diff options
| -rw-r--r-- | drivers/usb/serial/kl5kusb105.c | 26 |
1 files changed, 15 insertions, 11 deletions
diff --git a/drivers/usb/serial/kl5kusb105.c b/drivers/usb/serial/kl5kusb105.c index 90e3216abd1..55736df7d2f 100644 --- a/drivers/usb/serial/kl5kusb105.c +++ b/drivers/usb/serial/kl5kusb105.c @@ -461,17 +461,21 @@ static void klsi_105_close (struct usb_serial_port *port, struct file *filp) dbg("%s port %d", __FUNCTION__, port->number); - /* send READ_OFF */ - rc = usb_control_msg (port->serial->dev, - usb_sndctrlpipe(port->serial->dev, 0), - KL5KUSB105A_SIO_CONFIGURE, - USB_TYPE_VENDOR | USB_DIR_OUT, - KL5KUSB105A_SIO_CONFIGURE_READ_OFF, - 0, /* index */ - NULL, 0, - KLSI_TIMEOUT); - if (rc < 0) - err("Disabling read failed (error = %d)", rc); + mutex_lock(&port->serial->disc_mutex); + if (!port->serial->disconnected) { + /* send READ_OFF */ + rc = usb_control_msg (port->serial->dev, + usb_sndctrlpipe(port->serial->dev, 0), + KL5KUSB105A_SIO_CONFIGURE, + USB_TYPE_VENDOR | USB_DIR_OUT, + KL5KUSB105A_SIO_CONFIGURE_READ_OFF, + 0, /* index */ + NULL, 0, + KLSI_TIMEOUT); + if (rc < 0) + err("Disabling read failed (error = %d)", rc); + } + mutex_unlock(&port->serial->disc_mutex); /* shutdown our bulk reads and writes */ usb_kill_urb(port->write_urb); |