_find_device_opp() should be called with rcu-read lock or
dev_opp_list_lock held. Add the opp_rcu_lockdep_assert() check to make
sure caller have taken appropriate locks.
Fix comment over the routine as well.
Cc: 4.3 <stable@xxxxxxxxxxxxxxx> # 4.3
Suggested-by: Stephen Boyd <sboyd@xxxxxxxxxxxxxx>
Signed-off-by: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
---
drivers/base/power/opp/core.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/drivers/base/power/opp/core.c b/drivers/base/power/opp/core.c
index 7a395f5ba5f9..5e4b1d82b2f8 100644
--- a/drivers/base/power/opp/core.c
+++ b/drivers/base/power/opp/core.c
@@ -81,14 +81,18 @@ static struct device_opp *_managed_opp(const struct device_node *np)
* Return: pointer to 'struct device_opp' if found, otherwise -ENODEV or
* -EINVAL based on type of error.
*
- * Locking: This function must be called under rcu_read_lock(). device_opp
- * is a RCU protected pointer. This means that device_opp is valid as long
- * as we are under RCU lock.
+ * Locking: For readers, this function must be called under rcu_read_lock().
+ * device_opp is a RCU protected pointer, which means that device_opp is valid
+ * as long as we are under RCU lock.
+ *
+ * For Writers, this function must be called with dev_opp_list_lock held.
*/
struct device_opp *_find_device_opp(struct device *dev)
{
struct device_opp *dev_opp;
+ opp_rcu_lockdep_assert();
+
if (IS_ERR_OR_NULL(dev)) {
pr_err("%s: Invalid parameters\n", __func__);
return ERR_PTR(-EINVAL);
--
2.6.2.198.g614a2ac
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