linux-kernel - [PATCH] tcpm: allow looking for role

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Message-Id: <20251127-fix-ppp-power-v1-1-52cdd74c0ee6@collabora.com>
Date: Thu, 27 Nov 2025 15:04:15 +0100
From: Arnaud Ferraris <arnaud.ferraris@...labora.com>
To: Badhri Jagan Sridharan <badhri@...gle.com>, 
 Heikki Krogerus <heikki.krogerus@...ux.intel.com>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Michael Grzeschik <m.grzeschik@...gutronix.de>
Cc: linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org, 
 stable@...r.kernel.org, Arnaud Ferraris <arnaud.ferraris@...labora.com>
Subject: [PATCH] tcpm: allow looking for role_sw device in the main node

When ports are defined in the tcpc main node, fwnode_usb_role_switch_get
returns an error, meaning usb_role_switch_get (which would succeed)
never gets a chance to run as port->role_sw isn't NULL, causing a
regression on devices where this is the case.

Fix this by turning the NULL check into IS_ERR_OR_NULL, so
usb_role_switch_get can actually run and the device get properly probed.

Fixes: 2d8713f807a4 ("tcpm: switch check for role_sw device with fw_node")
Cc: stable@...r.kernel.org
Signed-off-by: Arnaud Ferraris <arnaud.ferraris@...labora.com>
---
 drivers/usb/typec/tcpm/tcpm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
index cc78770509dbc..37698204d48d2 100644
--- a/drivers/usb/typec/tcpm/tcpm.c
+++ b/drivers/usb/typec/tcpm/tcpm.c
@@ -7877,7 +7877,7 @@ struct tcpm_port *tcpm_register_port(struct device *dev, struct tcpc_dev *tcpc)
 	port->partner_desc.identity = &port->partner_ident;
 
 	port->role_sw = fwnode_usb_role_switch_get(tcpc->fwnode);
-	if (!port->role_sw)
+	if (IS_ERR_OR_NULL(port->role_sw))
 		port->role_sw = usb_role_switch_get(port->dev);
 	if (IS_ERR(port->role_sw)) {
 		err = PTR_ERR(port->role_sw);

---
base-commit: 765e56e41a5af2d456ddda6cbd617b9d3295ab4e
change-id: 20251127-fix-ppp-power-6d47f3a746f8

Best regards,
-- 
Arnaud Ferraris <arnaud.ferraris@...labora.com>