From d74b19929130c9b5395a497030dcf161353cd526 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Wed, 1 Mar 2017 00:11:05 +0100 Subject: [PATCH] cpufreq: intel_pstate: Fix intel_pstate_verify_policy() The code added to intel_pstate_verify_policy() by commit 1443ebbacfd7 (cpufreq: intel_pstate: Fix sysfs limits enforcement for performance policy) should use perf_limits instead of limits, because otherwise setting global limits via sysfs may affect policies inconsistently. For example, in the sequence of shell commands below, the scaling_min_freq attribute for policy1 and policy2 should be affected in the same way, because scaling_governor is set in the same way for both of them: # cat cpufreq/policy1/scaling_governor powersave # cat cpufreq/policy2/scaling_governor powersave # echo performance > cpufreq/policy0/scaling_governor # echo 94 > intel_pstate/min_perf_pct # cat cpufreq/policy0/scaling_min_freq 2914000 # cat cpufreq/policy1/scaling_min_freq 2914000 # cat cpufreq/policy2/scaling_min_freq 800000 The are affected differently, because intel_pstate_verify_policy() is invoked with limits set to &performance_limits (left behind by policy0) for policy1 and with limits set to &powersave_limits (left behind by policy1) for policy2. Since perf_limits is set to the set of limits matching the policy being updated, using it instead of limits fixes the inconsistency. Fixes: 1443ebbacfd7 (cpufreq: intel_pstate: Fix sysfs limits enforcement for performance policy) Signed-off-by: Rafael J. Wysocki --- drivers/cpufreq/intel_pstate.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index 436a4c5..3dc5466 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -2212,9 +2212,9 @@ static int intel_pstate_verify_policy(struct cpufreq_policy *policy) unsigned int max_freq, min_freq; max_freq = policy->cpuinfo.max_freq * - limits->max_sysfs_pct / 100; + perf_limits->max_sysfs_pct / 100; min_freq = policy->cpuinfo.max_freq * - limits->min_sysfs_pct / 100; + perf_limits->min_sysfs_pct / 100; cpufreq_verify_within_limits(policy, min_freq, max_freq); } -- 2.7.4