netdev - [PATCH 4/9] net: bridge: mcast: track active state, own MLD querier disappearance

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Message-ID: <20250829085724.24230-5-linus.luessing@c0d3.blue>
Date: Fri, 29 Aug 2025 10:53:45 +0200
From: Linus Lüssing <linus.luessing@...3.blue>
To: bridge@...ts.linux.dev
Cc: netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Nikolay Aleksandrov <razor@...ckwall.org>,
	Ido Schimmel <idosch@...dia.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	Simon Horman <horms@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Eric Dumazet <edumazet@...gle.com>,
	"David S . Miller" <davem@...emloft.net>,
	Kuniyuki Iwashima <kuniyu@...gle.com>,
	Stanislav Fomichev <sdf@...ichev.me>,
	Xiao Liang <shaw.leon@...il.com>,
	Linus Lüssing <linus.luessing@...3.blue>
Subject: [PATCH 4/9] net: bridge: mcast: track active state, own MLD querier disappearance

This change ensures that the new multicast active state variable is
immediately unset if our internal IGMP/MLD querier was elected and
now disabled.

If no IGMP/MLD querier exists on the link then we can't reliably receive
IGMP/MLD reports and in turn can't ensure the completeness of our MDB
anymore either.

No functional change for the fast/data path yet. This is the last
necessary check before using the new multicast active state variable
in the fast/data path, too.

Signed-off-by: Linus Lüssing <linus.luessing@...3.blue>
---
 net/bridge/br_multicast.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index b689e62b9e74..13840f8f2e5f 100644
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -4849,6 +4849,7 @@ int br_multicast_set_querier(struct net_bridge_mcast *brmctx, unsigned long val)
 #endif
 
 unlock:
+	br_multicast_update_active(brmctx);
 	spin_unlock_bh(&brmctx->br->multicast_lock);
 
 	return 0;
-- 
2.50.1