netdev - [RFC 1/6] rtnetlink: fix alloc() method introduction

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Message-Id: <20210603044954.8091-2-ryazanov.s.a@gmail.com>
Date:   Thu,  3 Jun 2021 07:49:49 +0300
From:   Sergey Ryazanov <ryazanov.s.a@...il.com>
To:     Johannes Berg <johannes@...solutions.net>,
        Loic Poulain <loic.poulain@...aro.org>
Cc:     M Chetan Kumar <m.chetan.kumar@...el.com>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org
Subject: [RFC 1/6] rtnetlink: fix alloc() method introduction

RTNL checks for the setup() callback existing in a few place as a sanity
check. The introduction of the alloc() method makes the setup() method
optional. So allow RTNL families that define at least one alloc() or
setup() method.

Fixes: ???? ("rtnetlink: add alloc() method to rtnl_link_ops")
Signed-off-by: Sergey Ryazanov <ryazanov.s.a@...il.com>
---
 net/core/rtnetlink.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 49a27bf6e4a7..56ac16abe0ba 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -376,12 +376,12 @@ int __rtnl_link_register(struct rtnl_link_ops *ops)
 	if (rtnl_link_ops_get(ops->kind))
 		return -EEXIST;
 
-	/* The check for setup is here because if ops
+	/* The check for alloc/setup is here because if ops
 	 * does not have that filled up, it is not possible
 	 * to use the ops for creating device. So do not
 	 * fill up dellink as well. That disables rtnl_dellink.
 	 */
-	if (ops->setup && !ops->dellink)
+	if ((ops->alloc || ops->setup) && !ops->dellink)
 		ops->dellink = unregister_netdevice_queue;
 
 	list_add_tail(&ops->list, &link_ops);
@@ -3421,7 +3421,7 @@ static int __rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
 		return -EOPNOTSUPP;
 	}
 
-	if (!ops->setup)
+	if (!ops->alloc && !ops->setup)
 		return -EOPNOTSUPP;
 
 	if (!ifname[0]) {
-- 
2.26.3