netdev - [PATCH net-next 2/2] net: rtnl: use rcu_replace_pointer_rtnl in rtnl_unregister

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Date: Fri, 15 Dec 2023 14:57:11 -0300
From: Pedro Tammela <pctammela@...atatu.com>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	horms@...nel.org,
	jiri@...nulli.us,
	jhs@...atatu.com,
	victor@...atatu.com,
	martin@...ongswan.org,
	idosch@...dia.com,
	razor@...ckwall.org,
	lucien.xin@...il.com,
	edwin.peer@...adcom.com,
	amcohen@...dia.com,
	Pedro Tammela <pctammela@...atatu.com>
Subject: [PATCH net-next 2/2] net: rtnl: use rcu_replace_pointer_rtnl in rtnl_unregister_*

With the introduction of the rcu_replace_pointer_rtnl helper,
cleanup the rtnl_unregister_* functions to use the helper instead
of open coding it.

Signed-off-by: Pedro Tammela <pctammela@...atatu.com>
---
 net/core/rtnetlink.c | 12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 5e0ab4c08f72..94c4572512b8 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -342,8 +342,7 @@ int rtnl_unregister(int protocol, int msgtype)
 		return -ENOENT;
 	}
 
-	link = rtnl_dereference(tab[msgindex]);
-	RCU_INIT_POINTER(tab[msgindex], NULL);
+	link = rcu_replace_pointer_rtnl(tab[msgindex], NULL);
 	rtnl_unlock();
 
 	kfree_rcu(link, rcu);
@@ -368,18 +367,13 @@ void rtnl_unregister_all(int protocol)
 	BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
 
 	rtnl_lock();
-	tab = rtnl_dereference(rtnl_msg_handlers[protocol]);
+	tab = rcu_replace_pointer_rtnl(rtnl_msg_handlers[protocol], NULL);
 	if (!tab) {
 		rtnl_unlock();
 		return;
 	}
-	RCU_INIT_POINTER(rtnl_msg_handlers[protocol], NULL);
 	for (msgindex = 0; msgindex < RTM_NR_MSGTYPES; msgindex++) {
-		link = rtnl_dereference(tab[msgindex]);
-		if (!link)
-			continue;
-
-		RCU_INIT_POINTER(tab[msgindex], NULL);
+		link = rcu_replace_pointer_rtnl(tab[msgindex], NULL);
 		kfree_rcu(link, rcu);
 	}
 	rtnl_unlock();
-- 
2.40.1