linux-kernel - [PATCH 5.13 173/223] usb: typec: tipd: Dont block probing of consumer of "connector" nodes

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Date:   Mon, 26 Jul 2021 17:39:25 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Martin Kepplinger <martin.kepplinger@...i.sm>
Subject: [PATCH 5.13 173/223] usb: typec: tipd: Dont block probing of consumer of "connector" nodes

From: Martin Kepplinger <martin.kepplinger@...i.sm>

commit 57560ee95cb7f91cf0bc31d4ae8276e0dcfe17aa upstream.

Similar as with tcpm this patch lets fw_devlink know not to wait on the
fwnode to be populated as a struct device.

Without this patch, USB functionality can be broken on some previously
supported boards.

Fixes: 28ec344bb891 ("usb: typec: tcpm: Don't block probing of consumers of "connector" nodes")
Cc: stable <stable@...r.kernel.org>
Acked-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Signed-off-by: Martin Kepplinger <martin.kepplinger@...i.sm>
Link: https://lore.kernel.org/r/20210714061807.5737-1-martin.kepplinger@puri.sm
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/usb/typec/tipd/core.c |    9 +++++++++
 1 file changed, 9 insertions(+)

--- a/drivers/usb/typec/tipd/core.c
+++ b/drivers/usb/typec/tipd/core.c
@@ -629,6 +629,15 @@ static int tps6598x_probe(struct i2c_cli
 	if (!fwnode)
 		return -ENODEV;
 
+	/*
+	 * This fwnode has a "compatible" property, but is never populated as a
+	 * struct device. Instead we simply parse it to read the properties.
+	 * This breaks fw_devlink=on. To maintain backward compatibility
+	 * with existing DT files, we work around this by deleting any
+	 * fwnode_links to/from this fwnode.
+	 */
+	fw_devlink_purge_absent_suppliers(fwnode);
+
 	tps->role_sw = fwnode_usb_role_switch_get(fwnode);
 	if (IS_ERR(tps->role_sw)) {
 		ret = PTR_ERR(tps->role_sw);