From: Thomas Renninger <trenn@suse.de>
Date: Wed, 1 Feb 2006 10:38:37 +0000 (+0100)
Subject: [CPUFREQ] Check for not initialized freq on cpufreq changes
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=9d2725bb815d915fc6c8531097d9e71b579a8763;p=linux-beck.git

[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>
---

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);