stats.c
+++ b/drivers/cpufreq/cpufreq_stats.c
@@ -14,7 +14,6 @@
 #include <linux/module.h>
 #include <linux/slab.h>
 
-static DEFINE_SPINLOCK(cpufreq_stats_lock);
 
 struct cpufreq_stats {
 	unsigned int total_trans;
@@ -23,6 +22,7 @@ struct cpufreq_stats {
 	unsigned int state_num;
 	unsigned int last_index;
 	u64 *time_in_state;
+	spinlock_t lock;
 	unsigned int *freq_table;
 	unsigned int *trans_table;
 };
@@ -31,26 +31,27 @@ static void cpufreq_stats_update(struct cpufreq_stats *stats)
 {
 	unsigned long long cur_time = get_jiffies_64();
 
-	spin_lock(&cpufreq_stats_lock);
 	stats->time_in_state[stats->last_index] += cur_time - stats->last_time;
 	stats->last_time = cur_time;
-	spin_unlock(&cpufreq_stats_lock);
 }
 
 static void cpufreq_stats_clear_table(struct cpufreq_stats *stats)
 {
 	unsigned int count = stats->max_state;
 
+	spin_lock(&stats->lock);
 	memset(stats->time_in_state, 0, count * sizeof(u64));
 	memset(stats->trans_table, 0, count * count * sizeof(int));
 	stats->last_time = get_jiffies_64();
 	stats->total_trans = 0;
+	spin_unlock(&stats->lock);
 }
 
 static ssize_t show_total_trans(struct cpufreq_policy *policy, char *buf)
 {
 	return sprintf(buf, "%d\n", policy->stats->total_trans);
 }
+cpufreq_freq_attr_ro(total_trans);
 
 static ssize_t show_time_in_state(struct cpufreq_policy *policy, char *buf)
 {
@@ -61,7 +62,10 @@ static ssize_t show_time_in_state(struct cpufreq_policy *policy, char *buf)
 	if (policy->fast_switch_enabled)
 		return 0;
 
+	spin_lock(&stats->lock);
 	cpufreq_stats_update(stats);
+	spin_unlock(&stats->lock);
+
 	for (i = 0; i < stats->state_num; i++) {
 		len += sprintf(buf + len, "%u %llu\n", stats->freq_table[i],
 			(unsigned long long)
@@ -69,6 +73,7 @@ static ssize_t show_time_in_state(struct cpufreq_policy *policy, char *buf)
 	}
 	return len;
 }
+cpufreq_freq_attr_ro(time_in_state);
 
 static ssize_t store_reset(struct cpufreq_policy *policy, const char *buf,
 			   size_t count)
@@ -77,6 +82,7 @@ static ssize_t store_reset(struct cpufreq_policy *policy, const char *buf,
 	cpufreq_stats_clear_table(policy->stats);
 	return count;
 }
+cpufreq_freq_attr_wo(reset);
 
 static ssize_t show_trans_table(struct cpufreq_policy *policy, char *buf)
 {
@@ -126,10 +132,6 @@ static ssize_t show_trans_table(struct cpufreq_policy *policy, char *buf)
 }
 cpufreq_freq_attr_ro(trans_table);
 
-cpufreq_freq_attr_ro(total_trans);
-cpufreq_freq_attr_ro(time_in_state);
-cpufreq_freq_attr_wo(reset);
-
 static struct attribute *default_attrs[] = {
 	&total_trans.attr,
 	&time_in_state.attr,
@@ -209,6 +211,7 @@ void cpufreq_stats_create_table(struct cpufreq_policy *policy)
 	stats->state_num = i;
 	stats->last_time = get_jiffies_64();
 	stats->last_index = freq_table_get_index(stats, policy->cur);
+	spin_lock_init(&stats->lock);
 
 	policy->stats = stats;
 	ret = sysfs_create_group(&policy->kobj, &stats_attr_group);
@@ -240,9 +243,11 @@ void cpufreq_stats_record_transition(struct cpufreq_policy *policy,
 	if (old_index == -1 || new_index == -1 || old_index == new_index)
 		return;
 
+	spin_lock(&stats->lock);
 	cpufreq_stats_update(stats);
 
 	stats->last_index = new_index;
 	stats->trans_table[old_index * stats->max_state + new_index]++;
 	stats->total_trans++;
+	spin_unlock(&stats->lock);
 }