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cpuidle: make cpuidle_curr_driver static

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cpuidle_register_driver() sets cpuidle_curr_driver
cpuidle_unregister_driver() clears cpuidle_curr_driver

We should't expose cpuidle_curr_driver to
potential modification except via these interfaces.
So make it static and create cpuidle_get_driver() to observe it.

Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Len Brown 2010-05-22 16:57:26 -04:00
parent c0d64cb031
commit 752138df0d
5 changed files with 22 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
drivers/cpuidle/cpuidle.c
View File

@ -156,7 +156,7 @@ int cpuidle_enable_device(struct cpuidle_device *dev)
if (dev->enabled)
return 0;
if (!cpuidle_curr_driver || !cpuidle_curr_governor)
if (!cpuidle_get_driver() || !cpuidle_curr_governor)
return -EIO;
if (!dev->state_count)
return -EINVAL;
@ -207,7 +207,7 @@ void cpuidle_disable_device(struct cpuidle_device *dev)
{
if (!dev->enabled)
return;
if (!cpuidle_curr_driver || !cpuidle_curr_governor)
if (!cpuidle_get_driver() || !cpuidle_curr_governor)
return;
dev->enabled = 0;
@ -271,10 +271,11 @@ static int __cpuidle_register_device(struct cpuidle_device *dev)
{
int ret;
struct sys_device *sys_dev = get_cpu_sysdev((unsigned long)dev->cpu);
struct cpuidle_driver *cpuidle_driver = cpuidle_get_driver();
if (!sys_dev)
return -EINVAL;
if (!try_module_get(cpuidle_curr_driver->owner))
if (!try_module_get(cpuidle_driver->owner))
return -EINVAL;
init_completion(&dev->kobj_unregister);
@ -284,7 +285,7 @@ static int __cpuidle_register_device(struct cpuidle_device *dev)
per_cpu(cpuidle_devices, dev->cpu) = dev;
list_add(&dev->device_list, &cpuidle_detected_devices);
if ((ret = cpuidle_add_sysfs(sys_dev))) {
module_put(cpuidle_curr_driver->owner);
module_put(cpuidle_driver->owner);
return ret;
}
@ -325,6 +326,7 @@ EXPORT_SYMBOL_GPL(cpuidle_register_device);
void cpuidle_unregister_device(struct cpuidle_device *dev)
{
struct sys_device *sys_dev = get_cpu_sysdev((unsigned long)dev->cpu);
struct cpuidle_driver *cpuidle_driver = cpuidle_get_driver();
if (dev->registered == 0)
return;
@ -340,7 +342,7 @@ void cpuidle_unregister_device(struct cpuidle_device *dev)
cpuidle_resume_and_unlock();
module_put(cpuidle_curr_driver->owner);
module_put(cpuidle_driver->owner);
}
EXPORT_SYMBOL_GPL(cpuidle_unregister_device);

1
drivers/cpuidle/cpuidle.h
View File

@ -9,7 +9,6 @@
/* For internal use only */
extern struct cpuidle_governor *cpuidle_curr_governor;
extern struct cpuidle_driver *cpuidle_curr_driver;
extern struct list_head cpuidle_governors;
extern struct list_head cpuidle_detected_devices;
extern struct mutex cpuidle_lock;

11
drivers/cpuidle/driver.c
View File

@ -14,7 +14,7 @@
#include "cpuidle.h"
struct cpuidle_driver *cpuidle_curr_driver;
static struct cpuidle_driver *cpuidle_curr_driver;
DEFINE_SPINLOCK(cpuidle_driver_lock);
/**
@ -39,6 +39,15 @@ int cpuidle_register_driver(struct cpuidle_driver *drv)
EXPORT_SYMBOL_GPL(cpuidle_register_driver);
/**
* cpuidle_get_driver - return the current driver
*/
struct cpuidle_driver *cpuidle_get_driver(void)
{
return cpuidle_curr_driver;
}
EXPORT_SYMBOL_GPL(cpuidle_get_driver);
/**
* cpuidle_unregister_driver - unregisters a driver
* @drv: the driver

5
drivers/cpuidle/sysfs.c
View File

@ -47,10 +47,11 @@ static ssize_t show_current_driver(struct sysdev_class *class,
char *buf)
{
ssize_t ret;
struct cpuidle_driver *cpuidle_driver = cpuidle_get_driver();
spin_lock(&cpuidle_driver_lock);
if (cpuidle_curr_driver)
ret = sprintf(buf, "%s\n", cpuidle_curr_driver->name);
if (cpuidle_driver)
ret = sprintf(buf, "%s\n", cpuidle_driver->name);
else
ret = sprintf(buf, "none\n");
spin_unlock(&cpuidle_driver_lock);

2
include/linux/cpuidle.h
View File

@ -125,6 +125,7 @@ struct cpuidle_driver {
#ifdef CONFIG_CPU_IDLE
extern int cpuidle_register_driver(struct cpuidle_driver *drv);
struct cpuidle_driver *cpuidle_get_driver(void);
extern void cpuidle_unregister_driver(struct cpuidle_driver *drv);
extern int cpuidle_register_device(struct cpuidle_device *dev);
extern void cpuidle_unregister_device(struct cpuidle_device *dev);
@ -138,6 +139,7 @@ extern void cpuidle_disable_device(struct cpuidle_device *dev);
static inline int cpuidle_register_driver(struct cpuidle_driver *drv)
{return -ENODEV; }
static inline struct cpuidle_driver *cpuidle_get_driver(void) {return NULL; }
static inline void cpuidle_unregister_driver(struct cpuidle_driver *drv) { }
static inline int cpuidle_register_device(struct cpuidle_device *dev)
{return -ENODEV; }