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

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Date:   Wed,  6 Jan 2021 10:09:15 +0100
From:   Rafał Miłecki <zajec5@...il.com>
To:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        Rafał Miłecki <rafal@...ecki.pl>
Subject: [PATCH next] net: dsa: print error on invalid port index

From: Rafał Miłecki <rafal@...ecki.pl>

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

Signed-off-by: Rafał Miłecki <rafal@...ecki.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