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From:   Nikita Yushchenko <nikita.yoush@cogentembedded.com>
To:     Andrew Lunn <andrew@lunn.ch>,
        Vivien Didelot <vivien.didelot@gmail.com>,
        Florian Fainelli <f.fainelli@gmail.com>
Cc:     "David S. Miller" <davem@davemloft.net>,
        Heiner Kallweit <hkallweit1@gmail.com>,
        =?UTF-8?q?Marek=20Beh=C3=BAn?= <marek.behun@nic.cz>,
        Russell King <rmk+kernel@armlinux.org.uk>,
        netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
        Chris Healy <cphealy@gmail.com>,
        Nikita Yushchenko <nikita.yoush@cogentembedded.com>
Subject: [PATCH] net: dsa: mv88e6xxx: avoid error message on remove from VLAN 0
Date:   Fri, 31 May 2019 10:27:07 +0300
Message-Id: <20190531072707.1755-1-nikita.yoush@cogentembedded.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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.
---
 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 28414db979b0..6b77fde5f0e4 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.c
+++ b/drivers/net/dsa/mv88e6xxx/chip.c
@@ -1392,7 +1392,7 @@ static int mv88e6xxx_vtu_get(struct mv88e6xxx_chip *chip, u16 vid,
 	int err;
 
 	if (!vid)
-		return -EINVAL;
+		return -EOPNOTSUPP;
 
 	entry->vid = vid - 1;
 	entry->valid = false;
-- 
2.11.0