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>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index dc457abb7dab..f8e514d7fbc4 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -2103,8 +2103,12 @@ static int intel_cpufreq_verify_policy(struct cpufreq_policy *policy)
         if (per_cpu_limits)
                 perf_limits = cpu->perf_limits;
 
+        mutex_lock(&intel_pstate_limits_lock);
+
         intel_pstate_update_perf_limits(policy, perf_limits);
 
+        mutex_unlock(&intel_pstate_limits_lock);
+
         return 0;
 }