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Commit d3929b83 authored by Dirk Brandewie's avatar Dirk Brandewie Committed by Rafael J. Wysocki
Browse files

cpufreq / intel_pstate: Do not load on VM that does not report max P state. 

It seems some VMs support the P state MSRs but return zeros. Fail
gracefully if we are running in this environment.

References: https://bugzilla.redhat.com/show_bug.cgi?id=916833


Reported-by: default avatarJosh Boyer <jwboyer@redhat.com>
Signed-off-by: default avatarDirk Brandewie <dirk.j.brandewie@intel.com>
Acked-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 907cc908

drivers/cpufreq/intel_pstate.c

+3 −0
Original line number Original line Diff line number Diff line
@@ -662,6 +662,9 @@ static int intel_pstate_set_policy(struct cpufreq_policy *policy) 




	cpu = all_cpu_data[policy->cpu];

	cpu = all_cpu_data[policy->cpu];





	if (!policy->cpuinfo.max_freq)

		return -ENODEV;



	intel_pstate_get_min_max(cpu, &min, &max);

	intel_pstate_get_min_max(cpu, &min, &max);





	limits.min_perf_pct = (policy->min * 100) / policy->cpuinfo.max_freq;

	limits.min_perf_pct = (policy->min * 100) / policy->cpuinfo.max_freq;