netdev - [PATCH net-next] net: dsa: Deal with non-existing PHY/fixed-link

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Date:   Mon, 10 Jun 2019 12:31:49 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     netdev@...r.kernel.org
Cc:     ioana.ciornei@....com, olteanv@...il.com,
        rmk+kernel@...linux.org.uk,
        Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH net-next] net: dsa: Deal with non-existing PHY/fixed-link

We need to specifically deal with phylink_of_phy_connect() returning
-ENODEV, because this can happen when a CPU/DSA port does connect
neither to a PHY, nor has a fixed-link property. This is a valid use
case that is permitted by the binding and indicates to the switch:
auto-configure port with maximum capabilities.

Fixes: 0e27921816ad ("net: dsa: Use PHYLINK for the CPU/DSA ports")
Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
---
 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 d74bc9df1359..dde3085ff065 100644
--- a/net/dsa/port.c
+++ b/net/dsa/port.c
@@ -622,7 +622,7 @@ static int dsa_port_phylink_register(struct dsa_port *dp)
 	}
 
 	err = phylink_of_phy_connect(dp->pl, port_dn, 0);
-	if (err) {
+	if (err && err != -ENODEV) {
 		pr_err("could not attach to PHY: %d\n", err);
 		goto err_phy_connect;
 	}
-- 
2.17.1