[PATCH net] dibs: Unregister dibs_class after error

[Alexandra Winter]

In case dibs_loopback_init() fails, e.g. because of -ENOMEM, dibs_init()
must unregister dibs_class. Otherwise dibs_class and /sys/class/dibs exist
even though the functionality is not available. A retry to load the module
fails with -EEXIST.

Unregister dibs_class in the error path of dibs_init.

Note that before
commit ad3dfa80be76 ("dibs: change dibs_class to a const struct")
class_destroy(dibs_class) is required instead of
class_unregister(&dibs_class).

Fixes: 804737349813 ("dibs: Create class dibs")
Signed-off-by: Alexandra Winter <wintera@xxxxxxxxxxxxx>
---
 drivers/dibs/dibs_main.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/dibs/dibs_main.c b/drivers/dibs/dibs_main.c
index 2b53a9d277dc..20c50997a7cf 100644
--- a/drivers/dibs/dibs_main.c
+++ b/drivers/dibs/dibs_main.c
@@ -251,13 +251,19 @@ static int __init dibs_init(void)
 
 	rc = class_register(&dibs_class);
 	if (rc)
-		return rc;
+		goto err;
 
 	rc = dibs_loopback_init();
 	if (rc)
-		pr_err("%s fails with %d\n", __func__, rc);
+		goto err_unregister;
 
 	return rc;
+
+err_unregister:
+	class_unregister(&dibs_class);
+err:
+	pr_err("%s fails with %d\n", __func__, rc);
+	return rc;
 }
 
 static void __exit dibs_exit(void)
-- 
2.53.0