From: Dirk Brandewie <dirk.brandewie@xxxxxxxxx> It seems some VMs support the P state MSRs but return zeros. Fail gracefully if we are running in this environment. https://bugzilla.redhat.com/show_bug.cgi?id=916833 Reported-by: jwboyer@xxxxxxxxxx Signed-off-by: Dirk Brandewie <dirk.j.brandewie@xxxxxxxxx> --- drivers/cpufreq/intel_pstate.c | 3 +++ 1 files changed, 3 insertions(+), 0 deletions(-) diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index 096fde0..2bfd083 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -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; -- 1.7.7.6 -- To unsubscribe from this list: send the line "unsubscribe cpufreq" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
