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cpuidle: add cpuidle_unregister_driver() error check

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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>
This commit is contained in:
Len Brown
2010-05-22 16:34:10 -04:00
parent 6b2c676bf3
commit c0d64cb031
1 changed files with 4 additions and 1 deletions
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5
drivers/cpuidle/driver.c
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@@ -45,8 +45,11 @@ EXPORT_SYMBOL_GPL(cpuidle_register_driver);
*/ */
void cpuidle_unregister_driver(struct cpuidle_driver *drv) 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; return;
}
spin_lock(&cpuidle_driver_lock); spin_lock(&cpuidle_driver_lock);
cpuidle_curr_driver = NULL; cpuidle_curr_driver = NULL;