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Subject[PATCH v5 14/18] xen/pvcalls: disconnect and module_exit
Date
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@aporeto.com>
CC: boris.ostrovsky@oracle.com
CC: jgross@suse.com
---
drivers/xen/pvcalls-back.c | 53 ++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 53 insertions(+)

diff --git a/drivers/xen/pvcalls-back.c b/drivers/xen/pvcalls-back.c
index f6f88ce..7a8e866 100644
--- a/drivers/xen/pvcalls-back.c
+++ b/drivers/xen/pvcalls-back.c
@@ -812,6 +812,43 @@ static int backend_connect(struct xenbus_device *dev)

static int backend_disconnect(struct xenbus_device *dev)
{
+ struct pvcalls_fedata *fedata;
+ struct sock_mapping *map, *n;
+ struct sockpass_mapping *mappass;
+ struct radix_tree_iter iter;
+ void **slot;
+
+
+ fedata = dev_get_drvdata(&dev->dev);
+
+ down(&fedata->socket_lock);
+ list_for_each_entry_safe(map, n, &fedata->socket_mappings, list) {
+ list_del(&map->list);
+ pvcalls_back_release_active(dev, fedata, map);
+ }
+
+ radix_tree_for_each_slot(slot, &fedata->socketpass_mappings, &iter, 0) {
+ mappass = radix_tree_deref_slot(slot);
+ if (!mappass)
+ continue;
+ if (radix_tree_exception(mappass)) {
+ if (radix_tree_deref_retry(mappass))
+ slot = radix_tree_iter_retry(&iter);
+ } else {
+ radix_tree_delete(&fedata->socketpass_mappings, mappass->id);
+ pvcalls_back_release_passive(dev, fedata, mappass);
+ }
+ }
+ up(&fedata->socket_lock);
+
+ xenbus_unmap_ring_vfree(dev, fedata->sring);
+ unbind_from_irqhandler(fedata->irq, dev);
+
+ list_del(&fedata->list);
+ destroy_workqueue(fedata->wq);
+ kfree(fedata);
+ dev_set_drvdata(&dev->dev, NULL);
+
return 0;
}

@@ -1005,3 +1042,19 @@ static int __init pvcalls_back_init(void)
return 0;
}
module_init(pvcalls_back_init);
+
+static void __exit pvcalls_back_fin(void)
+{
+ struct pvcalls_fedata *fedata, *nfedata;
+
+ down(&pvcalls_back_global.frontends_lock);
+ list_for_each_entry_safe(fedata, nfedata, &pvcalls_back_global.frontends,
+ list) {
+ backend_disconnect(fedata->dev);
+ }
+ up(&pvcalls_back_global.frontends_lock);
+
+ xenbus_unregister_driver(&pvcalls_back_driver);
+}
+
+module_exit(pvcalls_back_fin);
--
1.9.1
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