[PATCH next] net: dsa: print error on invalid port index

[Rafał Miłecki]

From: Rafał Miłecki <ra...@milecki.pl>

Looking for an -EINVAL all over the dsa code could take hours for
inexperienced DSA users.

Signed-off-by: Rafał Miłecki <ra...@milecki.pl>
---
 net/dsa/dsa2.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/dsa/dsa2.c b/net/dsa/dsa2.c
index 183003e45762..01f21b0b379a 100644
--- a/net/dsa/dsa2.c
+++ b/net/dsa/dsa2.c
@@ -783,6 +783,8 @@ static int dsa_switch_parse_ports_of(struct dsa_switch *ds,
                        goto out_put_node;
 
                if (reg >= ds->num_ports) {
+                       dev_err(ds->dev, "port %pOF index %u exceeds num_ports 
(%zu)\n",
+                               port, reg, ds->num_ports);
                        err = -EINVAL;
                        goto out_put_node;
                }
-- 
2.26.2