net: dsa: allow deferred probing

In preparation for allowing a different model to register DSA switches,
update dsa_of_probe() and dsa_probe() to return -EPROBE_DEFER where
appropriate.

Failure to find a phandle or Device Tree property is still fatal, but
looking up the internal device structure associated with a Device Tree
node is something that might need to be delayed based on driver probe
ordering.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 3 deletions

diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
index d804364150bd..79879d01488a 100644
--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -583,7 +583,7 @@ static int dsa_of_probe(struct device *dev)
 
         mdio_bus = of_mdio_find_bus(mdio);
         if (!mdio_bus)
-                return -EINVAL;
+                return -EPROBE_DEFER;
 
         ethernet = of_parse_phandle(np, "dsa,ethernet", 0);
         if (!ethernet)
@@ -591,7 +591,7 @@ static int dsa_of_probe(struct device *dev)
 
         ethernet_dev = of_find_device_by_node(ethernet);
         if (!ethernet_dev)
-                return -ENODEV;
+                return -EPROBE_DEFER;
 
         pd = kzalloc(sizeof(*pd), GFP_KERNEL);
         if (!pd)
@@ -718,7 +718,7 @@ static int dsa_probe(struct platform_device *pdev)
 
         dev = dev_to_net_device(pd->netdev);
         if (dev == NULL) {
-                ret = -EINVAL;
+                ret = -EPROBE_DEFER;
                 goto out;
         }