diff options
Diffstat (limited to 'drivers/usb/serial/visor.c')
| -rw-r--r-- | drivers/usb/serial/visor.c | 22 |
1 files changed, 13 insertions, 9 deletions
diff --git a/drivers/usb/serial/visor.c b/drivers/usb/serial/visor.c index 7ee087fed913..22b3f78a388c 100644 --- a/drivers/usb/serial/visor.c +++ b/drivers/usb/serial/visor.c @@ -349,16 +349,20 @@ static void visor_close (struct usb_serial_port *port, struct file * filp) usb_kill_urb(port->read_urb); usb_kill_urb(port->interrupt_in_urb); - /* Try to send shutdown message, if the device is gone, this will just fail. */ - transfer_buffer = kmalloc (0x12, GFP_KERNEL); - if (transfer_buffer) { - usb_control_msg (port->serial->dev, - usb_rcvctrlpipe(port->serial->dev, 0), - VISOR_CLOSE_NOTIFICATION, 0xc2, - 0x0000, 0x0000, - transfer_buffer, 0x12, 300); - kfree (transfer_buffer); + mutex_lock(&port->serial->disc_mutex); + if (!port->serial->disconnected) { + /* Try to send shutdown message, unless the device is gone */ + transfer_buffer = kmalloc (0x12, GFP_KERNEL); + if (transfer_buffer) { + usb_control_msg (port->serial->dev, + usb_rcvctrlpipe(port->serial->dev, 0), + VISOR_CLOSE_NOTIFICATION, 0xc2, + 0x0000, 0x0000, + transfer_buffer, 0x12, 300); + kfree (transfer_buffer); + } } + mutex_unlock(&port->serial->disc_mutex); if (stats) dev_info(&port->dev, "Bytes In = %d Bytes Out = %d\n", |