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hwmon: (coretemp) Convert to hotplug state machine

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Install the callbacks via the state machine. Setup and teardown are handled
by the hotplug core.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: linux-hwmon@vger.kernel.org
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Jean Delvare <jdelvare@suse.com>
Cc: rt@linuxtronix.de
Cc: Guenter Roeck <linux@roeck-us.net>
Link: http://lkml.kernel.org/r/20161117183541.8588-5-bigeasy@linutronix.de
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Thomas Gleixner 2016-11-22 17:42:04 +00:00 committed by Guenter Roeck
parent 4b138cf73f
commit e00ca5df37
1 changed files with 29 additions and 57 deletions
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86
drivers/hwmon/coretemp.c
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@ -649,7 +649,7 @@ static void coretemp_device_remove(unsigned int cpu)
mutex_unlock(&pdev_list_mutex);
}
static void get_core_online(unsigned int cpu)
static int coretemp_cpu_online(unsigned int cpu)
{
struct platform_device *pdev = coretemp_get_pdev(cpu);
struct cpuinfo_x86 *c = &cpu_data(cpu);
@ -662,12 +662,12 @@ static void get_core_online(unsigned int cpu)
* without thermal sensors will be filtered out.
*/
if (!cpu_has(c, X86_FEATURE_DTHERM))
return;
return 0;
if (!pdev) {
/* Check the microcode version of the CPU */
if (chk_ucode_version(cpu))
return;
return 0;
/*
* Alright, we have DTS support.
@ -677,7 +677,7 @@ static void get_core_online(unsigned int cpu)
*/
err = coretemp_device_add(cpu);
if (err)
return;
return 0;
pdev = coretemp_get_pdev(cpu);
/*
@ -697,9 +697,10 @@ static void get_core_online(unsigned int cpu)
coretemp_add_core(pdev, cpu, 0);
cpumask_set_cpu(cpu, &pdata->cpumask);
return 0;
}
static void put_core_offline(unsigned int cpu)
static int coretemp_cpu_offline(unsigned int cpu)
{
struct platform_device *pdev = coretemp_get_pdev(cpu);
struct platform_data *pd;
@ -708,12 +709,12 @@ static void put_core_offline(unsigned int cpu)
/* If the physical CPU device does not exist, just return */
if (!pdev)
return;
return 0;
/* The core id is too big, just return */
indx = TO_ATTR_NO(cpu);
if (indx > MAX_CORE_DATA - 1)
return;
return 0;
pd = platform_get_drvdata(pdev);
tdata = pd->core_data[indx];
@ -742,7 +743,7 @@ static void put_core_offline(unsigned int cpu)
*/
if (cpumask_empty(&pd->cpumask)) {
coretemp_device_remove(cpu);
return;
return 0;
}
/*
* Check whether this core is the target for the package
@ -755,38 +756,19 @@ static void put_core_offline(unsigned int cpu)
tdata->cpu = target;
mutex_unlock(&tdata->update_lock);
}
return 0;
}
static int coretemp_cpu_callback(struct notifier_block *nfb,
unsigned long action, void *hcpu)
{
unsigned int cpu = (unsigned long) hcpu;
switch (action) {
case CPU_ONLINE:
case CPU_DOWN_FAILED:
get_core_online(cpu);
break;
case CPU_DOWN_PREPARE:
put_core_offline(cpu);
break;
}
return NOTIFY_OK;
}
static struct notifier_block coretemp_cpu_notifier __refdata = {
.notifier_call = coretemp_cpu_callback,
};
static const struct x86_cpu_id __initconst coretemp_ids[] = {
{ X86_VENDOR_INTEL, X86_FAMILY_ANY, X86_MODEL_ANY, X86_FEATURE_DTHERM },
{}
};
MODULE_DEVICE_TABLE(x86cpu, coretemp_ids);
static enum cpuhp_state coretemp_hp_online;
static int __init coretemp_init(void)
{
int i, err;
int err;
/*
* CPUID.06H.EAX[0] indicates whether the CPU has thermal
@ -798,52 +780,42 @@ static int __init coretemp_init(void)
err = platform_driver_register(&coretemp_driver);
if (err)
goto exit;
return err;
cpu_notifier_register_begin();
for_each_online_cpu(i)
get_core_online(i);
get_online_cpus();
err = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "hwmon/coretemp:online",
coretemp_cpu_online, coretemp_cpu_offline);
if (err < 0)
goto exit_driver_unreg;
coretemp_hp_online = err;
#ifndef CONFIG_HOTPLUG_CPU
if (list_empty(&pdev_list)) {
cpu_notifier_register_done();
err = -ENODEV;
goto exit_driver_unreg;
goto exit_hp_unreg;
}
#endif
__register_hotcpu_notifier(&coretemp_cpu_notifier);
cpu_notifier_register_done();
put_online_cpus();
return 0;
#ifndef CONFIG_HOTPLUG_CPU
exit_hp_unreg:
cpuhp_remove_state(coretemp_hp_online);
put_online_cpus();
#endif
exit_driver_unreg:
platform_driver_unregister(&coretemp_driver);
#endif
exit:
return err;
}
module_init(coretemp_init)
static void __exit coretemp_exit(void)
{
struct pdev_entry *p, *n;
cpu_notifier_register_begin();
__unregister_hotcpu_notifier(&coretemp_cpu_notifier);
mutex_lock(&pdev_list_mutex);
list_for_each_entry_safe(p, n, &pdev_list, list) {
platform_device_unregister(p->pdev);
list_del(&p->list);
kfree(p);
}
mutex_unlock(&pdev_list_mutex);
cpu_notifier_register_done();
cpuhp_remove_state(coretemp_hp_online);
platform_driver_unregister(&coretemp_driver);
}
module_exit(coretemp_exit)
MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>");
MODULE_DESCRIPTION("Intel Core temperature monitor");
MODULE_LICENSE("GPL");
module_init(coretemp_init)
module_exit(coretemp_exit)