cpuidle: make cpuidle_curr_driver static

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>

1 files changed, 7 insertions, 5 deletions

diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c
index 12fdd3987a36..199488576a05 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);