IB/srpt: 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: Max Gurtovoy <maxg@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/ulp/srpt/ib_srpt.c

@@ -816,7 +816,7 @@ static int srpt_post_recv(struct srpt_device *sdev, struct srpt_rdma_ch *ch,
 			  struct srpt_recv_ioctx *ioctx)
 {
 	struct ib_sge list;
-	struct ib_recv_wr wr, *bad_wr;
+	struct ib_recv_wr wr;
 
 	BUG_ON(!sdev);
 	list.addr = ioctx->ioctx.dma;
@@ -830,9 +830,9 @@ static int srpt_post_recv(struct srpt_device *sdev, struct srpt_rdma_ch *ch,
 	wr.num_sge = 1;
 
 	if (sdev->use_srq)
-		return ib_post_srq_recv(sdev->srq, &wr, &bad_wr);
+		return ib_post_srq_recv(sdev->srq, &wr, NULL);
 	else
-		return ib_post_recv(ch->qp, &wr, &bad_wr);
+		return ib_post_recv(ch->qp, &wr, NULL);
 }
 
 /**
@@ -846,7 +846,6 @@ static int srpt_post_recv(struct srpt_device *sdev, struct srpt_rdma_ch *ch,
  */
 static int srpt_zerolength_write(struct srpt_rdma_ch *ch)
 {
-	struct ib_send_wr *bad_wr;
 	struct ib_rdma_wr wr = {
 		.wr = {
 			.next		= NULL,
@@ -859,7 +858,7 @@ static int srpt_zerolength_write(struct srpt_rdma_ch *ch)
 	pr_debug("%s-%d: queued zerolength write\n", ch->sess_name,
 		 ch->qp->qp_num);
 
-	return ib_post_send(ch->qp, &wr.wr, &bad_wr);
+	return ib_post_send(ch->qp, &wr.wr, NULL);
 }
 
 static void srpt_zerolength_write_done(struct ib_cq *cq, struct ib_wc *wc)
@@ -2624,7 +2623,7 @@ static int srpt_write_pending(struct se_cmd *se_cmd)
 	struct srpt_send_ioctx *ioctx =
 		container_of(se_cmd, struct srpt_send_ioctx, cmd);
 	struct srpt_rdma_ch *ch = ioctx->ch;
-	struct ib_send_wr *first_wr = NULL, *bad_wr;
+	struct ib_send_wr *first_wr = NULL;
 	struct ib_cqe *cqe = &ioctx->rdma_cqe;
 	enum srpt_command_state new_state;
 	int ret, i;
@@ -2648,7 +2647,7 @@ static int srpt_write_pending(struct se_cmd *se_cmd)
 		cqe = NULL;
 	}
 
-	ret = ib_post_send(ch->qp, first_wr, &bad_wr);
+	ret = ib_post_send(ch->qp, first_wr, NULL);
 	if (ret) {
 		pr_err("%s: ib_post_send() returned %d for %d (avail: %d)\n",
 			 __func__, ret, ioctx->n_rdma,
@@ -2686,7 +2685,7 @@ static void srpt_queue_response(struct se_cmd *cmd)
 		container_of(cmd, struct srpt_send_ioctx, cmd);
 	struct srpt_rdma_ch *ch = ioctx->ch;
 	struct srpt_device *sdev = ch->sport->sdev;
-	struct ib_send_wr send_wr, *first_wr = &send_wr, *bad_wr;
+	struct ib_send_wr send_wr, *first_wr = &send_wr;
 	struct ib_sge sge;
 	enum srpt_command_state state;
 	int resp_len, ret, i;
@@ -2759,7 +2758,7 @@ static void srpt_queue_response(struct se_cmd *cmd)
 	send_wr.opcode = IB_WR_SEND;
 	send_wr.send_flags = IB_SEND_SIGNALED;
 
-	ret = ib_post_send(ch->qp, first_wr, &bad_wr);
+	ret = ib_post_send(ch->qp, first_wr, NULL);
 	if (ret < 0) {
 		pr_err("%s: sending cmd response failed for tag %llu (%d)\n",
 			__func__, ioctx->cmd.tag, ret);