linux-kernel - [PATCH] usb: typec: nb7vpq904m: Add an error handling path in nb7vpq904m

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Date:   Tue, 18 Jul 2023 23:40:05 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Neil Armstrong <neil.armstrong@...aro.org>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        linux-usb@...r.kernel.org
Subject: [PATCH] usb: typec: nb7vpq904m: Add an error handling path in nb7vpq904m_probe()

In case of error in the nb7vpq904m_probe() probe function, some resources
need to be freed, as already done in the remove function.

Add the missing error handling path and adjust code accordingly.

Fixes: 88d8f3ac9c67 ("usb: typec: add support for the nb7vpq904m Type-C Linear Redriver")
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
This changes the order with some devm_ allocated resources. I hope this is
fine. At least it is consistent with the remove function.
---
 drivers/usb/typec/mux/nb7vpq904m.c | 25 ++++++++++++++++++-------
 1 file changed, 18 insertions(+), 7 deletions(-)

diff --git a/drivers/usb/typec/mux/nb7vpq904m.c b/drivers/usb/typec/mux/nb7vpq904m.c
index 80e580d50129..4d1122d95013 100644
--- a/drivers/usb/typec/mux/nb7vpq904m.c
+++ b/drivers/usb/typec/mux/nb7vpq904m.c
@@ -463,16 +463,18 @@ static int nb7vpq904m_probe(struct i2c_client *client)
 
 	ret = nb7vpq904m_register_bridge(nb7);
 	if (ret)
-		return ret;
+		goto err_disable_gpio;
 
 	sw_desc.drvdata = nb7;
 	sw_desc.fwnode = dev->fwnode;
 	sw_desc.set = nb7vpq904m_sw_set;
 
 	nb7->sw = typec_switch_register(dev, &sw_desc);
-	if (IS_ERR(nb7->sw))
-		return dev_err_probe(dev, PTR_ERR(nb7->sw),
-				     "Error registering typec switch\n");
+	if (IS_ERR(nb7->sw)) {
+		ret = dev_err_probe(dev, PTR_ERR(nb7->sw),
+				    "Error registering typec switch\n");
+		goto err_disable_gpio;
+	}
 
 	retimer_desc.drvdata = nb7;
 	retimer_desc.fwnode = dev->fwnode;
@@ -480,12 +482,21 @@ static int nb7vpq904m_probe(struct i2c_client *client)
 
 	nb7->retimer = typec_retimer_register(dev, &retimer_desc);
 	if (IS_ERR(nb7->retimer)) {
-		typec_switch_unregister(nb7->sw);
-		return dev_err_probe(dev, PTR_ERR(nb7->retimer),
-				     "Error registering typec retimer\n");
+		ret = dev_err_probe(dev, PTR_ERR(nb7->retimer),
+				    "Error registering typec retimer\n");
+		goto err_switch_unregister;
 	}
 
 	return 0;
+
+err_switch_unregister:
+	typec_switch_unregister(nb7->sw);
+
+err_disable_gpio:
+	gpiod_set_value(nb7->enable_gpio, 0);
+	regulator_disable(nb7->vcc_supply);
+
+	return ret;
 }
 
 static void nb7vpq904m_remove(struct i2c_client *client)
-- 
2.34.1