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cpufreq: acpi-cpufreq: Use cpufreq_cpu_get_raw() in ->get() 

cpufreq_cpu_get() called by get_cur_freq_on_cpu() is overkill,
because the ->get() callback is always invoked in a context in
which all of the conditions checked by cpufreq_cpu_get() are
guaranteed to be satisfied.

Use cpufreq_cpu_get_raw() instead of it and drop the
corresponding cpufreq_cpu_put() from get_cur_freq_on_cpu().

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
This commit is contained in:
Rafael J. Wysocki 2015-09-16 02:17:49 +02:00
parent 6ff33f3902
commit 1f0bd44e93
3 changed files with 8 additions and 4 deletions
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3
drivers/cpufreq/acpi-cpufreq.c
View File

@ -375,12 +375,11 @@ static unsigned int get_cur_freq_on_cpu(unsigned int cpu)
pr_debug("get_cur_freq_on_cpu (%d)\n", cpu);
policy = cpufreq_cpu_get(cpu);
policy = cpufreq_cpu_get_raw(cpu);
if (unlikely(!policy))
return 0;
data = policy->driver_data;
cpufreq_cpu_put(policy);
if (unlikely(!data || !data->freq_table))
return 0;

4
drivers/cpufreq/cpufreq.c
View File

@ -238,13 +238,13 @@ int cpufreq_generic_init(struct cpufreq_policy *policy,
}
EXPORT_SYMBOL_GPL(cpufreq_generic_init);
/* Only for cpufreq core internal use */
static struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu)
struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu)
{
struct cpufreq_policy *policy = per_cpu(cpufreq_cpu_data, cpu);
return policy && cpumask_test_cpu(cpu, policy->cpus) ? policy : NULL;
}
EXPORT_SYMBOL_GPL(cpufreq_cpu_get_raw);
unsigned int cpufreq_generic_get(unsigned int cpu)
{

5
include/linux/cpufreq.h
View File

@ -127,9 +127,14 @@ struct cpufreq_policy {
#define CPUFREQ_SHARED_TYPE_ANY (3) /* Freq can be set from any dependent CPU*/
#ifdef CONFIG_CPU_FREQ
struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu);
struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu);
void cpufreq_cpu_put(struct cpufreq_policy *policy);
#else
static inline struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu)
{
return NULL;
}
static inline struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu)
{
return NULL;