linux-kernel - [PATCH 5.10 128/663] net: dsa: felix: dont deinitialize unused ports

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Message-Id: <20210301161148.080490383@linuxfoundation.org>
Date:   Mon,  1 Mar 2021 17:06:16 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Vladimir Oltean <vladimir.oltean@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.10 128/663] net: dsa: felix: dont deinitialize unused ports

From: Vladimir Oltean <vladimir.oltean@....com>

[ Upstream commit 42b5adbbac03bdb396192316c015fa3e64ffd5a1 ]

ocelot_init_port is called only if dsa_is_unused_port == false, however
ocelot_deinit_port is called unconditionally. This causes a warning in
the skb_queue_purge inside ocelot_deinit_port saying that the spin lock
protecting ocelot_port->tx_skbs was not initialized.

Fixes: e5fb512d81d0 ("net: mscc: ocelot: deinitialize only initialized ports")
Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/dsa/ocelot/felix.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/net/dsa/ocelot/felix.c b/drivers/net/dsa/ocelot/felix.c
index 7e506a1d8b2ff..4e53464411edf 100644
--- a/drivers/net/dsa/ocelot/felix.c
+++ b/drivers/net/dsa/ocelot/felix.c
@@ -638,8 +638,12 @@ static void felix_teardown(struct dsa_switch *ds)
 	ocelot_deinit_timestamp(ocelot);
 	ocelot_deinit(ocelot);
 
-	for (port = 0; port < ocelot->num_phys_ports; port++)
+	for (port = 0; port < ocelot->num_phys_ports; port++) {
+		if (dsa_is_unused_port(ds, port))
+			continue;
+
 		ocelot_deinit_port(ocelot, port);
+	}
 
 	if (felix->info->mdio_bus_free)
 		felix->info->mdio_bus_free(ocelot);
-- 
2.27.0