/* Get notified when a cpu comes on/off. Be hotplug friendly. */
static __cpuinit int thermal_throttle_cpu_callback(struct notifier_block *nfb,
unsigned long action,
void *hcpu)
{
unsigned int cpu = (unsigned long)hcpu;
struct sys_device *sys_dev;
int err = 0;
sys_dev = get_cpu_sysdev(cpu);
switch (action) {
case CPU_UP_PREPARE:
case CPU_UP_PREPARE_FROZEN:
mutex_lock(&therm_cpu_lock);
err = thermal_throttle_add_dev(sys_dev);
mutex_unlock(&therm_cpu_lock);
WARN_ON(err);
break;
case CPU_UP_CANCELED:
case CPU_UP_CANCELED_FROZEN:
case CPU_DEAD:
case CPU_DEAD_FROZEN:
mutex_lock(&therm_cpu_lock);
thermal_throttle_remove_dev(sys_dev);
mutex_unlock(&therm_cpu_lock);
break;
}
return err ? NOTIFY_BAD : NOTIFY_OK;
}
static __init int thermal_throttle_init_device(void)
{
unsigned int cpu = 0;
int err;
if (!atomic_read(&therm_throt_en))
return 0;
register_hotcpu_notifier(&thermal_throttle_cpu_notifier);
#ifdef CONFIG_HOTPLUG_CPU
mutex_lock(&therm_cpu_lock);
#endif
/* connect live CPUs to sysfs */
for_each_online_cpu(cpu) {
err = thermal_throttle_add_dev(get_cpu_sysdev(cpu));
WARN_ON(err);
}
#ifdef CONFIG_HOTPLUG_CPU
mutex_unlock(&therm_cpu_lock);
#endif
return 0;
}
