When df->governor is NULL, governor_show() returns -EINVAL, which
confuses users.

To fix this issue, return -ENOENT to indicate that no governor is
currently set for the device.

Signed-off-by: Yaxiong Tian <tianyaxiong@kylinos.cn>
---
 drivers/devfreq/devfreq.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
index 4a312f3c2421..7cc60711fafd 100644
--- a/drivers/devfreq/devfreq.c
+++ b/drivers/devfreq/devfreq.c
@@ -1412,7 +1412,7 @@ static ssize_t governor_show(struct device *dev,
 	struct devfreq *df = to_devfreq(dev);
 
 	if (!df->governor)
-		return -EINVAL;
+		return -ENOENT;
 
 	return sprintf(buf, "%s\n", df->governor->name);
 }
-- 
2.25.1