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Commit aa439248 authored by Rafael J. Wysocki's avatar Rafael J. Wysocki
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cpufreq: intel_pstate: Use locking in intel_pstate_resume() 



Theoretically, intel_pstate_resume() may be executed in parallel
with intel_pstate_set_policy(), if the latter is invoked via
cpufreq_update_policy() as a result of a notification, so use
intel_pstate_limits_lock in there too to avoid race conditions.

Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: default avatarSrinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
parent 366430b5

drivers/cpufreq/intel_pstate.c

+9 −1
Original line number Diff line number Diff line
@@ -914,12 +914,20 @@ static int intel_pstate_hwp_save_state(struct cpufreq_policy *policy) 


static int intel_pstate_resume(struct cpufreq_policy *policy)

{

	int ret;



	if (!hwp_active)

		return 0;



	mutex_lock(&intel_pstate_limits_lock);



	all_cpu_data[policy->cpu]->epp_policy = 0;



	return intel_pstate_hwp_set_policy(policy);

	ret = intel_pstate_hwp_set_policy(policy);



	mutex_unlock(&intel_pstate_limits_lock);



	return ret;

}



static void intel_pstate_hwp_set_online_cpus(void)