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authorDaniel Lezcano <daniel.lezcano@linaro.org>2013-06-12 17:08:49 +0400
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2013-07-15 04:09:47 +0400
commit10b9d3f8a4d5c82bff5b232a0063669dc0e0d725 (patch)
treeb92be09e1776a85c6907b7495988c31c7c13865b /drivers/cpuidle
parent137b944e100278d696826cf25c83014ac17473fe (diff)
downloadlinux-10b9d3f8a4d5c82bff5b232a0063669dc0e0d725.tar.xz
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>
Diffstat (limited to 'drivers/cpuidle')
-rw-r--r--drivers/cpuidle/cpuidle.c17
1 files changed, 9 insertions, 8 deletions
diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c
index fdc432f18022..4deed977f209 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);