Certain OPP APIs need to be called under RCU lock; let's add a few
rcu_lockdep_assert() calls to warn about potential misuse.
Signed-off-by: Dmitry Torokhov <d...@chromium.org>
---
drivers/base/power/opp.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/drivers/base/power/opp.c b/drivers/base/power/opp.c
index d24dd614a..852eebf 100644
--- a/drivers/base/power/opp.c
+++ b/drivers/base/power/opp.c
@@ -218,6 +218,11 @@ int dev_pm_opp_get_opp_count(struct device *dev)
struct dev_pm_opp *temp_opp;
int count = 0;
+ rcu_lockdep_assert(rcu_read_lock_held() ||
+ lockdep_is_held(&dev_opp_list_lock),
+ "dev_pm_opp_get_opp_count() needs rcu_read_lock() "
+ "or dev_opp_list_lock protection");
+
dev_opp = find_device_opp(dev);
if (IS_ERR(dev_opp)) {
int r = PTR_ERR(dev_opp);
@@ -267,6 +272,11 @@ struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct
device *dev,
struct device_opp *dev_opp;
struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);
+ rcu_lockdep_assert(rcu_read_lock_held() ||
+ lockdep_is_held(&dev_opp_list_lock),
+ "dev_pm_opp_find_freq_exact() needs rcu_read_lock() "
+ "or dev_opp_list_lock protection");
+
dev_opp = find_device_opp(dev);
if (IS_ERR(dev_opp)) {
int r = PTR_ERR(dev_opp);
@@ -313,6 +323,11 @@ struct dev_pm_opp *dev_pm_opp_find_freq_ceil(struct device
*dev,
struct device_opp *dev_opp;
struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);
+ rcu_lockdep_assert(rcu_read_lock_held() ||
+ lockdep_is_held(&dev_opp_list_lock),
+ "dev_pm_opp_find_freq_ceil() needs rcu_read_lock() "
+ "or dev_opp_list_lock protection");
+
if (!dev || !freq) {
dev_err(dev, "%s: Invalid argument freq=%p\n", __func__, freq);
return ERR_PTR(-EINVAL);
@@ -361,6 +376,11 @@ struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct
device *dev,
struct device_opp *dev_opp;
struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);
+ rcu_lockdep_assert(rcu_read_lock_held() ||
+ lockdep_is_held(&dev_opp_list_lock),
+ "dev_pm_opp_find_freq_floor() needs rcu_read_lock() "
+ "or dev_opp_list_lock protection");
+
if (!dev || !freq) {
dev_err(dev, "%s: Invalid argument freq=%p\n", __func__, freq);
return ERR_PTR(-EINVAL);
--
2.2.0.rc0.207.ga3a616c
--
Dmitry
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