[PATCH 3.2 099/199] USB: serial: ch341: fix open error handling

[Ben Hutchings]

3.2.87-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Johan Hovold <johan@xxxxxxxxxx>

commit f2950b78547ffb8475297ada6b92bc2d774d5461 upstream.

Make sure to stop the interrupt URB before returning on errors during
open.

Fixes: 664d5df92e88 ("USB: usb-serial ch341: support for DTR/RTS/CTS")
Signed-off-by: Johan Hovold <johan@xxxxxxxxxx>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
 drivers/usb/serial/ch341.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

--- a/drivers/usb/serial/ch341.c
+++ b/drivers/usb/serial/ch341.c
@@ -327,7 +327,7 @@ static int ch341_open(struct tty_struct
 
 	r = ch341_configure(serial->dev, priv);
 	if (r)
-		goto out;
+		return r;
 
 	if (tty)
 		ch341_set_termios(tty, port, NULL);
@@ -338,12 +338,19 @@ static int ch341_open(struct tty_struct
 	if (r) {
 		dev_err(&port->dev, "%s - failed submitting interrupt urb,"
 			" error %d\n", __func__, r);
-		goto out;
+		return r;
 	}
 
 	r = usb_serial_generic_open(tty, port);
+	if (r)
+		goto err_kill_interrupt_urb;
+
+	return 0;
+
+err_kill_interrupt_urb:
+	usb_kill_urb(port->interrupt_in_urb);
 
-out:	return r;
+	return r;
 }
 
 /* Old_termios contains the original termios settings and