While adding the logic for DSA to register a fixed-link PHY for the CPU
port, I forgot to pass it to the .port_disable method too, just
.port_enable.

Bug had no impact for felix_switch.c, due to the phy argument not being
used, but ksz9477.c does use it => NULL pointer dereference.

Fixes: fc054d563bfb ("net: Introduce DSA class for Ethernet switches")
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
---
 net/dsa-uclass.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/dsa-uclass.c b/net/dsa-uclass.c
index 9b8ae1e82b92..d1c6c78acd6c 100644
--- a/net/dsa-uclass.c
+++ b/net/dsa-uclass.c

@@ -100,7 +100,7 @@ static void dsa_port_stop(struct udevice *pdev)

                port_pdata = dev_get_parent_plat(pdev);
                ops->port_disable(dev, port_pdata->index, port_pdata->phy);
-               ops->port_disable(dev, priv->cpu_port, NULL);
+               ops->port_disable(dev, priv->cpu_port, priv->cpu_port_fixed_phy);
        }

        eth_get_ops(master)->stop(master);
--

2.25.1