net: dsa: Set valid phy interface type

If the phy interface mode is not found in devicetree, or if devicetree
is not configured, of_get_phy_mode returns -ENODEV. The current code
sets the phy interface mode to the return value from of_get_phy_mode
without checking if it is valid.

This invalid phy interface mode is passed as parameter to of_phy_connect
or to phy_connect_direct. This sets the phy interface mode to the invalid
value, which in turn causes problems for any code using phydev->interface.

Fixes: b31f65fb4383 ("net: dsa: slave: Fix autoneg for phys on switch MDIO bus")
Fixes: 0d8bcdd383b8 ("net: dsa: allow for more complex PHY setups")
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 2 deletions

diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index d104ae15836f..f23deadf42a0 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -521,10 +521,13 @@ static int dsa_slave_phy_setup(struct dsa_slave_priv *p,
         struct device_node *phy_dn, *port_dn;
         bool phy_is_fixed = false;
         u32 phy_flags = 0;
-        int ret;
+        int mode, ret;
 
         port_dn = cd->port_dn[p->port];
-        p->phy_interface = of_get_phy_mode(port_dn);
+        mode = of_get_phy_mode(port_dn);
+        if (mode < 0)
+                mode = PHY_INTERFACE_MODE_NA;
+        p->phy_interface = mode;
 
         phy_dn = of_parse_phandle(port_dn, "phy-handle", 0);
         if (of_phy_is_fixed_link(port_dn)) {
@@ -559,6 +562,8 @@ static int dsa_slave_phy_setup(struct dsa_slave_priv *p,
                 if (!p->phy)
                         return -ENODEV;
 
+                /* Use already configured phy mode */
+                p->phy_interface = p->phy->interface;
                 phy_connect_direct(slave_dev, p->phy, dsa_slave_adjust_link,
                                    p->phy_interface);
         } else {