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cpufreq: check cpufreq_policy_list instead of scanning policies for all CPUs 

CPUFREQ_STICKY flag is set by drivers which don't want to get unregistered
even if cpufreq-core isn't able to initialize policy for any CPU.

When this flag isn't set, we try to unregister the driver. To find out
which CPUs are registered and which are not, we try to check per_cpu
cpufreq_cpu_data for all CPUs. Because we have a list of valid policies
available now, we better check if the list is empty or not instead of
the 'for' loop. That will be much more efficient.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Viresh Kumar 2015-01-02 12:34:35 +05:30 committed by Rafael J. Wysocki
parent 39c132eebd
commit ce1bcfe94d
1 changed files with 5 additions and 16 deletions
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21
drivers/cpufreq/cpufreq.c
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@ -2455,23 +2455,12 @@ int cpufreq_register_driver(struct cpufreq_driver *driver_data)
if (ret)
goto err_boost_unreg;
if (!(cpufreq_driver->flags & CPUFREQ_STICKY)) {
int i;
ret = -ENODEV;
/* check for at least one working CPU */
for (i = 0; i < nr_cpu_ids; i++)
if (cpu_possible(i) && per_cpu(cpufreq_cpu_data, i)) {
ret = 0;
break;
}
if (!(cpufreq_driver->flags & CPUFREQ_STICKY) &&
list_empty(&cpufreq_policy_list)) {
/* if all ->init() calls failed, unregister */
if (ret) {
pr_debug("no CPU initialized for driver %s\n",
driver_data->name);
goto err_if_unreg;
}
pr_debug("%s: No CPU initialized for driver %s\n", __func__,
driver_data->name);
goto err_if_unreg;
}
register_hotcpu_notifier(&cpufreq_cpu_notifier);