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[CPUFREQ] Check for not initialized freq on cpufreq changes

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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>
This commit is contained in:
Thomas Renninger 2006-02-01 11:38:37 +01:00 committed by Dave Jones
parent e4472cb370
commit 9d2725bb81
1 changed files with 5 additions and 0 deletions
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5
arch/i386/kernel/timers/timer_tsc.c
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@ -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);