linux-kernel - [PATCH 5.5 070/189] usb: usb251xb: fix regulator probe and error handling

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Date:   Tue, 10 Mar 2020 13:38:27 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Marco Felsch <m.felsch@...gutronix.de>,
        Richard Leitner <richard.leitner@...data.com>
Subject: [PATCH 5.5 070/189] usb: usb251xb: fix regulator probe and error handling

From: Marco Felsch <m.felsch@...gutronix.de>

commit f06947f275f1838586792c17b6ab70da82ed7b43 upstream.

Commit 4d7201cda226 ("usb: usb251xb: add vdd supply support") didn't
covered the non-DT use-case and so the regualtor_enable() call during
probe will fail on those platforms. Also the commit didn't handled the
error case correctly.

Move devm_regulator_get() out of usb251xb_get_ofdata() to address the
1st issue. This can be done without worries because devm_regulator_get()
handles the non-DT use-case too. Add devm_add_action_or_reset() to
address the 2nd bug.

Fixes: 4d7201cda226 ("usb: usb251xb: add vdd supply support")
Signed-off-by: Marco Felsch <m.felsch@...gutronix.de>
Cc: stable <stable@...r.kernel.org>
Acked-by: Richard Leitner <richard.leitner@...data.com>
Link: https://lore.kernel.org/r/20200226072644.18490-1-m.felsch@pengutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/misc/usb251xb.c |   20 ++++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)

--- a/drivers/usb/misc/usb251xb.c
+++ b/drivers/usb/misc/usb251xb.c
@@ -424,10 +424,6 @@ static int usb251xb_get_ofdata(struct us
 		return err;
 	}
 
-	hub->vdd = devm_regulator_get(dev, "vdd");
-	if (IS_ERR(hub->vdd))
-		return PTR_ERR(hub->vdd);
-
 	if (of_property_read_u16_array(np, "vendor-id", &hub->vendor_id, 1))
 		hub->vendor_id = USB251XB_DEF_VENDOR_ID;
 
@@ -640,6 +636,13 @@ static int usb251xb_get_ofdata(struct us
 }
 #endif /* CONFIG_OF */
 
+static void usb251xb_regulator_disable_action(void *data)
+{
+	struct usb251xb *hub = data;
+
+	regulator_disable(hub->vdd);
+}
+
 static int usb251xb_probe(struct usb251xb *hub)
 {
 	struct device *dev = hub->dev;
@@ -676,10 +679,19 @@ static int usb251xb_probe(struct usb251x
 	if (err)
 		return err;
 
+	hub->vdd = devm_regulator_get(dev, "vdd");
+	if (IS_ERR(hub->vdd))
+		return PTR_ERR(hub->vdd);
+
 	err = regulator_enable(hub->vdd);
 	if (err)
 		return err;
 
+	err = devm_add_action_or_reset(dev,
+				       usb251xb_regulator_disable_action, hub);
+	if (err)
+		return err;
+
 	err = usb251xb_connect(hub);
 	if (err) {
 		dev_err(dev, "Failed to connect hub (%d)\n", err);