linux-kernel - [RFC PATCH net-next v2 05/10] net: dsa: b53: prevent DIS

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Message-Id: <20250603204858.72402-6-noltari@gmail.com>
Date: Tue,  3 Jun 2025 22:48:53 +0200
From: Álvaro Fernández Rojas <noltari@...il.com>
To: jonas.gorski@...il.com,
	florian.fainelli@...adcom.com,
	andrew@...n.ch,
	olteanv@...il.com,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	vivien.didelot@...il.com,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	dgcbueu@...il.com
Cc: Álvaro Fernández Rojas <noltari@...il.com>
Subject: [RFC PATCH net-next v2 05/10] net: dsa: b53: prevent DIS_LEARNING access on BCM5325

BCM5325 doesn't implement DIS_LEARNING register so we should avoid reading
or writing it.

Fixes: f9b3827ee66c ("net: dsa: b53: Support setting learning on port")
Signed-off-by: Álvaro Fernández Rojas <noltari@...il.com>
---
 drivers/net/dsa/b53/b53_common.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

 v2: add changes proposed by Vladimir:
  - Disallow BR_LEARNING on b53_br_flags_pre() for BCM5325.

diff --git a/drivers/net/dsa/b53/b53_common.c b/drivers/net/dsa/b53/b53_common.c
index f1e82a0e84ea9..143c213a1992c 100644
--- a/drivers/net/dsa/b53/b53_common.c
+++ b/drivers/net/dsa/b53/b53_common.c
@@ -592,6 +592,9 @@ static void b53_port_set_learning(struct b53_device *dev, int port,
 {
 	u16 reg;
 
+	if (is5325(dev))
+		return;
+
 	b53_read16(dev, B53_CTRL_PAGE, B53_DIS_LEARNING, &reg);
 	if (learning)
 		reg &= ~BIT(port);
@@ -2264,7 +2267,13 @@ int b53_br_flags_pre(struct dsa_switch *ds, int port,
 		     struct switchdev_brport_flags flags,
 		     struct netlink_ext_ack *extack)
 {
-	if (flags.mask & ~(BR_FLOOD | BR_MCAST_FLOOD | BR_LEARNING))
+	struct b53_device *dev = ds->priv;
+	unsigned long mask = (BR_FLOOD | BR_MCAST_FLOOD);
+
+	if (!is5325(dev))
+		mask |= BR_LEARNING;
+
+	if (flags.mask & ~mask)
 		return -EINVAL;
 
 	return 0;
-- 
2.39.5