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cpuidle: add cpuidle_unregister_driver() error check
author
Len Brown
<len.brown@intel.com>
Sat, 22 May 2010 20:34:10 +0000
(16:34 -0400)
committer
Len Brown
<len.brown@intel.com>
Thu, 27 May 2010 17:04:04 +0000
(13:04 -0400)
Assure that cpuidle_unregister_driver() will not clobber
the registered driver if unregistered by somebody else.
Signed-off-by: Len Brown <len.brown@intel.com>
drivers/cpuidle/driver.c
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diff --git
a/drivers/cpuidle/driver.c
b/drivers/cpuidle/driver.c
index 2257004fe33d528454a8c40680c08b0ea9335348..826b5c0aa12bb3cd7147ad624ae14861288c620a 100644
(file)
--- a/
drivers/cpuidle/driver.c
+++ b/
drivers/cpuidle/driver.c
@@
-45,8
+45,11
@@
EXPORT_SYMBOL_GPL(cpuidle_register_driver);
*/
void cpuidle_unregister_driver(struct cpuidle_driver *drv)
{
- if (!drv)
+ if (drv != cpuidle_curr_driver) {
+ WARN(1, "invalid cpuidle_unregister_driver(%s)\n",
+ drv->name);
return;
+ }
spin_lock(&cpuidle_driver_lock);
cpuidle_curr_driver = NULL;