#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/suspend.h>
+#include <linux/syscore_ops.h>
#include <linux/tick.h>
#include <trace/events/power.h>
/* set up files for this cpu device */
drv_attr = cpufreq_driver->attr;
- while ((drv_attr) && (*drv_attr)) {
+ while (drv_attr && *drv_attr) {
ret = sysfs_create_file(&policy->kobj, &((*drv_attr)->attr));
if (ret)
return ret;
}
EXPORT_SYMBOL_GPL(cpufreq_driver_target);
-/*
- * when "event" is CPUFREQ_GOV_LIMITS
- */
-
static int __cpufreq_governor(struct cpufreq_policy *policy,
unsigned int event)
{
/* Don't start any governor operations if we are entering suspend */
if (cpufreq_suspended)
return 0;
+ /*
+ * Governor might not be initiated here if ACPI _PPC changed
+ * notification happened, so check it.
+ */
+ if (!policy->governor)
+ return -EINVAL;
if (policy->governor->max_transition_latency &&
policy->cpuinfo.transition_latency >
}
EXPORT_SYMBOL_GPL(cpufreq_unregister_driver);
+/*
+ * Stop cpufreq at shutdown to make sure it isn't holding any locks
+ * or mutexes when secondary CPUs are halted.
+ */
+static struct syscore_ops cpufreq_syscore_ops = {
+ .shutdown = cpufreq_suspend,
+};
+
static int __init cpufreq_core_init(void)
{
if (cpufreq_disabled())
cpufreq_global_kobject = kobject_create();
BUG_ON(!cpufreq_global_kobject);
+ register_syscore_ops(&cpufreq_syscore_ops);
+
return 0;
}
core_initcall(cpufreq_core_init);