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From:   Oleksij Rempel <o.rempel@pengutronix.de>
To:     Andrew Lunn <andrew@lunn.ch>,
        Florian Fainelli <f.fainelli@gmail.com>,
        Vivien Didelot <vivien.didelot@gmail.com>,
        Vladimir Oltean <olteanv@gmail.com>,
        "David S. Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>
Cc:     Oleksij Rempel <o.rempel@pengutronix.de>, kernel@pengutronix.de,
        netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
        Russell King <linux@armlinux.org.uk>
Subject: [PATCH net-next v1] net: dsa: fix bridge support for drivers without port_bridge_flags callback
Date:   Wed, 21 Apr 2021 15:05:40 +0200
Message-Id: <20210421130540.12522-1-o.rempel@pengutronix.de>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

Starting with patch:
a8b659e7ff75 ("net: dsa: act as passthrough for bridge port flags")

drivers without "port_bridge_flags" callback will fail to join the bridge.
Looking at the code, -EOPNOTSUPP seems to be the proper return value,
which makes at least microchip and atheros switches work again.

Fixes: a8b659e7ff75 ("net: dsa: act as passthrough for bridge port flags")
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
---
 net/dsa/port.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/dsa/port.c b/net/dsa/port.c
index 01e30264b25b..6379d66a6bb3 100644
--- a/net/dsa/port.c
+++ b/net/dsa/port.c
@@ -550,7 +550,7 @@ int dsa_port_bridge_flags(const struct dsa_port *dp,
 	struct dsa_switch *ds = dp->ds;
 
 	if (!ds->ops->port_bridge_flags)
-		return -EINVAL;
+		return -EOPNOTSUPP;
 
 	return ds->ops->port_bridge_flags(ds, dp->index, flags, extack);
 }
-- 
2.29.2