linux-kernel - [PATCH 5.10 121/188] net: dsa: Fix type was not set for devlink port

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Message-Id: <20210412084017.672721816@linuxfoundation.org>
Date:   Mon, 12 Apr 2021 10:40:35 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Maxim Kochetkov <fido_max@...ox.ru>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.10 121/188] net: dsa: Fix type was not set for devlink port

From: Maxim Kochetkov <fido_max@...ox.ru>

[ Upstream commit fb6ec87f7229b92baa81b35cbc76f2626d5bfadb ]

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>
Reviewed-by: Vladimir Oltean <olteanv@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 a04fd637b4cd..3ada338d7e08 100644
--- a/net/dsa/dsa2.c
+++ b/net/dsa/dsa2.c
@@ -533,8 +533,14 @@ 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