USB: more serial drivers writing after disconnect

[karo-tx-linux.git] / drivers / usb / serial / visor.c

diff --git a/drivers/usb/serial/visor.c b/drivers/usb/serial/visor.c
index 7ee087fed913fbeed34678caebbe15dc8a96567c..22b3f78a388ce0d40486ede8c98f9af41051dc49 100644 (file)
--- 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",