[CPUFREQ] Check for not initialized freq on cpufreq changes

Test for old_freq equals 0 to insure not to divide by 0:
______________________________________________

Check for not initialized freq on cpufreq changes

Signed-off-by: Thomas Renninger <trenn@suse.de>
Signed-off-by: Dave Jones <davej@redhat.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/arch/i386/kernel/timers/timer_tsc.c b/arch/i386/kernel/timers/timer_tsc.c
index 47675bbbb316..591a642af884 100644
--- a/arch/i386/kernel/timers/timer_tsc.c
+++ b/arch/i386/kernel/timers/timer_tsc.c
@@ -272,6 +272,10 @@ time_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
         if (val != CPUFREQ_RESUMECHANGE)
                 write_seqlock_irq(&xtime_lock);
         if (!ref_freq) {
+                if (!freq->old){
+                        ref_freq = freq->new;
+                        goto end;
+                }
                 ref_freq = freq->old;
                 loops_per_jiffy_ref = cpu_data[freq->cpu].loops_per_jiffy;
 #ifndef CONFIG_SMP
@@ -297,6 +301,7 @@ time_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
 #endif
         }
 
+end:
         if (val != CPUFREQ_RESUMECHANGE)
                 write_sequnlock_irq(&xtime_lock);