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acpi-cpufreq: Fix an ACPI perf unregister issue 

As policy->cpu may not be same in acpi_cpufreq_cpu_init() and
acpi_cpufreq_cpu_exit(). There is a risk that we use different CPU
to un/register ACPI performance. So acpi_processor_unregister_performance()
may not be able to do the cleanup work. That causes a memory leak. And
if there will be another acpi_processor_register_performance() call,
it may also fail thanks to the internal check of pr->performace.

So add a new struct acpi_cpufreq_data field, acpi_perf_cpu, to fix
this issue.

Signed-off-by: Pan Xinhui <xinhuix.pan@intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
[ rjw: Changelog ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Pan Xinhui 2015-07-10 14:36:20 +08:00 committed by Rafael J. Wysocki
parent 7f0fa40f5a
commit 8cfcfd3900
1 changed files with 3 additions and 1 deletions
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4
drivers/cpufreq/acpi-cpufreq.c
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@ -69,6 +69,7 @@ struct acpi_cpufreq_data {
struct cpufreq_frequency_table *freq_table;
unsigned int resume;
unsigned int cpu_feature;
unsigned int acpi_perf_cpu;
cpumask_var_t freqdomain_cpus;
};
@ -677,6 +678,7 @@ static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy)
}
data->acpi_data = per_cpu_ptr(acpi_perf_data, cpu);
data->acpi_perf_cpu = cpu;
policy->driver_data = data;
if (cpu_has(c, X86_FEATURE_CONSTANT_TSC))
@ -861,7 +863,7 @@ static int acpi_cpufreq_cpu_exit(struct cpufreq_policy *policy)
if (data) {
policy->driver_data = NULL;
acpi_processor_unregister_performance(data->acpi_data,
policy->cpu);
data->acpi_perf_cpu);
free_cpumask_var(data->freqdomain_cpus);
kfree(data->freq_table);
kfree(data);