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cpufreq: intel_pstate: Use locking in intel_cpufreq_verify_policy() 

Race conditions are possible if intel_cpufreq_verify_policy()
is executed in parallel with global limits updates from sysfs,
so the invocation of intel_pstate_update_perf_limits() in it
should be carried out under intel_pstate_limits_lock.

Make that happen.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
This commit is contained in:
Rafael J. Wysocki 2016-12-30 15:57:11 +01:00
parent aa439248ab
commit cad3046796
1 changed files with 4 additions and 0 deletions
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4
drivers/cpufreq/intel_pstate.c
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@ -2103,8 +2103,12 @@ static int intel_cpufreq_verify_policy(struct cpufreq_policy *policy)
if (per_cpu_limits) if (per_cpu_limits)
perf_limits = cpu->perf_limits; perf_limits = cpu->perf_limits;
mutex_lock(&intel_pstate_limits_lock);
intel_pstate_update_perf_limits(policy, perf_limits); intel_pstate_update_perf_limits(policy, perf_limits);
mutex_unlock(&intel_pstate_limits_lock);
return 0; return 0;
} }