virtio: console: Add ability to remove module

Add the ability to remove the virtio_console module.

This aids debugging.

Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
index 69d2e61..0057bae 100644 (file)
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -1448,6 +1448,36 @@ fail:
        return err;
 }
 
+static void virtcons_remove(struct virtio_device *vdev)
+{
+       struct ports_device *portdev;
+       struct port *port, *port2;
+       struct port_buffer *buf;
+       unsigned int len;
+
+       portdev = vdev->priv;
+
+       cancel_work_sync(&portdev->control_work);
+       cancel_work_sync(&portdev->config_work);
+
+       list_for_each_entry_safe(port, port2, &portdev->ports, list)
+               remove_port(port);
+
+       unregister_chrdev(portdev->chr_major, "virtio-portsdev");
+
+       while ((buf = portdev->c_ivq->vq_ops->get_buf(portdev->c_ivq, &len)))
+               free_buf(buf);
+
+       while ((buf = portdev->c_ivq->vq_ops->detach_unused_buf(portdev->c_ivq)))
+               free_buf(buf);
+
+       vdev->config->del_vqs(vdev);
+       kfree(portdev->in_vqs);
+       kfree(portdev->out_vqs);
+
+       kfree(portdev);
+}
+
 static struct virtio_device_id id_table[] = {
        { VIRTIO_ID_CONSOLE, VIRTIO_DEV_ANY_ID },
        { 0 },
@@ -1465,6 +1495,7 @@ static struct virtio_driver virtio_console = {
        .driver.owner = THIS_MODULE,
        .id_table =     id_table,
        .probe =        virtcons_probe,
+       .remove =       virtcons_remove,
        .config_changed = config_intr,
 };
 
@@ -1488,7 +1519,17 @@ static int __init init(void)
 
        return register_virtio_driver(&virtio_console);
 }
+
+static void __exit fini(void)
+{
+       unregister_virtio_driver(&virtio_console);
+
+       class_destroy(pdrvdata.class);
+       if (pdrvdata.debugfs_dir)
+               debugfs_remove_recursive(pdrvdata.debugfs_dir);
+}
 module_init(init);
+module_exit(fini);
 
 MODULE_DEVICE_TABLE(virtio, id_table);
 MODULE_DESCRIPTION("Virtio console driver");