[PATCH] chardev: fix error handling in cdev_device_add()

[Yang Yingliang]

If dev->devt is not set, cdev_device_add() will not add the cdev,
when device_add failed, cdev_del() is not needed, so delete cdev
only when dev->devt is set.

Reported-by: Hulk Robot <hulkci@xxxxxxxxxx>
Fixes: 233ed09d7fda ("chardev: add helper function to register...")
Signed-off-by: Yang Yingliang <yangyingliang@xxxxxxxxxx>
---
 fs/char_dev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/char_dev.c b/fs/char_dev.c
index ba0ded7842a7..3f667292608c 100644
--- a/fs/char_dev.c
+++ b/fs/char_dev.c
@@ -547,7 +547,7 @@ int cdev_device_add(struct cdev *cdev, struct device *dev)
 	}
 
 	rc = device_add(dev);
-	if (rc)
+	if (rc && dev->devt)
 		cdev_del(cdev);
 
 	return rc;
-- 
2.25.1