linux-kernel - [PATCH net v4 3/4] net: dsa: mxl-gsw1xx: fix .shutdown driver operation

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Message-ID: <77ed91a5206e5dbf5d3e83d7e364ebfda90d31fd.1765241054.git.daniel@makrotopia.org>
Date: Tue, 9 Dec 2025 01:29:05 +0000
From: Daniel Golle <daniel@...rotopia.org>
To: Hauke Mehrtens <hauke@...ke-m.de>, Andrew Lunn <andrew@...n.ch>,
	Vladimir Oltean <olteanv@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Russell King <linux@...linux.org.uk>,
	Daniel Golle <daniel@...rotopia.org>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Rasmus Villemoes <ravi@...vas.dk>,
	"Benny (Ying-Tsan) Weng" <yweng@...linear.com>,
	John Crispin <john@...ozen.org>
Subject: [PATCH net v4 3/4] net: dsa: mxl-gsw1xx: fix .shutdown driver
 operation

The .shutdown operation should call dsa_switch_shutdown() just like
it is done also by the sibling lantiq_gswip driver. Not doing that
results in shutdown or reboot hanging and waiting for the CPU port
becoming free, which introduces a longer delay and a WARNING before
shutdown or reboot in case the driver is built-into the kernel.
Fix this by calling dsa_switch_shutdown() in the driver's shutdown
operation, harmonizing it with what is done in the lantiq_gswip
driver. As a side-effect this now allows to remove the previously
exported gswip_disable_switch() function which no longer got any
users.

Fixes: 22335939ec907 ("net: dsa: add driver for MaxLinear GSW1xx switch family")
Signed-off-by: Daniel Golle <daniel@...rotopia.org>
---
v4: initial submission, not present in previous versions

 drivers/net/dsa/lantiq/lantiq_gswip.h        | 2 --
 drivers/net/dsa/lantiq/lantiq_gswip_common.c | 6 ------
 drivers/net/dsa/lantiq/mxl-gsw1xx.c          | 4 ++--
 3 files changed, 2 insertions(+), 10 deletions(-)

diff --git a/drivers/net/dsa/lantiq/lantiq_gswip.h b/drivers/net/dsa/lantiq/lantiq_gswip.h
index 9c38e51a75e80..2e0f2afbadbbc 100644
--- a/drivers/net/dsa/lantiq/lantiq_gswip.h
+++ b/drivers/net/dsa/lantiq/lantiq_gswip.h
@@ -294,8 +294,6 @@ struct gswip_priv {
 	u16 version;
 };
 
-void gswip_disable_switch(struct gswip_priv *priv);
-
 int gswip_probe_common(struct gswip_priv *priv, u32 version);
 
 #endif /* __LANTIQ_GSWIP_H */
diff --git a/drivers/net/dsa/lantiq/lantiq_gswip_common.c b/drivers/net/dsa/lantiq/lantiq_gswip_common.c
index 6b171d58e1862..e790f2ef75884 100644
--- a/drivers/net/dsa/lantiq/lantiq_gswip_common.c
+++ b/drivers/net/dsa/lantiq/lantiq_gswip_common.c
@@ -1664,12 +1664,6 @@ static const struct dsa_switch_ops gswip_switch_ops = {
 	.port_hsr_leave		= dsa_port_simple_hsr_leave,
 };
 
-void gswip_disable_switch(struct gswip_priv *priv)
-{
-	regmap_clear_bits(priv->mdio, GSWIP_MDIO_GLOB, GSWIP_MDIO_GLOB_ENABLE);
-}
-EXPORT_SYMBOL_GPL(gswip_disable_switch);
-
 static int gswip_validate_cpu_port(struct dsa_switch *ds)
 {
 	struct gswip_priv *priv = ds->priv;
diff --git a/drivers/net/dsa/lantiq/mxl-gsw1xx.c b/drivers/net/dsa/lantiq/mxl-gsw1xx.c
index cda966d71e889..4dc287ad141e1 100644
--- a/drivers/net/dsa/lantiq/mxl-gsw1xx.c
+++ b/drivers/net/dsa/lantiq/mxl-gsw1xx.c
@@ -662,9 +662,9 @@ static void gsw1xx_shutdown(struct mdio_device *mdiodev)
 	if (!priv)
 		return;
 
-	dev_set_drvdata(&mdiodev->dev, NULL);
+	dsa_switch_shutdown(priv->ds);
 
-	gswip_disable_switch(priv);
+	dev_set_drvdata(&mdiodev->dev, NULL);
 }
 
 static const struct gswip_hw_info gsw12x_data = {
-- 
2.52.0