[PATCH 2/8] cpuidle: Check cpuidle_enable_device succeed

[Daniel Lezcano <daniel.lezcano@linaro.org>]

The previous patch changed the order of the framework initialization, the
governors are registered first and then the drivers can register their devices.

We can safely remove the __cpuidle_register_device call hack in the
cpuidle_enable_device function and check if the driver is registered before
enabling it. The cpuidle_register_function can check consistently the return
code when enabling the device.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
---
 drivers/cpuidle/cpuidle.c |   17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c
index fdc432f..52ec46b 100644
--- a/drivers/cpuidle/cpuidle.c
+++ b/drivers/cpuidle/cpuidle.c
@@ -292,15 +292,12 @@ int cpuidle_enable_device(struct cpuidle_device *dev)
 	if (!drv || !cpuidle_curr_governor)
 		return -EIO;
 
+	if (dev->registered == 0)
+		return -EINVAL;
+
 	if (!dev->state_count)
 		dev->state_count = drv->state_count;
 
-	if (dev->registered == 0) {
-		ret = __cpuidle_register_device(dev);
-		if (ret)
-			return ret;
-	}
-
 	poll_idle_init(drv);
 
 	ret = cpuidle_add_device_sysfs(dev);
@@ -415,13 +412,17 @@ int cpuidle_register_device(struct cpuidle_device *dev)
 		return ret;
 	}
 
-	cpuidle_enable_device(dev);
+	ret = cpuidle_enable_device(dev);
+	if (ret) {
+		mutex_unlock(&cpuidle_lock);
+		return ret;
+	}
+
 	cpuidle_install_idle_handler();
 
 	mutex_unlock(&cpuidle_lock);
 
 	return 0;
-
 }
 
 EXPORT_SYMBOL_GPL(cpuidle_register_device);
-- 
1.7.9.5