linux-kernel - [PATCH v1 12/13] xen/pvcalls: implement frontend disconnect

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Date:   Fri, 21 Jul 2017 17:12:02 -0700
From:   Stefano Stabellini <sstabellini@...nel.org>
To:     xen-devel@...ts.xen.org
Cc:     linux-kernel@...r.kernel.org, sstabellini@...nel.org,
        jgross@...e.com, boris.ostrovsky@...cle.com,
        Stefano Stabellini <stefano@...reto.com>
Subject: [PATCH v1 12/13] xen/pvcalls: implement frontend disconnect

Implement pvcalls frontend removal function. Go through the list of
active and passive sockets and free them all, one at a time.

Signed-off-by: Stefano Stabellini <stefano@...reto.com>
CC: boris.ostrovsky@...cle.com
CC: jgross@...e.com
---
 drivers/xen/pvcalls-front.c | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/drivers/xen/pvcalls-front.c b/drivers/xen/pvcalls-front.c
index bd3dfac..fcc15fb 100644
--- a/drivers/xen/pvcalls-front.c
+++ b/drivers/xen/pvcalls-front.c
@@ -898,6 +898,34 @@ int pvcalls_front_release(struct socket *sock)
 
 static int pvcalls_front_remove(struct xenbus_device *dev)
 {
+	struct pvcalls_bedata *bedata;
+	struct sock_mapping *map = NULL, *n;
+
+	bedata = dev_get_drvdata(&pvcalls_front_dev->dev);
+
+	list_for_each_entry_safe(map, n, &bedata->socket_mappings, list) {
+		mutex_lock(&map->active.in_mutex);
+		mutex_lock(&map->active.out_mutex);
+		pvcalls_front_free_map(bedata, map);
+		mutex_unlock(&map->active.out_mutex);
+		mutex_unlock(&map->active.in_mutex);
+		kfree(map);
+	}
+	list_for_each_entry_safe(map, n, &bedata->socketpass_mappings, list) {
+		spin_lock(&bedata->pvcallss_lock);
+		list_del_init(&map->list);
+		spin_unlock(&bedata->pvcallss_lock);
+		kfree(map);
+	}
+	if (bedata->irq > 0)
+		unbind_from_irqhandler(bedata->irq, dev);
+	if (bedata->ref >= 0)
+		gnttab_end_foreign_access(bedata->ref, 0, 0);
+	kfree(bedata->ring.sring);
+	kfree(bedata);
+	dev_set_drvdata(&dev->dev, NULL);
+	xenbus_switch_state(dev, XenbusStateClosed);
+	pvcalls_front_dev = NULL;
 	return 0;
 }
 
-- 
1.9.1