linux-kernel - [PATCH] net: dsa: tag_ocelot

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Message-ID: <20241211124657.1357330-1-robert.hodaszi@digi.com>
Date: Wed, 11 Dec 2024 13:46:56 +0100
From: Robert Hodaszi <robert.hodaszi@...i.com>
To: netdev@...r.kernel.org,
	vladimir.oltean@....com,
	claudiu.manoil@....com,
	alexandre.belloni@...tlin.com,
	UNGLinuxDriver@...rochip.com,
	andrew@...n.ch,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	horms@...nel.org,
	linux-kernel@...r.kernel.org
Cc: Robert Hodaszi <robert.hodaszi@...i.com>,
	stable@...r.kernel.org
Subject: [PATCH] net: dsa: tag_ocelot_8021q: fix broken reception

Commit dcfe7673787b4bfea2c213df443d312aa754757b ("net: dsa: tag_sja1105:
absorb logic for not overwriting precise info into dsa_8021q_rcv()")
added support to let the DSA switch driver set source_port and
switch_id. tag_8021q's logic overrides the previously set source_port
and switch_id only if they are marked as "invalid" (-1). sja1105 and
vsc73xx drivers are doing that properly, but ocelot_8021q driver doesn't
initialize those variables. That causes dsa_8021q_rcv() doesn't set
them, and they remain unassigned.

Initialize them as invalid to so dsa_8021q_rcv() can return with the
proper values.

Signed-off-by: Robert Hodaszi <robert.hodaszi@...i.com>
Cc: stable@...r.kernel.org
---
 net/dsa/tag_ocelot_8021q.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/dsa/tag_ocelot_8021q.c b/net/dsa/tag_ocelot_8021q.c
index 8e8b1bef6af6..11ea8cfd6266 100644
--- a/net/dsa/tag_ocelot_8021q.c
+++ b/net/dsa/tag_ocelot_8021q.c
@@ -79,7 +79,7 @@ static struct sk_buff *ocelot_xmit(struct sk_buff *skb,
 static struct sk_buff *ocelot_rcv(struct sk_buff *skb,
 				  struct net_device *netdev)
 {
-	int src_port, switch_id;
+	int src_port = -1, switch_id = -1;

 	dsa_8021q_rcv(skb, &src_port, &switch_id, NULL, NULL);

-- 
2.43.0