linux-kernel - [PATCH 3.16 227/305] team: no need to do team_notify_peers or team_mcast

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Message-ID: <lsq.1549201508.295309709@decadent.org.uk>
Date:   Sun, 03 Feb 2019 14:45:08 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "David S. Miller" <davem@...emloft.net>,
        "Hangbin Liu" <liuhangbin@...il.com>, "Liang Li" <liali@...hat.com>
Subject: [PATCH 3.16 227/305] team: no need to do team_notify_peers or
 team_mcast_rejoin when disabling port

3.16.63-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Hangbin Liu <liuhangbin@...il.com>

commit 5ed9dc99107144f83b6c1bb52a69b58875baf540 upstream.

team_notify_peers() will send ARP and NA to notify peers. team_mcast_rejoin()
will send multicast join group message to notify peers. We should do this when
enabling/changed to a new port. But it doesn't make sense to do it when a port
is disabled.

On the other hand, when we set mcast_rejoin_count to 2, and do a failover,
team_port_disable() will increase mcast_rejoin.count_pending to 2 and then
team_port_enable() will increase mcast_rejoin.count_pending to 4. We will send
4 mcast rejoin messages at latest, which will make user confused. The same
with notify_peers.count.

Fix it by deleting team_notify_peers() and team_mcast_rejoin() in
team_port_disable().

Reported-by: Liang Li <liali@...hat.com>
Fixes: fc423ff00df3a ("team: add peer notification")
Fixes: 492b200efdd20 ("team: add support for sending multicast rejoins")
Signed-off-by: Hangbin Liu <liuhangbin@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/net/team/team.c | 2 --
 1 file changed, 2 deletions(-)

--- a/drivers/net/team/team.c
+++ b/drivers/net/team/team.c
@@ -978,8 +978,6 @@ static void team_port_disable(struct tea
 	team->en_port_count--;
 	team_queue_override_port_del(team, port);
 	team_adjust_ops(team);
-	team_notify_peers(team);
-	team_mcast_rejoin(team);
 }

 #define TEAM_VLAN_FEATURES (NETIF_F_ALL_CSUM | NETIF_F_SG | \