[Xen-devel] [PATCH v3 14/18] xen/pvcalls: disconnect and module_exit

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

Implement backend_disconnect. Call pvcalls_back_release_active on active
sockets and pvcalls_back_release_passive on passive sockets.

Implement module_exit by calling backend_disconnect on frontend
connections.

Signed-off-by: Stefano Stabellini <stefano@xxxxxxxxxxx>
CC: boris.ostrovsky@xxxxxxxxxx
CC: jgross@xxxxxxxx
---
 drivers/xen/pvcalls-back.c | 49 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)

diff --git a/drivers/xen/pvcalls-back.c b/drivers/xen/pvcalls-back.c
index b541887..6afe7a0 100644
--- a/drivers/xen/pvcalls-back.c
+++ b/drivers/xen/pvcalls-back.c
@@ -800,6 +800,38 @@ static int backend_connect(struct xenbus_device *dev)
 
 static int backend_disconnect(struct xenbus_device *dev)
 {
+       struct pvcalls_fedata *priv;
+       struct sock_mapping *map, *n;
+       struct sockpass_mapping *mappass;
+       struct radix_tree_iter iter;
+       void **slot;
+
+
+       priv = dev_get_drvdata(&dev->dev);
+
+       list_for_each_entry_safe(map, n, &priv->socket_mappings, list) {
+               pvcalls_back_release_active(dev, priv, map);
+       }
+
+       radix_tree_for_each_slot(slot, &priv->socketpass_mappings, &iter, 0) {
+               mappass = radix_tree_deref_slot(slot);
+               if (!mappass || radix_tree_exception(mappass)) {
+                       if (radix_tree_deref_retry(mappass)) {
+                               slot = radix_tree_iter_retry(&iter);
+                               continue;
+                       }
+               } else
+                       pvcalls_back_release_passive(dev, priv, mappass);
+       }
+
+       xenbus_unmap_ring_vfree(dev, (void *)priv->sring);
+       unbind_from_irqhandler(priv->irq, dev);
+
+       list_del(&priv->list);
+       destroy_workqueue(priv->wq);
+       kfree(priv);
+       dev_set_drvdata(&dev->dev, NULL);
+
        return 0;
 }
 
@@ -993,3 +1025,20 @@ static int __init pvcalls_back_init(void)
        return 0;
 }
 module_init(pvcalls_back_init);
+
+static void __exit pvcalls_back_fin(void)
+{
+       struct pvcalls_fedata *priv, *npriv;
+
+       down(&pvcalls_back_global.frontends_lock);
+       list_for_each_entry_safe(priv, npriv, &pvcalls_back_global.frontends,
+                                list) {
+               backend_disconnect(priv->dev);
+       }
+       up(&pvcalls_back_global.frontends_lock);
+
+       xenbus_unregister_driver(&pvcalls_back_driver);
+       memset(&pvcalls_back_global, 0, sizeof(pvcalls_back_global));
+}
+
+module_exit(pvcalls_back_fin);
-- 
1.9.1


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