linux-kernel - [PATCH 5.12 318/363] usb: typec: ucsi: Put fwnode in any case during ->probe()

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Message-Id: <20210517140313.359761361@linuxfoundation.org>
Date:   Mon, 17 May 2021 16:03:04 +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>,
        Andy Shevchenko <andy.shevchenko@...il.com>
Subject: [PATCH 5.12 318/363] usb: typec: ucsi: Put fwnode in any case during ->probe()

From: Andy Shevchenko <andy.shevchenko@...il.com>

commit b9a0866a5bdf6a4643a52872ada6be6184c6f4f2 upstream.

device_for_each_child_node() bumps a reference counting of a returned variable.
We have to balance it whenever we return to the caller.

Fixes: c1b0bc2dabfa ("usb: typec: Add support for UCSI interface")
Cc: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Signed-off-by: Andy Shevchenko <andy.shevchenko@...il.com>
Link: https://lore.kernel.org/r/20210504222337.3151726-1-andy.shevchenko@gmail.com
Cc: stable <stable@...r.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/usb/typec/ucsi/ucsi.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/usb/typec/ucsi/ucsi.c
+++ b/drivers/usb/typec/ucsi/ucsi.c
@@ -1022,6 +1022,7 @@ static const struct typec_operations ucs
 	.pr_set = ucsi_pr_swap
 };
 
+/* Caller must call fwnode_handle_put() after use */
 static struct fwnode_handle *ucsi_find_fwnode(struct ucsi_connector *con)
 {
 	struct fwnode_handle *fwnode;
@@ -1056,7 +1057,7 @@ static int ucsi_register_port(struct ucs
 	command |= UCSI_CONNECTOR_NUMBER(con->num);
 	ret = ucsi_send_command(ucsi, command, &con->cap, sizeof(con->cap));
 	if (ret < 0)
-		goto out;
+		goto out_unlock;
 
 	if (con->cap.op_mode & UCSI_CONCAP_OPMODE_DRP)
 		cap->data = TYPEC_PORT_DRD;
@@ -1174,6 +1175,8 @@ static int ucsi_register_port(struct ucs
 	trace_ucsi_register_port(con->num, &con->status);
 
 out:
+	fwnode_handle_put(cap->fwnode);
+out_unlock:
 	mutex_unlock(&con->lock);
 	return ret;
 }