[PATCH 1/4] net: dsa: return early if there is no master

[Michael Walle <michael@walle.cc>]

It doesn't make sense to have DSA without a master port. Error out early
if there is no master port.

Fixes: fc054d563bfb ("net: Introduce DSA class for Ethernet switches")
Signed-off-by: Michael Walle <michael@walle.cc>
Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.com>
---
 net/dsa-uclass.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/net/dsa-uclass.c b/net/dsa-uclass.c
index 2ce9ddb90d..88a8ea9352 100644
--- a/net/dsa-uclass.c
+++ b/net/dsa-uclass.c
@@ -280,6 +280,10 @@ static int dsa_port_probe(struct udevice *pdev)
 	if (!port_pdata->phy)
 		return -ENODEV;
 
+	master = dsa_get_master(dev);
+	if (!master)
+		return -ENODEV;
+
 	/*
 	 * Inherit port's hwaddr from the DSA master, unless the port already
 	 * has a unique MAC address specified in the environment.
@@ -288,10 +292,6 @@ static int dsa_port_probe(struct udevice *pdev)
 	if (!is_zero_ethaddr(env_enetaddr))
 		return 0;
 
-	master = dsa_get_master(dev);
-	if (!master)
-		return 0;
-
 	master_pdata = dev_get_plat(master);
 	eth_pdata = dev_get_plat(pdev);
 	memcpy(eth_pdata->enetaddr, master_pdata->enetaddr, ARP_HLEN);
-- 
2.20.1