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authorViresh Kumar <viresh.kumar@linaro.org>2015-11-05 14:21:21 +0530
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2015-11-06 23:59:42 +0100
commit0597e818501f595090a49a1779ab6ec377051b11 (patch)
treec533619d73d101302533e476b51dd8935385d820 /drivers/base
parent4a3a1353a84796f93d389694e3b87ede533953fe (diff)
PM / OPP: Add opp_rcu_lockdep_assert() to _find_device_opp()
_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. Suggested-by: Stephen Boyd <sboyd@codeaurora.org> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/base')
-rw-r--r--drivers/base/power/opp/core.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/drivers/base/power/opp/core.c b/drivers/base/power/opp/core.c
index d5f215679820..c987d2e1a83b 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);