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

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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: Josh Boyer <jwboyer@redhat.com>
Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Dirk Brandewie 2013-03-05 14:15:26 -08:00 committed by Rafael J. Wysocki
parent 907cc90810
commit d3929b8328
1 changed files with 3 additions and 0 deletions
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3
drivers/cpufreq/intel_pstate.c
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@ -662,6 +662,9 @@ static int intel_pstate_set_policy(struct cpufreq_policy *policy)
cpu = all_cpu_data[policy->cpu];
if (!policy->cpuinfo.max_freq)
return -ENODEV;
intel_pstate_get_min_max(cpu, &min, &max);
limits.min_perf_pct = (policy->min * 100) / policy->cpuinfo.max_freq;