PM / OPP: take RCU lock in dev_pm_opp_get_opp_count

A lot of callers are missing the fact that dev_pm_opp_get_opp_count
needs to be called under RCU lock. Given that RCU locks can safely be
nested, instead of providing *_locked() API, let's take RCU lock inside
dev_pm_opp_get_opp_count() and leave callers as is.

Signed-off-by: Dmitry Torokhov <dtor@chromium.org>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/base/power/opp.c b/drivers/base/power/opp.c
index aac7abc..106c693 100644 (file)
--- a/drivers/base/power/opp.c
+++ b/drivers/base/power/opp.c
@@ -216,9 +216,7 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_get_freq);
  * This function returns the number of available opps if there are any,
  * else returns 0 if none or the corresponding error value.
  *
- * Locking: This function must be called under rcu_read_lock(). This function
- * internally references two RCU protected structures: device_opp and opp which
- * are safe as long as we are under a common RCU locked section.
+ * Locking: This function takes rcu_read_lock().
  */
 int dev_pm_opp_get_opp_count(struct device *dev)
 {
@@ -226,13 +224,14 @@ int dev_pm_opp_get_opp_count(struct device *dev)
        struct dev_pm_opp *temp_opp;
        int count = 0;
 
-       opp_rcu_lockdep_assert();
+       rcu_read_lock();
 
        dev_opp = find_device_opp(dev);
        if (IS_ERR(dev_opp)) {
-               int r = PTR_ERR(dev_opp);
-               dev_err(dev, "%s: device OPP not found (%d)\n", __func__, r);
-               return r;
+               count = PTR_ERR(dev_opp);
+               dev_err(dev, "%s: device OPP not found (%d)\n",
+                       __func__, count);
+               goto out_unlock;
        }
 
        list_for_each_entry_rcu(temp_opp, &dev_opp->opp_list, node) {
@@ -240,6 +239,8 @@ int dev_pm_opp_get_opp_count(struct device *dev)
                        count++;
        }
 
+out_unlock:
+       rcu_read_unlock();
        return count;
 }
 EXPORT_SYMBOL_GPL(dev_pm_opp_get_opp_count);