diff options
Diffstat (limited to 'drivers/usb/serial/ftdi_sio.c')
| -rw-r--r-- | drivers/usb/serial/ftdi_sio.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c index 2c142bb04fe1..90dcc625f70d 100644 --- a/drivers/usb/serial/ftdi_sio.c +++ b/drivers/usb/serial/ftdi_sio.c @@ -1198,7 +1198,8 @@ static void ftdi_close (struct usb_serial_port *port, struct file *filp) dbg("%s", __FUNCTION__); - if (c_cflag & HUPCL){ + mutex_lock(&port->serial->disc_mutex); + if (c_cflag & HUPCL && !port->serial->disconnected){ /* Disable flow control */ if (usb_control_msg(port->serial->dev, usb_sndctrlpipe(port->serial->dev, 0), @@ -1212,6 +1213,7 @@ static void ftdi_close (struct usb_serial_port *port, struct file *filp) /* drop RTS and DTR */ clear_mctrl(port, TIOCM_DTR | TIOCM_RTS); } /* Note change no line if hupcl is off */ + mutex_unlock(&port->serial->disc_mutex); /* cancel any scheduled reading */ cancel_delayed_work(&priv->rx_work); |