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authorViresh Kumar <viresh.kumar@linaro.org>2018-12-14 15:20:56 +0530
committerViresh Kumar <viresh.kumar@linaro.org>2018-12-14 16:28:12 +0530
commit2feb5a896c42fb24f6d6f7028574dc59bfc9306f (patch)
treee0d847757ce3c478f832202989f31fbf7ee545a5
parentc8a59103e22b191e363fc0a90e08515a915b278d (diff)
downloadlinux-2feb5a896c42fb24f6d6f7028574dc59bfc9306f.tar.bz2
OPP: Don't return 0 on error from of_get_required_opp_performance_state()
of_get_required_opp_performance_state() returns 0 on errors currently and a positive performance state otherwise. Since 0 is a valid performance state (representing off), it would be better if this routine returns negative values on error. That will also make it behave similar to dev_pm_opp_xlate_performance_state(), which also returns performance states and returns negative values on error. Change the return type of the function to "int" in order to return negative values. This doesn't have any users for now and so no other part of the kernel will be impacted with this change. Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
-rw-r--r--drivers/opp/of.c10
-rw-r--r--include/linux/pm_opp.h6
2 files changed, 8 insertions, 8 deletions
diff --git a/drivers/opp/of.c b/drivers/opp/of.c
index 7f09ae8fc050..fde324dd8c46 100644
--- a/drivers/opp/of.c
+++ b/drivers/opp/of.c
@@ -983,19 +983,19 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_of_get_sharing_cpus);
* Returns the performance state of the OPP pointed out by the "required-opps"
* property at @index in @np.
*
- * Return: Positive performance state on success, otherwise 0 on errors.
+ * Return: Zero or positive performance state on success, otherwise negative
+ * value on errors.
*/
-unsigned int of_get_required_opp_performance_state(struct device_node *np,
- int index)
+int of_get_required_opp_performance_state(struct device_node *np, int index)
{
struct dev_pm_opp *opp;
struct device_node *required_np;
struct opp_table *opp_table;
- unsigned int pstate = 0;
+ int pstate = -EINVAL;
required_np = of_parse_required_opp(np, index);
if (!required_np)
- return 0;
+ return -EINVAL;
opp_table = _find_table_of_opp_np(required_np);
if (IS_ERR(opp_table)) {
diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h
index 0b04c2093eb9..0a2a88e5a383 100644
--- a/include/linux/pm_opp.h
+++ b/include/linux/pm_opp.h
@@ -321,7 +321,7 @@ void dev_pm_opp_of_cpumask_remove_table(const struct cpumask *cpumask);
int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask);
struct device_node *dev_pm_opp_of_get_opp_desc_node(struct device *dev);
struct device_node *dev_pm_opp_get_of_node(struct dev_pm_opp *opp);
-unsigned int of_get_required_opp_performance_state(struct device_node *np, int index);
+int of_get_required_opp_performance_state(struct device_node *np, int index);
#else
static inline int dev_pm_opp_of_add_table(struct device *dev)
{
@@ -360,9 +360,9 @@ static inline struct device_node *dev_pm_opp_get_of_node(struct dev_pm_opp *opp)
{
return NULL;
}
-static inline unsigned int of_get_required_opp_performance_state(struct device_node *np, int index)
+static inline int of_get_required_opp_performance_state(struct device_node *np, int index)
{
- return 0;
+ return -ENOTSUPP;
}
#endif