net: dsa: slave: fix of-node leak and phy priority

Make sure to drop the reference taken by of_parse_phandle() before
returning from dsa_slave_phy_setup().

Note that this also modifies the PHY priority so that any fixed-link
node is only parsed when no phy-handle is given, which is in accordance
with the common scheme for this.

Fixes: 0d8bcdd383b8 ("net: dsa: allow for more complex PHY setups")
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 2 deletions

diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index 6b1282c006b1..2a5c20a13fe4 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -1125,7 +1125,7 @@ static int dsa_slave_phy_setup(struct dsa_slave_priv *p,
         p->phy_interface = mode;
 
         phy_dn = of_parse_phandle(port_dn, "phy-handle", 0);
-        if (of_phy_is_fixed_link(port_dn)) {
+        if (!phy_dn && of_phy_is_fixed_link(port_dn)) {
                 /* In the case of a fixed PHY, the DT node associated
                  * to the fixed PHY is the Port DT node
                  */
@@ -1135,7 +1135,7 @@ static int dsa_slave_phy_setup(struct dsa_slave_priv *p,
                         return ret;
                 }
                 phy_is_fixed = true;
-                phy_dn = port_dn;
+                phy_dn = of_node_get(port_dn);
         }
 
         if (ds->ops->get_phy_flags)
@@ -1154,6 +1154,7 @@ static int dsa_slave_phy_setup(struct dsa_slave_priv *p,
                         ret = dsa_slave_phy_connect(p, slave_dev, phy_id);
                         if (ret) {
                                 netdev_err(slave_dev, "failed to connect to phy%d: %d\n", phy_id, ret);
+                                of_node_put(phy_dn);
                                 return ret;
                         }
                 } else {
@@ -1162,6 +1163,8 @@ static int dsa_slave_phy_setup(struct dsa_slave_priv *p,
                                                 phy_flags,
                                                 p->phy_interface);
                 }
+
+                of_node_put(phy_dn);
         }
 
         if (p->phy && phy_is_fixed)