[CPUFREQ] Bug fix for acpi-cpufreq and cpufreq_stats oops on frequency change notific...

[powerpc.git] / drivers / cpufreq / cpufreq_stats.c

diff --git a/drivers/cpufreq/cpufreq_stats.c b/drivers/cpufreq/cpufreq_stats.c
index 6742b1a..91ad342 100644 (file)
--- 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