linux-kernel - [PATCH 12/21] cpuidle: call cpuidle_get_driver() from after taking cpuidle_driver

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Message-Id: <193825f6c2fb70462f6da2cc60e7c6c02682d6c5.1379779777.git.viresh.kumar@linaro.org>
Date:	Sun, 22 Sep 2013 06:51:04 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	rjw@...k.pl, daniel.lezcano@...aro.org
Cc:	linaro-kernel@...ts.linaro.org, patches@...aro.org,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
	Viresh Kumar <viresh.kumar@...aro.org>
Subject: [PATCH 12/21] cpuidle: call cpuidle_get_driver() from after taking cpuidle_driver_lock

cpuidle_driver_lock is taken correctly at most of the places but at few places
calls to cpuidle_get_driver() are done from outside of this lock.

Fix them by calling cpuidle_get_driver() after taking cpuidle_driver_lock.

Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
---
 drivers/cpuidle/driver.c | 3 ++-
 drivers/cpuidle/sysfs.c  | 3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/cpuidle/driver.c b/drivers/cpuidle/driver.c
index 6279e1c..7b2510a 100644
--- a/drivers/cpuidle/driver.c
+++ b/drivers/cpuidle/driver.c
@@ -340,10 +340,11 @@ struct cpuidle_driver *cpuidle_driver_ref(void)
  */
 void cpuidle_driver_unref(void)
 {
-	struct cpuidle_driver *drv = cpuidle_get_driver();
+	struct cpuidle_driver *drv;
 
 	spin_lock(&cpuidle_driver_lock);
 
+	drv = cpuidle_get_driver();
 	if (drv && !WARN_ON(drv->refcnt <= 0))
 		drv->refcnt--;
 
diff --git a/drivers/cpuidle/sysfs.c b/drivers/cpuidle/sysfs.c
index 8739cc0..a022393 100644
--- a/drivers/cpuidle/sysfs.c
+++ b/drivers/cpuidle/sysfs.c
@@ -52,9 +52,10 @@ static ssize_t show_current_driver(struct device *dev,
 				   char *buf)
 {
 	ssize_t ret;
-	struct cpuidle_driver *cpuidle_driver = cpuidle_get_driver();
+	struct cpuidle_driver *cpuidle_driver;
 
 	spin_lock(&cpuidle_driver_lock);
+	cpuidle_driver = cpuidle_get_driver();
 	if (cpuidle_driver)
 		ret = sprintf(buf, "%s\n", cpuidle_driver->name);
 	else
-- 
1.7.12.rc2.18.g61b472e

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