[patch net-next 1/2] rtnetlink: allow to register ops without ops->setup set

[Jiri Pirko <jiri@resnulli.us>]

So far, it is assumed that ops->setup is filled up. But there might be
case that ops might make sense even without ->setup. In that case,
forbid to newlink and dellink.

Signed-off-by: Jiri Pirko <jiri@resnulli.us>
---
 net/core/rtnetlink.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 1063996..84affd7 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -1777,7 +1777,7 @@ static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh)
 		return -ENODEV;
 
 	ops = dev->rtnl_link_ops;
-	if (!ops)
+	if (!ops || !ops->setup)
 		return -EOPNOTSUPP;
 
 	ops->dellink(dev, &list_kill);
@@ -2038,6 +2038,9 @@ replay:
 			return -EOPNOTSUPP;
 		}
 
+		if (!ops->setup)
+			return -EOPNOTSUPP;
+
 		if (!ifname[0])
 			snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
 
-- 
1.9.0