SUNRPC: Initialise struct svc_serv backchannel fields during __svc_create()

Clean up.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

fs/nfs/callback.c

@@ -147,9 +147,6 @@ nfs41_callback_up(struct svc_serv *serv)
 {
 	struct svc_rqst *rqstp;
 
-	INIT_LIST_HEAD(&serv->sv_cb_list);
-	spin_lock_init(&serv->sv_cb_lock);
-	init_waitqueue_head(&serv->sv_cb_waitq);
 	rqstp = svc_prepare_thread(serv, &serv->sv_pools[0], NUMA_NO_NODE);
 	dprintk("--> %s return %d\n", __func__, PTR_ERR_OR_ZERO(rqstp));
 	return rqstp;

net/sunrpc/svc.c

@@ -401,6 +401,21 @@ int svc_bind(struct svc_serv *serv, struct net *net)
 }
 EXPORT_SYMBOL_GPL(svc_bind);
 
+#if defined(CONFIG_SUNRPC_BACKCHANNEL)
+static void
+__svc_init_bc(struct svc_serv *serv)
+{
+	INIT_LIST_HEAD(&serv->sv_cb_list);
+	spin_lock_init(&serv->sv_cb_lock);
+	init_waitqueue_head(&serv->sv_cb_waitq);
+}
+#else
+static void
+__svc_init_bc(struct svc_serv *serv)
+{
+}
+#endif
+
 /*
  * Create an RPC service
  */
@@ -443,6 +458,8 @@ __svc_create(struct svc_program *prog, unsigned int bufsize, int npools,
 	init_timer(&serv->sv_temptimer);
 	spin_lock_init(&serv->sv_lock);
 
+	__svc_init_bc(serv);
+
 	serv->sv_nrpools = npools;
 	serv->sv_pools =
 		kcalloc(serv->sv_nrpools, sizeof(struct svc_pool),