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| author | Dirk Brandewie <dirk.brandewie@gmail.com> | 2013-03-05 14:15:26 -0800 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2013-03-06 23:40:11 +0100 |
| commit | d3929b832833db870af72479666fa4e4d043e02e (patch) | |
| tree | 69f897201f80becc05d9a13b3a53a198b96b3ec4 /drivers/cpufreq/intel_pstate.c | |
| parent | 907cc908108b16ae87b7165be992511c968159f0 (diff) | |
| download | lwn-d3929b832833db870af72479666fa4e4d043e02e.tar.gz lwn-d3929b832833db870af72479666fa4e4d043e02e.zip | |
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: 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>
Diffstat (limited to 'drivers/cpufreq/intel_pstate.c')
| -rw-r--r-- | 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 46a23b65dfc8..f6dd1e761129 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; |