net/xprtrdma: Simplify ib_post_(send|recv|srq_recv)() calls

Instead of declaring and passing a dummy 'bad_wr' pointer, pass NULL
as third argument to ib_post_(send|recv|srq_recv)().
Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Reviewed-by: Chuck Lever <chuck.lever@oracle.com>
Acked-by: Anna Schumaker <Anna.Schumaker@netapp.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

net/sunrpc/xprtrdma/fmr_ops.c

@@ -279,9 +279,7 @@ fmr_op_map(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg,
 static int
 fmr_op_send(struct rpcrdma_ia *ia, struct rpcrdma_req *req)
 {
-	struct ib_send_wr *bad_wr;
-
-	return ib_post_send(ia->ri_id->qp, &req->rl_sendctx->sc_wr, &bad_wr);
+	return ib_post_send(ia->ri_id->qp, &req->rl_sendctx->sc_wr, NULL);
 }
 
 /* Invalidate all memory regions that were registered for "req".

net/sunrpc/xprtrdma/frwr_ops.c

@@ -464,7 +464,7 @@ frwr_op_map(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg,
 static int
 frwr_op_send(struct rpcrdma_ia *ia, struct rpcrdma_req *req)
 {
-	struct ib_send_wr *post_wr, *bad_wr;
+	struct ib_send_wr *post_wr;
 	struct rpcrdma_mr *mr;
 
 	post_wr = &req->rl_sendctx->sc_wr;
@@ -486,7 +486,7 @@ frwr_op_send(struct rpcrdma_ia *ia, struct rpcrdma_req *req)
 	/* If ib_post_send fails, the next ->send_request for
 	 * @req will queue these MWs for recovery.
 	 */
-	return ib_post_send(ia->ri_id->qp, post_wr, &bad_wr);
+	return ib_post_send(ia->ri_id->qp, post_wr, NULL);
 }
 
 /* Handle a remotely invalidated mr on the @mrs list

net/sunrpc/xprtrdma/svc_rdma_recvfrom.c

@@ -229,11 +229,10 @@ void svc_rdma_recv_ctxt_put(struct svcxprt_rdma *rdma,
 static int __svc_rdma_post_recv(struct svcxprt_rdma *rdma,
 				struct svc_rdma_recv_ctxt *ctxt)
 {
-	struct ib_recv_wr *bad_recv_wr;
 	int ret;
 
 	svc_xprt_get(&rdma->sc_xprt);
-	ret = ib_post_recv(rdma->sc_qp, &ctxt->rc_recv_wr, &bad_recv_wr);
+	ret = ib_post_recv(rdma->sc_qp, &ctxt->rc_recv_wr, NULL);
 	trace_svcrdma_post_recv(&ctxt->rc_recv_wr, ret);
 	if (ret)
 		goto err_post;

net/sunrpc/xprtrdma/svc_rdma_rw.c

@@ -329,7 +329,7 @@ static int svc_rdma_post_chunk_ctxt(struct svc_rdma_chunk_ctxt *cc)
 	do {
 		if (atomic_sub_return(cc->cc_sqecount,
 				      &rdma->sc_sq_avail) > 0) {
-			ret = ib_post_send(rdma->sc_qp, first_wr, &bad_wr);
+			ret = ib_post_send(rdma->sc_qp, first_wr, NULL);
 			trace_svcrdma_post_rw(&cc->cc_cqe,
 					      cc->cc_sqecount, ret);
 			if (ret)

net/sunrpc/xprtrdma/svc_rdma_sendto.c

@@ -291,7 +291,6 @@ static void svc_rdma_wc_send(struct ib_cq *cq, struct ib_wc *wc)
  */
 int svc_rdma_send(struct svcxprt_rdma *rdma, struct ib_send_wr *wr)
 {
-	struct ib_send_wr *bad_wr;
 	int ret;
 
 	might_sleep();
@@ -311,7 +310,7 @@ int svc_rdma_send(struct svcxprt_rdma *rdma, struct ib_send_wr *wr)
 		}
 
 		svc_xprt_get(&rdma->sc_xprt);
-		ret = ib_post_send(rdma->sc_qp, wr, &bad_wr);
+		ret = ib_post_send(rdma->sc_qp, wr, NULL);
 		trace_svcrdma_post_send(wr, ret);
 		if (ret) {
 			set_bit(XPT_CLOSE, &rdma->sc_xprt.xpt_flags);