cpuidle: call cpuidle_get_driver() from after taking cpuidle_driver_lock

There are a few cpuidle_get_driver() calls that aren't made under
cpuidle_driver_lock which is incorrect.

Fix them by calling cpuidle_get_driver() after taking cpuidle_driver_lock.

Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/cpuidle/driver.c b/drivers/cpuidle/driver.c
index a930005..2458a74 100644 (file)
--- a/drivers/cpuidle/driver.c
+++ b/drivers/cpuidle/driver.c
@@ -338,10 +338,11 @@ 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 (file)
--- 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