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Commit 9d2725bb authored by Thomas Renninger's avatar Thomas Renninger Committed by Dave Jones
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[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: default avatarThomas Renninger <trenn@suse.de>
Signed-off-by: default avatarDave Jones <davej@redhat.com>
parent e4472cb3

arch/i386/kernel/timers/timer_tsc.c

+5 −0
Original line number Diff line number Diff line
@@ -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);