From 10b9d3f8a4d5c82bff5b232a0063669dc0e0d725 Mon Sep 17 00:00:00 2001
From: Daniel Lezcano <daniel.lezcano@linaro.org>
Date: Wed, 12 Jun 2013 15:08:49 +0200
Subject: cpuidle: Check cpuidle_enable_device() return value

We previously changed the ordering of the cpuidle framework
initialization so that the governors are registered before the
drivers which can register their devices right from the start.

Now, we can safely remove the __cpuidle_register_device() call hack
in cpuidle_enable_device() and check if the driver has been
registered before enabling it.  Then, cpuidle_register_device() can
consistently check the cpuidle_enable_device() return value when
enabling the device.

[rjw: Changelog]
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c
index fdc432f..4deed97 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)
+		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);
-- 
cgit v0.10.2