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cpufreq: Rearrange locking in cpufreq_remove_dev()
Currently, cpufreq_remove_dev() invokes the ->exit() driver callback without holding the policy rwsem which is inconsistent with what happens if ->exit() is invoked directly from cpufreq_offline(). It also manipulates the real_cpus mask and removes the CPU device symlink without holding the policy rwsem, but cpufreq_offline() holds the rwsem around the modifications thereof. For consistency, modify cpufreq_remove_dev() to hold the policy rwsem until the ->exit() callback has been called (or it has been determined that it is not necessary to call it). Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
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@ -1660,18 +1660,25 @@ static void cpufreq_remove_dev(struct device *dev, struct subsys_interface *sif)
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if (!policy)
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return;
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down_write(&policy->rwsem);
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if (cpu_online(cpu))
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cpufreq_offline(cpu);
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__cpufreq_offline(cpu, policy);
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remove_cpu_dev_symlink(policy, cpu, dev);
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if (cpumask_empty(policy->real_cpus)) {
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/* We did light-weight exit earlier, do full tear down now */
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if (cpufreq_driver->offline)
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cpufreq_driver->exit(policy);
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cpufreq_policy_free(policy);
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if (!cpumask_empty(policy->real_cpus)) {
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up_write(&policy->rwsem);
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return;
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}
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/* We did light-weight exit earlier, do full tear down now */
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if (cpufreq_driver->offline)
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cpufreq_driver->exit(policy);
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up_write(&policy->rwsem);
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cpufreq_policy_free(policy);
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}
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/**
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