patch-2.4.12 linux/drivers/usb/serial/cyberjack.c

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diff -u --recursive --new-file v2.4.11/linux/drivers/usb/serial/cyberjack.c linux/drivers/usb/serial/cyberjack.c
@@ -198,10 +198,12 @@
 	--port->open_count;
 
 	if (port->open_count <= 0) {
-		/* shutdown any bulk reads that might be going on */
-		usb_unlink_urb (port->write_urb);
-		usb_unlink_urb (port->read_urb);
-		usb_unlink_urb (port->interrupt_in_urb);
+		if (port->serial->dev) {
+			/* shutdown any bulk reads that might be going on */
+			usb_unlink_urb (port->write_urb);
+			usb_unlink_urb (port->read_urb);
+			usb_unlink_urb (port->interrupt_in_urb);
+		}
 
 		port->active = 0;
 		port->open_count = 0;

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