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Message-id: <752138df0dc2daaae09379c754caeb08c97905dc.1275026041.git.len.brown@intel.com>
Date: Fri, 28 May 2010 02:01:56 -0400
From: Len Brown <lenb@...nel.org>
To: linux-pm@...ts.linux-foundation.org
Cc: linux-kernel@...r.kernel.org, Len Brown <len.brown@...el.com>
Subject: [PATCH 3/8] cpuidle: make cpuidle_curr_driver static
From: Len Brown <len.brown@...el.com>
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@...el.com>
---
drivers/cpuidle/cpuidle.c | 12 +++++++-----
drivers/cpuidle/cpuidle.h | 1 -
drivers/cpuidle/driver.c | 11 ++++++++++-
drivers/cpuidle/sysfs.c | 5 +++--
include/linux/cpuidle.h | 2 ++
5 files changed, 22 insertions(+), 9 deletions(-)
diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c
index 12fdd39..1994885 100644
--- a/drivers/cpuidle/cpuidle.c
+++ b/drivers/cpuidle/cpuidle.c
@@ -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);
diff --git a/drivers/cpuidle/cpuidle.h b/drivers/cpuidle/cpuidle.h
index 9476ba3..33e50d5 100644
--- a/drivers/cpuidle/cpuidle.h
+++ b/drivers/cpuidle/cpuidle.h
@@ -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;
diff --git a/drivers/cpuidle/driver.c b/drivers/cpuidle/driver.c
index 826b5c0..fd1601e 100644
--- a/drivers/cpuidle/driver.c
+++ b/drivers/cpuidle/driver.c
@@ -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);
/**
@@ -40,6 +40,15 @@ 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
*/
diff --git a/drivers/cpuidle/sysfs.c b/drivers/cpuidle/sysfs.c
index 0ba9c8b..0310ffa 100644
--- a/drivers/cpuidle/sysfs.c
+++ b/drivers/cpuidle/sysfs.c
@@ -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);
diff --git a/include/linux/cpuidle.h b/include/linux/cpuidle.h
index f5e6480..55215cc 100644
--- a/include/linux/cpuidle.h
+++ b/include/linux/cpuidle.h
@@ -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; }
--
1.6.0.6
--
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