net/rds: 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>
Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

net/rds/ib_frmr.c

@@ -102,7 +102,6 @@ static void rds_ib_free_frmr(struct rds_ib_mr *ibmr, bool drop)
 static int rds_ib_post_reg_frmr(struct rds_ib_mr *ibmr)
 {
 	struct rds_ib_frmr *frmr = &ibmr->u.frmr;
-	struct ib_send_wr *failed_wr;
 	struct ib_reg_wr reg_wr;
 	int ret, off = 0;
 
@@ -135,8 +134,7 @@ static int rds_ib_post_reg_frmr(struct rds_ib_mr *ibmr)
 			IB_ACCESS_REMOTE_WRITE;
 	reg_wr.wr.send_flags = IB_SEND_SIGNALED;
 
-	failed_wr = &reg_wr.wr;
-	ret = ib_post_send(ibmr->ic->i_cm_id->qp, &reg_wr.wr, &failed_wr);
+	ret = ib_post_send(ibmr->ic->i_cm_id->qp, &reg_wr.wr, NULL);
 	if (unlikely(ret)) {
 		/* Failure here can be because of -ENOMEM as well */
 		frmr->fr_state = FRMR_IS_STALE;
@@ -229,7 +227,7 @@ static int rds_ib_map_frmr(struct rds_ib_device *rds_ibdev,
 
 static int rds_ib_post_inv(struct rds_ib_mr *ibmr)
 {
-	struct ib_send_wr *s_wr, *failed_wr;
+	struct ib_send_wr *s_wr;
 	struct rds_ib_frmr *frmr = &ibmr->u.frmr;
 	struct rdma_cm_id *i_cm_id = ibmr->ic->i_cm_id;
 	int ret = -EINVAL;
@@ -254,8 +252,7 @@ static int rds_ib_post_inv(struct rds_ib_mr *ibmr)
 	s_wr->ex.invalidate_rkey = frmr->mr->rkey;
 	s_wr->send_flags = IB_SEND_SIGNALED;
 
-	failed_wr = s_wr;
-	ret = ib_post_send(i_cm_id->qp, s_wr, &failed_wr);
+	ret = ib_post_send(i_cm_id->qp, s_wr, NULL);
 	if (unlikely(ret)) {
 		frmr->fr_state = FRMR_IS_STALE;
 		frmr->fr_inv = false;

net/rds/ib_recv.c

@@ -383,7 +383,6 @@ void rds_ib_recv_refill(struct rds_connection *conn, int prefill, gfp_t gfp)
 {
 	struct rds_ib_connection *ic = conn->c_transport_data;
 	struct rds_ib_recv_work *recv;
-	struct ib_recv_wr *failed_wr;
 	unsigned int posted = 0;
 	int ret = 0;
 	bool can_wait = !!(gfp & __GFP_DIRECT_RECLAIM);
@@ -417,7 +416,7 @@ void rds_ib_recv_refill(struct rds_connection *conn, int prefill, gfp_t gfp)
 				&recv->r_frag->f_sg));
 
 		/* XXX when can this fail? */
-		ret = ib_post_recv(ic->i_cm_id->qp, &recv->r_wr, &failed_wr);
+		ret = ib_post_recv(ic->i_cm_id->qp, &recv->r_wr, NULL);
 		if (ret) {
 			rds_ib_conn_error(conn, "recv post on "
 			       "%pI4 returned %d, disconnecting and "
@@ -650,7 +649,6 @@ static u64 rds_ib_get_ack(struct rds_ib_connection *ic)
 static void rds_ib_send_ack(struct rds_ib_connection *ic, unsigned int adv_credits)
 {
 	struct rds_header *hdr = ic->i_ack;
-	struct ib_send_wr *failed_wr;
 	u64 seq;
 	int ret;
 
@@ -663,7 +661,7 @@ static void rds_ib_send_ack(struct rds_ib_connection *ic, unsigned int adv_credi
 	rds_message_make_checksum(hdr);
 	ic->i_ack_queued = jiffies;
 
-	ret = ib_post_send(ic->i_cm_id->qp, &ic->i_ack_wr, &failed_wr);
+	ret = ib_post_send(ic->i_cm_id->qp, &ic->i_ack_wr, NULL);
 	if (unlikely(ret)) {
 		/* Failed to send. Release the WR, and
 		 * force another ACK.