diff options
| -rw-r--r-- | drivers/cpufreq/cpufreq_stats.c | 44 |
1 files changed, 25 insertions, 19 deletions
diff --git a/drivers/cpufreq/cpufreq_stats.c b/drivers/cpufreq/cpufreq_stats.c index e1fe0a945639..5d7bf9b1dfc5 100644 --- a/drivers/cpufreq/cpufreq_stats.c +++ b/drivers/cpufreq/cpufreq_stats.c @@ -164,12 +164,13 @@ static void cpufreq_stats_free_table(unsigned int cpu) static int __cpufreq_stats_create_table(struct cpufreq_policy *policy) { - unsigned int i, count = 0, ret = 0; + unsigned int i = 0, count = 0, ret = -ENOMEM; struct cpufreq_stats *stats; unsigned int alloc_size; unsigned int cpu = policy->cpu; struct cpufreq_frequency_table *pos, *table; + /* We need cpufreq table for creating stats table */ table = cpufreq_frequency_get_table(cpu); if (unlikely(!table)) return 0; @@ -179,15 +180,10 @@ static int __cpufreq_stats_create_table(struct cpufreq_policy *policy) return -EEXIST; stats = kzalloc(sizeof(*stats), GFP_KERNEL); - if ((stats) == NULL) + if (!stats) return -ENOMEM; - ret = sysfs_create_group(&policy->kobj, &stats_attr_group); - if (ret) - goto error_out; - - policy->stats = stats; - + /* Find total allocation size */ cpufreq_for_each_valid_entry(pos, table) count++; @@ -196,32 +192,42 @@ static int __cpufreq_stats_create_table(struct cpufreq_policy *policy) #ifdef CONFIG_CPU_FREQ_STAT_DETAILS alloc_size += count * count * sizeof(int); #endif - stats->max_state = count; + + /* Allocate memory for time_in_state/freq_table/trans_table in one go */ stats->time_in_state = kzalloc(alloc_size, GFP_KERNEL); - if (!stats->time_in_state) { - ret = -ENOMEM; - goto error_alloc; - } + if (!stats->time_in_state) + goto free_stat; + stats->freq_table = (unsigned int *)(stats->time_in_state + count); #ifdef CONFIG_CPU_FREQ_STAT_DETAILS stats->trans_table = stats->freq_table + count; #endif - i = 0; + + stats->max_state = count; + + /* Find valid-unique entries */ cpufreq_for_each_valid_entry(pos, table) if (freq_table_get_index(stats, pos->frequency) == -1) stats->freq_table[i++] = pos->frequency; stats->state_num = i; + spin_lock(&cpufreq_stats_lock); stats->last_time = get_jiffies_64(); stats->last_index = freq_table_get_index(stats, policy->cur); spin_unlock(&cpufreq_stats_lock); - return 0; -error_alloc: - sysfs_remove_group(&policy->kobj, &stats_attr_group); -error_out: - kfree(stats); + + policy->stats = stats; + ret = sysfs_create_group(&policy->kobj, &stats_attr_group); + if (!ret) + return 0; + + /* We failed, release resources */ policy->stats = NULL; + kfree(stats->time_in_state); +free_stat: + kfree(stats); + return ret; } |