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path: root/drivers/cpuidle/driver.c
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Diffstat (limited to 'drivers/cpuidle/driver.c')
-rw-r--r--drivers/cpuidle/driver.c16
1 files changed, 14 insertions, 2 deletions
diff --git a/drivers/cpuidle/driver.c b/drivers/cpuidle/driver.c
index 2257004..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);
/**
@@ -40,13 +40,25 @@ 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
*/
void cpuidle_unregister_driver(struct cpuidle_driver *drv)
{
- if (!drv)
+ if (drv != cpuidle_curr_driver) {
+ WARN(1, "invalid cpuidle_unregister_driver(%s)\n",
+ drv->name);
return;
+ }
spin_lock(&cpuidle_driver_lock);
cpuidle_curr_driver = NULL;