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xen/pvcalls: disconnect and module_exit 

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.

[ boris: fixed long lines ]

Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
CC: boris.ostrovsky@oracle.com
CC: jgross@suse.com
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
zero-colors
Stefano Stabellini 2017-07-06 11:01:07 -07:00 committed by Boris Ostrovsky
parent a51729cb9b
commit 0a85d23b81
1 changed files with 53 additions and 0 deletions
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53
drivers/xen/pvcalls-back.c
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@ -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);