[PATCH] Fix crash when unloading yenta_socket in Linux 2.5.69

socket->base is unmapped in yenta_close(), which is called by
cardbus_remove().  The value of socket->base is not changed to
NULL, so it becomes invalid.

Then cardbus_remove() calls class_device_unregister(), which calls
pcmcia_unregister_socket(), which it turn tries to access memory
space of the socket.

drivers/pcmcia/pci_socket.c

@@ -196,9 +196,9 @@ static void __devexit cardbus_remove (struct pci_dev *dev)
 	pci_socket_t *socket = pci_get_drvdata(dev);
 
 	/* note: we are already unregistered from the cs core */
+	class_device_unregister(&socket->cls_d.class_dev);
 	if (socket->op && socket->op->close)
 		socket->op->close(socket);
-	class_device_unregister(&socket->cls_d.class_dev);
 	pci_set_drvdata(dev, NULL);
 }