File _service:obs_scm:virtio-net-bugfix-do-not-delet... of Package qemu

File _service:obs_scm:virtio-net-bugfix-do-not-delete-netdev-before-virtio.patch of Package qemu

From 3cd74fd83d58aa88f9a006980c73844d6b79d1fb Mon Sep 17 00:00:00 2001
From: Jinhua Cao <caojinhua1@huawei.com>
Date: Thu, 10 Feb 2022 10:31:38 +0800
Subject: [PATCH] virtio-net: bugfix: do not delete netdev before virtio net

For the vhost-user net-card, it is allow to delete its
network backend while the virtio-net device still exists.
However, when the status of the device changes in guest,
QEMU will check whether the network backend exists, otherwise
it will crash.
So do not allowed to delete the network backend directly
without delete virtio-net device.

Signed-off-by: Jinhua Cao <caojinhua1@huawei.com>
---
 net/net.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/net/net.c b/net/net.c
index 0520bc1681..bcd3d7e04c 100644
--- a/net/net.c
+++ b/net/net.c
@@ -1322,6 +1322,12 @@ void qmp_netdev_del(const char *id, Error **errp)
         return;
     }
 
+    if (nc->info->type == NET_CLIENT_DRIVER_VHOST_USER && nc->peer) {
+        error_setg(errp, "Device '%s' is a netdev for vhostuser,"
+                   "please delete the peer front-end device (virtio-net) first.", id);
+        return;
+    }
+
     qemu_del_net_client(nc);
 
     /*
-- 
2.27.0