1 files changed, 38 insertions, 4 deletions

diff --git a/drivers/cpufreq/cpufreq_stats.c b/drivers/cpufreq/cpufreq_stats.c
index 741b6b191e6a..3597f25d5efa 100644
--- a/drivers/cpufreq/cpufreq_stats.c
+++ b/drivers/cpufreq/cpufreq_stats.c
@@ -19,6 +19,7 @@
 #include <linux/percpu.h>
 #include <linux/kobject.h>
 #include <linux/spinlock.h>
+#include <linux/notifier.h>
 #include <asm/cputime.h>
 
 static spinlock_t cpufreq_stats_lock;
@@ -298,6 +299,27 @@ cpufreq_stat_notifier_trans (struct notifier_block *nb, unsigned long val,
         return 0;
 }
 
+static int __cpuinit cpufreq_stat_cpu_callback(struct notifier_block *nfb,
+                                        unsigned long action, void *hcpu)
+{
+        unsigned int cpu = (unsigned long)hcpu;
+
+        switch (action) {
+        case CPU_ONLINE:
+                cpufreq_update_policy(cpu);
+                break;
+        case CPU_DEAD:
+                cpufreq_stats_free_table(cpu);
+                break;
+        }
+        return NOTIFY_OK;
+}
+
+static struct notifier_block cpufreq_stat_cpu_notifier =
+{
+        .notifier_call = cpufreq_stat_cpu_callback,
+};
+
 static struct notifier_block notifier_policy_block = {
         .notifier_call = cpufreq_stat_notifier_policy
 };
@@ -311,6 +333,7 @@ __init cpufreq_stats_init(void)
 {
         int ret;
         unsigned int cpu;
+
         spin_lock_init(&cpufreq_stats_lock);
         if ((ret = cpufreq_register_notifier(&notifier_policy_block,
                                 CPUFREQ_POLICY_NOTIFIER)))
@@ -323,20 +346,31 @@ __init cpufreq_stats_init(void)
                 return ret;
         }
 
-        for_each_cpu(cpu)
-                cpufreq_update_policy(cpu);
+        register_cpu_notifier(&cpufreq_stat_cpu_notifier);
+        lock_cpu_hotplug();
+        for_each_online_cpu(cpu) {
+                cpufreq_stat_cpu_callback(&cpufreq_stat_cpu_notifier, CPU_ONLINE,
+                        (void *)(long)cpu);
+        }
+        unlock_cpu_hotplug();
         return 0;
 }
 static void
 __exit cpufreq_stats_exit(void)
 {
         unsigned int cpu;
+
         cpufreq_unregister_notifier(&notifier_policy_block,
                         CPUFREQ_POLICY_NOTIFIER);
         cpufreq_unregister_notifier(&notifier_trans_block,
                         CPUFREQ_TRANSITION_NOTIFIER);
-        for_each_cpu(cpu)
-                cpufreq_stats_free_table(cpu);
+        unregister_cpu_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);
+        }
+        unlock_cpu_hotplug();
 }
 
 MODULE_AUTHOR ("Zou Nan hai <nanhai.zou@intel.com>");