SUNRPC: Add a helper rpc_call_start() that initialises task->tk_action

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

include/linux/sunrpc/clnt.h

@@ -127,7 +127,7 @@ int		rpcb_getport_sync(struct sockaddr_in *, __u32, __u32, int);
 void		rpcb_getport_async(struct rpc_task *);
 
 void		rpc_call_setup(struct rpc_task *, const struct rpc_message *, int);
-
+void		rpc_call_start(struct rpc_task *);
 int		rpc_call_async(struct rpc_clnt *clnt, struct rpc_message *msg,
 			       int flags, const struct rpc_call_ops *tk_ops,
 			       void *calldata);

net/sunrpc/clnt.c

@@ -634,6 +634,13 @@ rpc_call_setup(struct rpc_task *task, const struct rpc_message *msg, int flags)
 }
 EXPORT_SYMBOL_GPL(rpc_call_setup);
 
+void
+rpc_call_start(struct rpc_task *task)
+{
+	task->tk_action = call_start;
+}
+EXPORT_SYMBOL_GPL(rpc_call_start);
+
 /**
  * rpc_peeraddr - extract remote peer address from clnt's xprt
  * @clnt: RPC client structure