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@linaro.org --- 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;