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USB: quatech2: fix io after disconnect 

Make sure no control urb is submitted during close after a disconnect by
checking the disconnected flag.

Cc: <stable@vger.kernel.org>
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2012-10-25 10:29:10 +02:00 committed by Greg Kroah-Hartman
parent 8e512ab0b6
commit 2f0295adf6
1 changed files with 7 additions and 0 deletions
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7
drivers/usb/serial/quatech2.c
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@ -427,6 +427,12 @@ 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),
@ -458,6 +464,7 @@ 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)