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cpufreq: Convert to hotplug state machine

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Install the callbacks via the state machine.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Acked-by: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: linux-pm@vger.kernel.org
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Viresh Kumar <viresh.kumar@linaro.or
Cc: rt@linutronix.de
Link: http://lkml.kernel.org/r/20160906170457.32393-13-bigeasy@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Sebastian Andrzej Siewior 2016-09-06 19:04:48 +02:00 committed by Thomas Gleixner
parent 64f3bf2f85
commit 27622b061e
1 changed files with 12 additions and 26 deletions
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38
drivers/cpufreq/cpufreq.c
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@ -1358,7 +1358,7 @@ static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif)
return add_cpu_dev_symlink(policy, cpu);
}
static void cpufreq_offline(unsigned int cpu)
static int cpufreq_offline(unsigned int cpu)
{
struct cpufreq_policy *policy;
int ret;
@ -1368,7 +1368,7 @@ static void cpufreq_offline(unsigned int cpu)
policy = cpufreq_cpu_get_raw(cpu);
if (!policy) {
pr_debug("%s: No cpu_data found\n", __func__);
return;
return 0;
}
down_write(&policy->rwsem);
@ -1417,6 +1417,7 @@ static void cpufreq_offline(unsigned int cpu)
unlock:
up_write(&policy->rwsem);
return 0;
}
/**
@ -2332,28 +2333,6 @@ unlock:
}
EXPORT_SYMBOL(cpufreq_update_policy);
static int cpufreq_cpu_callback(struct notifier_block *nfb,
unsigned long action, void *hcpu)
{
unsigned int cpu = (unsigned long)hcpu;
switch (action & ~CPU_TASKS_FROZEN) {
case CPU_ONLINE:
case CPU_DOWN_FAILED:
cpufreq_online(cpu);
break;
case CPU_DOWN_PREPARE:
cpufreq_offline(cpu);
break;
}
return NOTIFY_OK;
}
static struct notifier_block __refdata cpufreq_cpu_notifier = {
.notifier_call = cpufreq_cpu_callback,
};
/*********************************************************************
* BOOST *
*********************************************************************/
@ -2455,6 +2434,7 @@ EXPORT_SYMBOL_GPL(cpufreq_boost_enabled);
/*********************************************************************
* REGISTER / UNREGISTER CPUFREQ DRIVER *
*********************************************************************/
static enum cpuhp_state hp_online;
/**
* cpufreq_register_driver - register a CPU Frequency driver
@ -2517,7 +2497,13 @@ int cpufreq_register_driver(struct cpufreq_driver *driver_data)
goto err_if_unreg;
}
register_hotcpu_notifier(&cpufreq_cpu_notifier);
ret = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN, "cpufreq:online",
cpufreq_online,
cpufreq_offline);
if (ret < 0)
goto err_if_unreg;
hp_online = ret;
pr_debug("driver %s up and running\n", driver_data->name);
goto out;
@ -2556,7 +2542,7 @@ int cpufreq_unregister_driver(struct cpufreq_driver *driver)
get_online_cpus();
subsys_interface_unregister(&cpufreq_interface);
remove_boost_sysfs_file();
unregister_hotcpu_notifier(&cpufreq_cpu_notifier);
cpuhp_remove_state_nocalls(hp_online);
write_lock_irqsave(&cpufreq_driver_lock, flags);