fs/cifs: 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>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

fs/cifs/smbdirect.c

@@ -801,7 +801,7 @@ static int smbd_ia_open(
  */
 static int smbd_post_send_negotiate_req(struct smbd_connection *info)
 {
-	struct ib_send_wr send_wr, *send_wr_fail;
+	struct ib_send_wr send_wr;
 	int rc = -ENOMEM;
 	struct smbd_request *request;
 	struct smbd_negotiate_req *packet;
@@ -853,7 +853,7 @@ static int smbd_post_send_negotiate_req(struct smbd_connection *info)
 
 	request->has_payload = false;
 	atomic_inc(&info->send_pending);
-	rc = ib_post_send(info->id->qp, &send_wr, &send_wr_fail);
+	rc = ib_post_send(info->id->qp, &send_wr, NULL);
 	if (!rc)
 		return 0;
 
@@ -1023,7 +1023,7 @@ static void smbd_destroy_header(struct smbd_connection *info,
 static int smbd_post_send(struct smbd_connection *info,
 		struct smbd_request *request, bool has_payload)
 {
-	struct ib_send_wr send_wr, *send_wr_fail;
+	struct ib_send_wr send_wr;
 	int rc, i;
 
 	for (i = 0; i < request->num_sge; i++) {
@@ -1054,7 +1054,7 @@ static int smbd_post_send(struct smbd_connection *info,
 		atomic_inc(&info->send_pending);
 	}
 
-	rc = ib_post_send(info->id->qp, &send_wr, &send_wr_fail);
+	rc = ib_post_send(info->id->qp, &send_wr, NULL);
 	if (rc) {
 		log_rdma_send(ERR, "ib_post_send failed rc=%d\n", rc);
 		if (has_payload) {
@@ -1183,7 +1183,7 @@ static int smbd_post_send_data(
 static int smbd_post_recv(
 		struct smbd_connection *info, struct smbd_response *response)
 {
-	struct ib_recv_wr recv_wr, *recv_wr_fail = NULL;
+	struct ib_recv_wr recv_wr;
 	int rc = -EIO;
 
 	response->sge.addr = ib_dma_map_single(
@@ -1202,7 +1202,7 @@ static int smbd_post_recv(
 	recv_wr.sg_list = &response->sge;
 	recv_wr.num_sge = 1;
 
-	rc = ib_post_recv(info->id->qp, &recv_wr, &recv_wr_fail);
+	rc = ib_post_recv(info->id->qp, &recv_wr, NULL);
 	if (rc) {
 		ib_dma_unmap_single(info->id->device, response->sge.addr,
 				    response->sge.length, DMA_FROM_DEVICE);
@@ -2488,7 +2488,6 @@ struct smbd_mr *smbd_register_mr(
 	int rc, i;
 	enum dma_data_direction dir;
 	struct ib_reg_wr *reg_wr;
-	struct ib_send_wr *bad_wr;
 
 	if (num_pages > info->max_frmr_depth) {
 		log_rdma_mr(ERR, "num_pages=%d max_frmr_depth=%d\n",
@@ -2562,7 +2561,7 @@ struct smbd_mr *smbd_register_mr(
 	 * on IB_WR_REG_MR. Hardware enforces a barrier and order of execution
 	 * on the next ib_post_send when we actaully send I/O to remote peer
 	 */
-	rc = ib_post_send(info->id->qp, &reg_wr->wr, &bad_wr);
+	rc = ib_post_send(info->id->qp, &reg_wr->wr, NULL);
 	if (!rc)
 		return smbdirect_mr;
 
@@ -2607,7 +2606,7 @@ static void local_inv_done(struct ib_cq *cq, struct ib_wc *wc)
  */
 int smbd_deregister_mr(struct smbd_mr *smbdirect_mr)
 {
-	struct ib_send_wr *wr, *bad_wr;
+	struct ib_send_wr *wr;
 	struct smbd_connection *info = smbdirect_mr->conn;
 	int rc = 0;
 
@@ -2622,7 +2621,7 @@ int smbd_deregister_mr(struct smbd_mr *smbdirect_mr)
 		wr->send_flags = IB_SEND_SIGNALED;
 
 		init_completion(&smbdirect_mr->invalidate_done);
-		rc = ib_post_send(info->id->qp, wr, &bad_wr);
+		rc = ib_post_send(info->id->qp, wr, NULL);
 		if (rc) {
 			log_rdma_mr(ERR, "ib_post_send failed rc=%x\n", rc);
 			smbd_disconnect_rdma_connection(info);