xen/pvcalls: disconnect and module_exit (0a85d23b) · Commits · 戴 / test

drivers/xen/pvcalls-back.c

+53 −0

Original line number	Diff line number	Diff line
		@@ -807,6 +807,43 @@ 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);

		unbind_from_irqhandler(fedata->irq, dev);
		xenbus_unmap_ring_vfree(dev, fedata->sring);

		list_del(&fedata->list);
		kfree(fedata);
		dev_set_drvdata(&dev->dev, NULL);

		return 0;
		}

		@@ -1003,3 +1040,19 @@ 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);

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