linux-kernel - [PATCH AUTOSEL 4.9 08/18] net: dsa: mv88e6xxx: avoid error message on remove from VLAN 0

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Message-Id: <20190614203037.27910-8-sashal@kernel.org>
Date:   Fri, 14 Jun 2019 16:30:24 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Nikita Yushchenko <nikita.yoush@...entembedded.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>, netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 4.9 08/18] net: dsa: mv88e6xxx: avoid error message on remove from VLAN 0

From: Nikita Yushchenko <nikita.yoush@...entembedded.com>

[ Upstream commit 62394708f3e01c9f2be6be74eb6305bae1ed924f ]

When non-bridged, non-vlan'ed mv88e6xxx port is moving down, error
message is logged:

failed to kill vid 0081/0 for device eth_cu_1000_4

This is caused by call from __vlan_vid_del() with vin set to zero, over
call chain this results into _mv88e6xxx_port_vlan_del() called with
vid=0, and mv88e6xxx_vtu_get() called from there returns -EINVAL.

On symmetric path moving port up, call goes through
mv88e6xxx_port_vlan_prepare() that calls mv88e6xxx_port_check_hw_vlan()
that returns -EOPNOTSUPP for zero vid.

This patch changes mv88e6xxx_vtu_get() to also return -EOPNOTSUPP for
zero vid, then this error code is explicitly cleared in
dsa_slave_vlan_rx_kill_vid() and error message is no longer logged.

Signed-off-by: Nikita Yushchenko <nikita.yoush@...entembedded.com>
Reviewed-by: Vivien Didelot <vivien.didelot@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/dsa/mv88e6xxx/chip.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
index dc510069d37b..2edd193c96ab 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.c
+++ b/drivers/net/dsa/mv88e6xxx/chip.c
@@ -1742,7 +1742,7 @@ static int _mv88e6xxx_vtu_get(struct mv88e6xxx_chip *chip, u16 vid,
 	int err;

 	if (!vid)
-		return -EINVAL;
+		return -EOPNOTSUPP;

 	err = _mv88e6xxx_vtu_vid_write(chip, vid - 1);
 	if (err)
-- 
2.20.1