net: dsa: propagate error code from dsa_slave_phy_setup

In case we cannot attach to our slave netdevice PHY, error out and
propagate that error up to the caller: dsa_slave_create().

Fixes: 0d8bcdd383b8 ("net: dsa: allow for more complex PHY setups")
Signed-off-by: Andrey Volkov <andrey.volkov@nexvision.fr>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 11 insertions, 4 deletions

diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index da64ba9d825d..515569ffde8a 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -512,7 +512,7 @@ static int dsa_slave_fixed_link_update(struct net_device *dev,
 }
 
 /* slave device setup *******************************************************/
-static void dsa_slave_phy_setup(struct dsa_slave_priv *p,
+static int dsa_slave_phy_setup(struct dsa_slave_priv *p,
                                 struct net_device *slave_dev)
 {
         struct dsa_switch *ds = p->parent;
@@ -533,7 +533,7 @@ static void dsa_slave_phy_setup(struct dsa_slave_priv *p,
                 ret = of_phy_register_fixed_link(port_dn);
                 if (ret) {
                         netdev_err(slave_dev, "failed to register fixed PHY\n");
-                        return;
+                        return ret;
                 }
                 phy_is_fixed = true;
                 phy_dn = port_dn;
@@ -556,7 +556,7 @@ static void dsa_slave_phy_setup(struct dsa_slave_priv *p,
         if (!p->phy) {
                 p->phy = ds->slave_mii_bus->phy_map[p->port];
                 if (!p->phy)
-                        return;
+                        return -ENODEV;
 
                 phy_connect_direct(slave_dev, p->phy, dsa_slave_adjust_link,
                                    p->phy_interface);
@@ -564,6 +564,8 @@ static void dsa_slave_phy_setup(struct dsa_slave_priv *p,
                 netdev_info(slave_dev, "attached PHY at address %d [%s]\n",
                             p->phy->addr, p->phy->drv->name);
         }
+
+        return 0;
 }
 
 int dsa_slave_suspend(struct net_device *slave_dev)
@@ -656,12 +658,17 @@ dsa_slave_create(struct dsa_switch *ds, struct device *parent,
         p->old_link = -1;
         p->old_duplex = -1;
 
-        dsa_slave_phy_setup(p, slave_dev);
+        ret = dsa_slave_phy_setup(p, slave_dev);
+        if (ret) {
+                free_netdev(slave_dev);
+                return NULL;
+        }
 
         ret = register_netdev(slave_dev);
         if (ret) {
                 netdev_err(master, "error %d registering interface %s\n",
                            ret, slave_dev->name);
+                phy_disconnect(p->phy);
                 free_netdev(slave_dev);
                 return NULL;
         }