net: simplify net_client_init1()

Drop the union and move the hubport creation into the !is_netdev case.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-id: 1432743412-15943-6-git-send-email-stefanha@redhat.com

net/net.c

@@ -913,18 +913,14 @@ static int (* const net_client_init_fun[NET_CLIENT_OPTIONS_KIND_MAX])(
 
 static int net_client_init1(const void *object, int is_netdev, Error **errp)
 {
-    union {
-        const Netdev    *netdev;
-        const NetLegacy *net;
-    } u;
     const NetClientOptions *opts;
     const char *name;
     NetClientState *peer = NULL;
 
     if (is_netdev) {
-        u.netdev = object;
-        opts = u.netdev->opts;
-        name = u.netdev->id;
+        const Netdev *netdev = object;
+        opts = netdev->opts;
+        name = netdev->id;
 
         if (opts->kind == NET_CLIENT_OPTIONS_KIND_DUMP ||
             opts->kind == NET_CLIENT_OPTIONS_KIND_NIC ||
@@ -934,34 +930,32 @@ static int net_client_init1(const void *object, int is_netdev, Error **errp)
             return -1;
         }
     } else {
-        u.net = object;
-        opts = u.net->opts;
-        if (opts->kind == NET_CLIENT_OPTIONS_KIND_HUBPORT) {
-            error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
-                       "a net type");
-            return -1;
-        }
+        const NetLegacy *net = object;
+        opts = net->opts;
         /* missing optional values have been initialized to "all bits zero" */
-        name = u.net->has_id ? u.net->id : u.net->name;
+        name = net->has_id ? net->id : net->name;
 
         if (opts->kind == NET_CLIENT_OPTIONS_KIND_NONE) {
             return 0; /* nothing to do */
         }
+        if (opts->kind == NET_CLIENT_OPTIONS_KIND_HUBPORT) {
+            error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
+                       "a net type");
+            return -1;
+        }
 
         if (!net_client_init_fun[opts->kind]) {
             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
                        "a net backend type (maybe it is not compiled "
                        "into this binary)");
             return -1;
         }
-    }
 
-    /* Do not add to a vlan if it's a -netdev or a nic with a netdev=
-     * parameter. */
-    if (!is_netdev &&
-        (opts->kind != NET_CLIENT_OPTIONS_KIND_NIC ||
-         !opts->nic->has_netdev)) {
-        peer = net_hub_add_port(u.net->has_vlan ? u.net->vlan : 0, NULL);
+        /* Do not add to a vlan if it's a nic with a netdev= parameter. */
+        if (opts->kind != NET_CLIENT_OPTIONS_KIND_NIC ||
+            !opts->nic->has_netdev) {
+            peer = net_hub_add_port(net->has_vlan ? net->vlan : 0, NULL);
+        }
     }
 
     if (net_client_init_fun[opts->kind](opts, name, peer, errp) < 0) {