linux-kernel - [PATCH-v2 2/8] cpuidle: add cpuidle_unregister

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Date:	Thu, 27 May 2010 01:11:03 -0400 (EDT)
From:	Len Brown <lenb@...nel.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	x86@...nel.org, linux-pm@...ts.linux-foundation.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH-v2 2/8] cpuidle: add cpuidle_unregister_driver() error check

From: Len Brown <len.brown@...el.com>

BUG_ON() cpuidle_unregister_driver() being called with
a driver not matching the onee that successfully registered.

Signed-off-by: Len Brown <len.brown@...el.com>
---
 drivers/cpuidle/driver.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)

diff --git a/drivers/cpuidle/driver.c b/drivers/cpuidle/driver.c
index 2257004..5b6fd0f 100644
--- a/drivers/cpuidle/driver.c
+++ b/drivers/cpuidle/driver.c
@@ -45,8 +45,7 @@ EXPORT_SYMBOL_GPL(cpuidle_register_driver);
  */
 void cpuidle_unregister_driver(struct cpuidle_driver *drv)
 {
-	if (!drv)
-		return;
+	BUG_ON(drv != cpuidle_curr_driver)
 
 	spin_lock(&cpuidle_driver_lock);
 	cpuidle_curr_driver = NULL;
-- 
1.6.0.6

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