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Message-Id: <1362521727-20666-2-git-send-email-dirk.brandewie@gmail.com> Date: Tue, 5 Mar 2013 14:15:26 -0800 From: dirk.brandewie@...il.com To: linux-kernel@...r.kernel.org, cpufreq@...r.kernel.org Cc: konrad.wilk@...cle.com, jwboyer@...hat.com, Dirk Brandewie <dirk.brandewie@...il.com>, Dirk Brandewie <dirk.j.brandewie@...el.com> Subject: [PATCH 1/2] cpufreq/intel_pstate: Do not load on VM that do not report max P state. From: Dirk Brandewie <dirk.brandewie@...il.com> 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@...hat.com Signed-off-by: Dirk Brandewie <dirk.j.brandewie@...el.com> --- 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 linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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