Add a sanity check for cpuidle_register_device by testing if the device
was already registered or not.
Signed-off-by: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>
---
drivers/cpuidle/cpuidle.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c
index a4f5ae6..167f2ae 100644
--- a/drivers/cpuidle/cpuidle.c
+++ b/drivers/cpuidle/cpuidle.c
@@ -400,13 +400,16 @@ static int __cpuidle_register_device(struct cpuidle_device *dev)
*/
int cpuidle_register_device(struct cpuidle_device *dev)
{
- int ret;
+ int ret = -EBUSY;
if (!dev)
return -EINVAL;
mutex_lock(&cpuidle_lock);
+ if (dev->registered)
+ goto out_unlock;
+
ret = __cpuidle_device_init(dev);
if (ret)
goto out_unlock;
--
1.7.9.5
