netdev - [PATCH 1/1] net: dsa: Fix type was not set for devlink port

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Date:   Mon, 29 Mar 2021 18:30:16 +0300
From:   Maxim Kochetkov <fido_max@...ox.ru>
To:     unlisted-recipients:; (no To-header on input)
Cc:     andrew@...n.ch, vivien.didelot@...il.com, f.fainelli@...il.com,
        olteanv@...il.com, davem@...emloft.net, kuba@...nel.org,
        netdev@...r.kernel.org, Maxim Kochetkov <fido_max@...ox.ru>
Subject: [PATCH 1/1] net: dsa: Fix type was not set for devlink port

If PHY is not available on DSA port (described at devicetree but absent or
failed to detect) then kernel prints warning after 3700 secs:

[ 3707.948771] ------------[ cut here ]------------
[ 3707.948784] Type was not set for devlink port.
[ 3707.948894] WARNING: CPU: 1 PID: 17 at net/core/devlink.c:8097 0xc083f9d8

We should unregister the devlink port as a user port and
re-register it as an unused port before executing "continue" in case of
dsa_port_setup error.

Fixes: 86f8b1c01a0a ("net: dsa: Do not make user port errors fatal")
Signed-off-by: Maxim Kochetkov <fido_max@...ox.ru>
---
 net/dsa/dsa2.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/net/dsa/dsa2.c b/net/dsa/dsa2.c
index d142eb2b288b..3c3e56a1f34d 100644
--- a/net/dsa/dsa2.c
+++ b/net/dsa/dsa2.c
@@ -795,8 +795,14 @@ static int dsa_tree_setup_switches(struct dsa_switch_tree *dst)
 
 	list_for_each_entry(dp, &dst->ports, list) {
 		err = dsa_port_setup(dp);
-		if (err)
+		if (err) {
+			dsa_port_devlink_teardown(dp);
+			dp->type = DSA_PORT_TYPE_UNUSED;
+			err = dsa_port_devlink_setup(dp);
+			if (err)
+				goto teardown;
 			continue;
+		}
 	}
 
 	return 0;
-- 
2.30.2