diff options
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/serial/quatech2.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/usb/serial/quatech2.c b/drivers/usb/serial/quatech2.c index e2c5b69c7eef..ea69301d89a2 100644 --- a/drivers/usb/serial/quatech2.c +++ b/drivers/usb/serial/quatech2.c @@ -429,6 +429,12 @@ static void qt2_close(struct usb_serial_port *port) port_priv->urb_in_use = false; spin_unlock_irqrestore(&port_priv->urb_lock, flags); + mutex_lock(&port->serial->disc_mutex); + if (port->serial->disconnected) { + mutex_unlock(&port->serial->disc_mutex); + return; + } + /* flush the port transmit buffer */ i = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), @@ -460,6 +466,7 @@ static void qt2_close(struct usb_serial_port *port) dev_err(&port->dev, "%s - close port failed %i\n", __func__, i); + mutex_unlock(&port->serial->disc_mutex); } static void qt2_disconnect(struct usb_serial *serial) |