linux-kernel - [PATCH] USB: serial: quatech2: fix control-request directions

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Date:   Fri, 21 May 2021 15:32:31 +0200
From:   Johan Hovold <johan@...nel.org>
To:     Johan Hovold <johan@...nel.org>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: [PATCH] USB: serial: quatech2: fix control-request directions

The direction of the pipe argument must match the request-type direction
bit or control requests may fail depending on the host-controller-driver
implementation.

Fix the two QT2_FLUSH_DEVICE requests which erroneously used
usb_rcvctrlpipe().

Fixes: f7a33e608d9a ("USB: serial: add quatech2 usb to serial driver")
Cc: stable@...r.kernel.org      # 3.5
Signed-off-by: Johan Hovold <johan@...nel.org>
---
 drivers/usb/serial/quatech2.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/serial/quatech2.c b/drivers/usb/serial/quatech2.c
index 3b5f2032ecdb..a9ff3904375f 100644
--- a/drivers/usb/serial/quatech2.c
+++ b/drivers/usb/serial/quatech2.c
@@ -416,7 +416,7 @@ static void qt2_close(struct usb_serial_port *port)
 
 	/* flush the port transmit buffer */
 	i = usb_control_msg(serial->dev,
-			    usb_rcvctrlpipe(serial->dev, 0),
+			    usb_sndctrlpipe(serial->dev, 0),
 			    QT2_FLUSH_DEVICE, 0x40, 1,
 			    port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
 
@@ -426,7 +426,7 @@ static void qt2_close(struct usb_serial_port *port)
 
 	/* flush the port receive buffer */
 	i = usb_control_msg(serial->dev,
-			    usb_rcvctrlpipe(serial->dev, 0),
+			    usb_sndctrlpipe(serial->dev, 0),
 			    QT2_FLUSH_DEVICE, 0x40, 0,
 			    port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
 
-- 
2.26.3