diff --git a/drivers/infiniband/hw/mlx4/mad.c b/drivers/infiniband/hw/mlx4/mad.c
index 68b3dfa922bf3e01ce3c00a60674ca508fd50912..1cd75ff0225193c475c9a9debe2ccedcf9bdb8b8 100644
--- a/drivers/infiniband/hw/mlx4/mad.c
+++ b/drivers/infiniband/hw/mlx4/mad.c
@@ -580,7 +580,7 @@ int mlx4_ib_send_to_slave(struct mlx4_ib_dev *dev, int slave, u8 port,
 
 	list.addr = tun_qp->tx_ring[tun_tx_ix].buf.map;
 	list.length = sizeof (struct mlx4_rcv_tunnel_mad);
-	list.lkey = tun_ctx->mr->lkey;
+	list.lkey = tun_ctx->pd->local_dma_lkey;
 
 	wr.wr.ud.ah = ah;
 	wr.wr.ud.port_num = port;
@@ -1133,7 +1133,7 @@ static int mlx4_ib_post_pv_qp_buf(struct mlx4_ib_demux_pv_ctx *ctx,
 
 	sg_list.addr = tun_qp->ring[index].map;
 	sg_list.length = size;
-	sg_list.lkey = ctx->mr->lkey;
+	sg_list.lkey = ctx->pd->local_dma_lkey;
 
 	recv_wr.next = NULL;
 	recv_wr.sg_list = &sg_list;
@@ -1244,7 +1244,7 @@ int mlx4_ib_send_to_wire(struct mlx4_ib_dev *dev, int slave, u8 port,
 
 	list.addr = sqp->tx_ring[wire_tx_ix].buf.map;
 	list.length = sizeof (struct mlx4_mad_snd_buf);
-	list.lkey = sqp_ctx->mr->lkey;
+	list.lkey = sqp_ctx->pd->local_dma_lkey;
 
 	wr.wr.ud.ah = ah;
 	wr.wr.ud.port_num = port;
@@ -1827,19 +1827,12 @@ static int create_pv_resources(struct ib_device *ibdev, int slave, int port,
 		goto err_cq;
 	}
 
-	ctx->mr = ib_get_dma_mr(ctx->pd, IB_ACCESS_LOCAL_WRITE);
-	if (IS_ERR(ctx->mr)) {
-		ret = PTR_ERR(ctx->mr);
-		pr_err("Couldn't get tunnel DMA MR (%d)\n", ret);
-		goto err_pd;
-	}
-
 	if (ctx->has_smi) {
 		ret = create_pv_sqp(ctx, IB_QPT_SMI, create_tun);
 		if (ret) {
 			pr_err("Couldn't create %s QP0 (%d)\n",
 			       create_tun ? "tunnel for" : "",  ret);
-			goto err_mr;
+			goto err_pd;
 		}
 	}
 
@@ -1876,10 +1869,6 @@ static int create_pv_resources(struct ib_device *ibdev, int slave, int port,
 		ib_destroy_qp(ctx->qp[0].qp);
 	ctx->qp[0].qp = NULL;
 
-err_mr:
-	ib_dereg_mr(ctx->mr);
-	ctx->mr = NULL;
-
 err_pd:
 	ib_dealloc_pd(ctx->pd);
 	ctx->pd = NULL;
@@ -1916,8 +1905,6 @@ static void destroy_pv_resources(struct mlx4_ib_dev *dev, int slave, int port,
 		ib_destroy_qp(ctx->qp[1].qp);
 		ctx->qp[1].qp = NULL;
 		mlx4_ib_free_pv_qp_bufs(ctx, IB_QPT_GSI, 1);
-		ib_dereg_mr(ctx->mr);
-		ctx->mr = NULL;
 		ib_dealloc_pd(ctx->pd);
 		ctx->pd = NULL;
 		ib_destroy_cq(ctx->cq);
@@ -2050,8 +2037,6 @@ static void mlx4_ib_free_sqp_ctx(struct mlx4_ib_demux_pv_ctx *sqp_ctx)
 		ib_destroy_qp(sqp_ctx->qp[1].qp);
 		sqp_ctx->qp[1].qp = NULL;
 		mlx4_ib_free_pv_qp_bufs(sqp_ctx, IB_QPT_GSI, 0);
-		ib_dereg_mr(sqp_ctx->mr);
-		sqp_ctx->mr = NULL;
 		ib_dealloc_pd(sqp_ctx->pd);
 		sqp_ctx->pd = NULL;
 		ib_destroy_cq(sqp_ctx->cq);
diff --git a/drivers/infiniband/hw/mlx4/mlx4_ib.h b/drivers/infiniband/hw/mlx4/mlx4_ib.h
index cb47c2cb84ca4aa1c4d41a3076303d88b9c1f2c1..fe52ead0ebda029f413cd9d2f75df245181ba7a3 100644
--- a/drivers/infiniband/hw/mlx4/mlx4_ib.h
+++ b/drivers/infiniband/hw/mlx4/mlx4_ib.h
@@ -415,7 +415,6 @@ struct mlx4_ib_demux_pv_ctx {
 	struct ib_device *ib_dev;
 	struct ib_cq *cq;
 	struct ib_pd *pd;
-	struct ib_mr *mr;
 	struct work_struct work;
 	struct workqueue_struct *wq;
 	struct mlx4_ib_demux_pv_qp qp[2];