Merge branch 'core-iommu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...

[pandora-kernel.git] / drivers / cpufreq / cpufreq_stats.c

diff --git a/drivers/cpufreq/cpufreq_stats.c b/drivers/cpufreq/cpufreq_stats.c
index 00d73fc..b60a4c2 100644 (file)
--- a/drivers/cpufreq/cpufreq_stats.c
+++ b/drivers/cpufreq/cpufreq_stats.c
@@ -165,17 +165,27 @@ static int freq_table_get_index(struct cpufreq_stats *stat, unsigned int freq)
        return -1;
 }
 
+/* should be called late in the CPU removal sequence so that the stats
+ * memory is still available in case someone tries to use it.
+ */
 static void cpufreq_stats_free_table(unsigned int cpu)
 {
        struct cpufreq_stats *stat = per_cpu(cpufreq_stats_table, cpu);
-       struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
-       if (policy && policy->cpu == cpu)
-               sysfs_remove_group(&policy->kobj, &stats_attr_group);
        if (stat) {
                kfree(stat->time_in_state);
                kfree(stat);
        }
        per_cpu(cpufreq_stats_table, cpu) = NULL;
+}
+
+/* must be called early in the CPU removal sequence (before
+ * cpufreq_remove_dev) so that policy is still valid.
+ */
+static void cpufreq_stats_free_sysfs(unsigned int cpu)
+{
+       struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
+       if (policy && policy->cpu == cpu)
+               sysfs_remove_group(&policy->kobj, &stats_attr_group);
        if (policy)
                cpufreq_cpu_put(policy);
 }
@@ -316,6 +326,9 @@ static int __cpuinit cpufreq_stat_cpu_callback(struct notifier_block *nfb,
        case CPU_ONLINE_FROZEN:
                cpufreq_update_policy(cpu);
                break;
+       case CPU_DOWN_PREPARE:
+               cpufreq_stats_free_sysfs(cpu);
+               break;
        case CPU_DEAD:
        case CPU_DEAD_FROZEN:
                cpufreq_stats_free_table(cpu);
@@ -324,9 +337,10 @@ static int __cpuinit cpufreq_stat_cpu_callback(struct notifier_block *nfb,
        return NOTIFY_OK;
 }
 
-static struct notifier_block cpufreq_stat_cpu_notifier __refdata =
-{
+/* priority=1 so this will get called before cpufreq_remove_dev */
+static struct notifier_block cpufreq_stat_cpu_notifier __refdata = {
        .notifier_call = cpufreq_stat_cpu_callback,
+       .priority = 1,
 };
 
 static struct notifier_block notifier_policy_block = {