linux-kernel - [PATCH v3 3/3] net: mscc: ocelot: add missing lock protection in ocelot_port_xmit

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Message-Id: <20260208225602.1339325-4-n7l8m4@u.northwestern.edu>
Date: Sun,  8 Feb 2026 22:56:02 +0000
From: Ziyi Guo <n7l8m4@...orthwestern.edu>
To: Vladimir Oltean <vladimir.oltean@....com>,
	Claudiu Manoil <claudiu.manoil@....com>,
	Alexandre Belloni <alexandre.belloni@...tlin.com>
Cc: UNGLinuxDriver@...rochip.com,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S . Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Ziyi Guo <n7l8m4@...orthwestern.edu>
Subject: [PATCH v3 3/3] net: mscc: ocelot: add missing lock protection in ocelot_port_xmit_inj()

ocelot_port_xmit_inj() calls ocelot_can_inject() and
ocelot_port_inject_frame() without holding the injection group lock.
Both functions contain lockdep_assert_held() for the injection lock,
and the correct caller felix_port_deferred_xmit() properly acquires
the lock using ocelot_lock_inj_grp() before calling these functions.

Add ocelot_lock_inj_grp()/ocelot_unlock_inj_grp() around the register
injection path to fix the missing lock protection. The FDMA path is not
affected as it uses its own locking mechanism.

Fixes: c5e12ac3beb0 ("net: mscc: ocelot: serialize access to the injection/extraction groups")
Signed-off-by: Ziyi Guo <n7l8m4@...orthwestern.edu>
---
 drivers/net/ethernet/mscc/ocelot_net.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mscc/ocelot_net.c b/drivers/net/ethernet/mscc/ocelot_net.c
index d6b0936beca2..9fd8ac7e875c 100644
--- a/drivers/net/ethernet/mscc/ocelot_net.c
+++ b/drivers/net/ethernet/mscc/ocelot_net.c
@@ -597,14 +597,22 @@ static netdev_tx_t ocelot_port_xmit_inj(struct sk_buff *skb,
 	int port = priv->port.index;
 	u32 rew_op = 0;
 
-	if (!ocelot_can_inject(ocelot, 0))
+	ocelot_lock_inj_grp(ocelot, 0);
+
+	if (!ocelot_can_inject(ocelot, 0)) {
+		ocelot_unlock_inj_grp(ocelot, 0);
 		return NETDEV_TX_BUSY;
+	}
 
-	if (!ocelot_xmit_timestamp(ocelot, port, skb, &rew_op))
+	if (!ocelot_xmit_timestamp(ocelot, port, skb, &rew_op)) {
+		ocelot_unlock_inj_grp(ocelot, 0);
 		return NETDEV_TX_OK;
+	}
 
 	ocelot_port_inject_frame(ocelot, port, 0, rew_op, skb);
 
+	ocelot_unlock_inj_grp(ocelot, 0);
+
 	consume_skb(skb);
 
 	return NETDEV_TX_OK;
-- 
2.34.1