linux-kernel - [PATCH net v5 10/10] Revert "ipv6: Fix suspicious RCU usage warning in ip6mr"

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Message-ID: <20241014151247.1902637-11-stefan.wiehler@nokia.com>
Date: Mon, 14 Oct 2024 17:05:56 +0200
From: Stefan Wiehler <stefan.wiehler@...ia.com>
To: "David S . Miller" <davem@...emloft.net>,
	David Ahern <dsahern@...nel.org>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Stefan Wiehler <stefan.wiehler@...ia.com>
Subject: [PATCH net v5 10/10] Revert "ipv6: Fix suspicious RCU usage warning in ip6mr"

This reverts commit b6dd5acde3f165e364881c36de942c5b252e2a27.

We should not suppress Lockdep-RCU splats when calling ip6mr_get_table()
without RCU or RTNL lock.

Signed-off-by: Stefan Wiehler <stefan.wiehler@...ia.com>
---
 net/ipv6/ip6mr.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c
index 01b58156e06a..e52abedafc9e 100644
--- a/net/ipv6/ip6mr.c
+++ b/net/ipv6/ip6mr.c
@@ -105,8 +105,7 @@ static void ipmr_expire_process(struct timer_list *t);
 #ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
 #define ip6mr_for_each_table(mrt, net) \
 	list_for_each_entry_rcu(mrt, &net->ipv6.mr6_tables, list, \
-				lockdep_rtnl_is_held() || \
-				list_empty(&net->ipv6.mr6_tables))
+				lockdep_rtnl_is_held())
 
 static struct mr_table *ip6mr_mr_table_iter(struct net *net,
 					    struct mr_table *mrt)
-- 
2.42.0