vswitchd: Make iface_create() return an indication of success.

This is the minimal change that gets the job done.  There are much nicer
ways to do this, but I'll leave that refactoring for later in the series.

The return value will have its first user in an upcoming commit.

Signed-off-by: Ben Pfaff <blp@nicira.com>

diff --git a/vswitchd/bridge.c b/vswitchd/bridge.c
index e83eeae..e7dca59 100644 (file)
--- a/vswitchd/bridge.c
+++ b/vswitchd/bridge.c
@@ -229,7 +229,7 @@ static bool mirror_configure(struct mirror *);
 static void mirror_refresh_stats(struct mirror *);
 
 static void iface_configure_lacp(struct iface *, struct lacp_slave_settings *);
-static void iface_create(struct bridge *, struct if_cfg *, int ofp_port);
+static bool iface_create(struct bridge *, struct if_cfg *, int ofp_port);
 static const char *iface_get_type(const struct ovsrec_interface *,
                                   const struct ovsrec_bridge *);
 static void iface_destroy(struct iface *);
@@ -1244,13 +1244,16 @@ bridge_refresh_ofp_port(struct bridge *br)
 /* Creates a new iface on 'br' based on 'if_cfg'.  The new iface has OpenFlow
  * port number 'ofp_port'.  If ofp_port is negative, an OpenFlow port is
  * automatically allocated for the iface.  Takes ownership of and
- * deallocates 'if_cfg'. */
-static void
+ * deallocates 'if_cfg'.
+ *
+ * Return true if an iface is successfully created, false otherwise. */
+static bool
 iface_create(struct bridge *br, struct if_cfg *if_cfg, int ofp_port)
 {
     struct iface *iface;
     struct port *port;
     int error;
+    bool ok;
 
     assert(!iface_lookup(br, if_cfg->cfg->name));
 
@@ -1321,7 +1324,8 @@ iface_create(struct bridge *br, struct if_cfg *if_cfg, int ofp_port)
     }
 
     /* Delete the iface if we failed. */
-    if (iface->netdev && iface->ofp_port >= 0) {
+    ok = iface->netdev && iface->ofp_port >= 0;
+    if (ok) {
         VLOG_DBG("bridge %s: interface %s is on port %d",
                  br->name, iface->name, iface->ofp_port);
     } else {
@@ -1345,9 +1349,11 @@ iface_create(struct bridge *br, struct if_cfg *if_cfg, int ofp_port)
         iface_destroy(iface);
     }
 
-    if (list_is_empty(&port->ifaces)) {
-        port_destroy(port);
-        return;
+    if (!ok) {
+        if (list_is_empty(&port->ifaces)) {
+            port_destroy(port);
+        }
+        return false;
     }
 
     /* Add bond fake iface if necessary. */
@@ -1372,6 +1378,8 @@ iface_create(struct bridge *br, struct if_cfg *if_cfg, int ofp_port)
             ofproto_port_destroy(&ofproto_port);
         }
     }
+
+    return true;
 }
 
 static const char *