cpufreq: Acquire the lock in cpufreq_policy_restore() for reading
In cpufreq_policy_restore() before system suspend policy is read from percpu's cpufreq_cpu_data_fallback. It's a read operation rather than a write one, so take the lock for reading in there. Signed-off-by: Lan Tianyu <tianyu.lan@intel.com> Reviewed-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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@ -906,11 +906,11 @@ static struct cpufreq_policy *cpufreq_policy_restore(unsigned int cpu)
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struct cpufreq_policy *policy;
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unsigned long flags;
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write_lock_irqsave(&cpufreq_driver_lock, flags);
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read_lock_irqsave(&cpufreq_driver_lock, flags);
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policy = per_cpu(cpufreq_cpu_data_fallback, cpu);
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write_unlock_irqrestore(&cpufreq_driver_lock, flags);
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read_unlock_irqrestore(&cpufreq_driver_lock, flags);
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return policy;
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}
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