diff options
Diffstat (limited to 'drivers/cpufreq/cpufreq_stats.c')
| -rw-r--r-- | drivers/cpufreq/cpufreq_stats.c | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/drivers/cpufreq/cpufreq_stats.c b/drivers/cpufreq/cpufreq_stats.c index c2ecc599dc5..91ad342a605 100644 --- a/drivers/cpufreq/cpufreq_stats.c +++ b/drivers/cpufreq/cpufreq_stats.c @@ -285,6 +285,7 @@ cpufreq_stat_notifier_trans (struct notifier_block *nb, unsigned long val, stat = cpufreq_stats_table[freq->cpu]; if (!stat) return 0; + old_index = freq_table_get_index(stat, freq->old); new_index = freq_table_get_index(stat, freq->new); @@ -292,6 +293,9 @@ cpufreq_stat_notifier_trans (struct notifier_block *nb, unsigned long val, if (old_index == new_index) return 0; + if (old_index == -1 || new_index == -1) + return 0; + spin_lock(&cpufreq_stats_lock); stat->last_index = new_index; #ifdef CONFIG_CPU_FREQ_STAT_DETAILS @@ -351,8 +355,8 @@ __init cpufreq_stats_init(void) register_hotcpu_notifier(&cpufreq_stat_cpu_notifier); for_each_online_cpu(cpu) { - cpufreq_stat_cpu_callback(&cpufreq_stat_cpu_notifier, CPU_ONLINE, - (void *)(long)cpu); + cpufreq_stat_cpu_callback(&cpufreq_stat_cpu_notifier, + CPU_ONLINE, (void *)(long)cpu); } return 0; } @@ -368,14 +372,15 @@ __exit cpufreq_stats_exit(void) unregister_hotcpu_notifier(&cpufreq_stat_cpu_notifier); lock_cpu_hotplug(); for_each_online_cpu(cpu) { - cpufreq_stat_cpu_callback(&cpufreq_stat_cpu_notifier, CPU_DEAD, - (void *)(long)cpu); + cpufreq_stat_cpu_callback(&cpufreq_stat_cpu_notifier, + CPU_DEAD, (void *)(long)cpu); } unlock_cpu_hotplug(); } MODULE_AUTHOR ("Zou Nan hai <nanhai.zou@intel.com>"); -MODULE_DESCRIPTION ("'cpufreq_stats' - A driver to export cpufreq stats through sysfs filesystem"); +MODULE_DESCRIPTION ("'cpufreq_stats' - A driver to export cpufreq stats" + "through sysfs filesystem"); MODULE_LICENSE ("GPL"); module_init(cpufreq_stats_init); |