It's possible that dev_set_name() returns -ENOMEM. We could catch and
handle it by adding dev_set_name() return value check.

Cc: stable@vger.kernel.org
Fixes: 775fa8c3aa22 ("PM / devfreq: Simplify the sysfs name of devfreq-event device")
Signed-off-by: Ma Ke <make_ruc2021@163.com>
---
 drivers/devfreq/devfreq-event.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/devfreq/devfreq-event.c b/drivers/devfreq/devfreq-event.c
index 3ebac2496679..9479fbe71eda 100644
--- a/drivers/devfreq/devfreq-event.c
+++ b/drivers/devfreq/devfreq-event.c
@@ -328,7 +328,10 @@ struct devfreq_event_dev *devfreq_event_add_edev(struct device *dev,
 	edev->dev.class = devfreq_event_class;
 	edev->dev.release = devfreq_event_release_edev;
 
-	dev_set_name(&edev->dev, "event%d", atomic_inc_return(&event_no));
+	ret = dev_set_name(&edev->dev, "event%d", atomic_inc_return(&event_no));
+	if (ret)
+		return ERR_PTR(-ENOMEM);
+
 	ret = device_register(&edev->dev);
 	if (ret < 0) {
 		put_device(&edev->dev);
-- 
2.25.1

>It's possible that dev_set_name() returns -ENOMEM. We could catch and
>handle it by adding dev_set_name() return value check.
>
>Cc: stable@vger.kernel.org
>Fixes: 775fa8c3aa22 ("PM / devfreq: Simplify the sysfs name of devfreq-event device")
>Signed-off-by: Ma Ke <make_ruc2021@163.com>
>---
> drivers/devfreq/devfreq-event.c | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
>
>diff --git a/drivers/devfreq/devfreq-event.c b/drivers/devfreq/devfreq-event.c
>index 3ebac2496679..9479fbe71eda 100644
>--- a/drivers/devfreq/devfreq-event.c
>+++ b/drivers/devfreq/devfreq-event.c
>@@ -328,7 +328,10 @@ struct devfreq_event_dev *devfreq_event_add_edev(struct device *dev,
> 	edev->dev.class = devfreq_event_class;
> 	edev->dev.release = devfreq_event_release_edev;
> 
>-	dev_set_name(&edev->dev, "event%d", atomic_inc_return(&event_no));
>+	ret = dev_set_name(&edev->dev, "event%d", atomic_inc_return(&event_no));
>+	if (ret)
>+		return ERR_PTR(-ENOMEM);
>+

NACK.
1. edev is not handled.
2. although dev_set_name returns -ENOMEM or 0 today,
you don't know if it will return something else in the future.
Use what it has returned.

Cheers,
MyungJoo

> 	ret = device_register(&edev->dev);
> 	if (ret < 0) {
> 		put_device(&edev->dev);
>-- 
>2.25.1