linux-kernel - [PATCH v1] usb: typec: Return size of buffer if pd

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Message-ID: <20240319074309.3306579-1-kyletso@google.com>
Date: Tue, 19 Mar 2024 15:43:09 +0800
From: Kyle Tso <kyletso@...gle.com>
To: linux@...ck-us.net, heikki.krogerus@...ux.intel.com, 
	gregkh@...uxfoundation.org
Cc: badhri@...gle.com, linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org, 
	Kyle Tso <kyletso@...gle.com>, stable@...r.kernel.org
Subject: [PATCH v1] usb: typec: Return size of buffer if pd_set operation succeeds

The attribute writing should return the number of bytes used from the
buffer on success.

Fixes: a7cff92f0635 ("usb: typec: USB Power Delivery helpers for ports and partners")
Cc: stable@...r.kernel.org
Signed-off-by: Kyle Tso <kyletso@...gle.com>
---
 drivers/usb/typec/class.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
index 389c7f0b8d93..9610e647a8d4 100644
--- a/drivers/usb/typec/class.c
+++ b/drivers/usb/typec/class.c
@@ -1310,6 +1310,7 @@ static ssize_t select_usb_power_delivery_store(struct device *dev,
 {
 	struct typec_port *port = to_typec_port(dev);
 	struct usb_power_delivery *pd;
+	int ret;
 
 	if (!port->ops || !port->ops->pd_set)
 		return -EOPNOTSUPP;
@@ -1318,7 +1319,11 @@ static ssize_t select_usb_power_delivery_store(struct device *dev,
 	if (!pd)
 		return -EINVAL;
 
-	return port->ops->pd_set(port, pd);
+	ret = port->ops->pd_set(port, pd);
+	if (ret)
+		return ret;
+
+	return size;
 }
 
 static ssize_t select_usb_power_delivery_show(struct device *dev,
-- 
2.44.0.291.gc1ea87d7ee-goog