infiniband/mlx4: check for mapping error

Since ib_dma_map_single can fail use ib_dma_mapping_error to check
for errors.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Acked-by: Jack Morgenstein <jackm@dev.mellanox.co.il>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/hw/mlx4/mad.c

@@ -1430,6 +1430,10 @@ static int mlx4_ib_alloc_pv_bufs(struct mlx4_ib_demux_pv_ctx *ctx,
 							tun_qp->ring[i].addr,
 							rx_buf_size,
 							DMA_FROM_DEVICE);
+		if (ib_dma_mapping_error(ctx->ib_dev, tun_qp->ring[i].map)) {
+			kfree(tun_qp->ring[i].addr);
+			goto err;
+		}
 	}
 
 	for (i = 0; i < MLX4_NUM_TUNNEL_BUFS; i++) {
@@ -1442,6 +1446,11 @@ static int mlx4_ib_alloc_pv_bufs(struct mlx4_ib_demux_pv_ctx *ctx,
 					  tun_qp->tx_ring[i].buf.addr,
 					  tx_buf_size,
 					  DMA_TO_DEVICE);
+		if (ib_dma_mapping_error(ctx->ib_dev,
+					 tun_qp->tx_ring[i].buf.map)) {
+			kfree(tun_qp->tx_ring[i].buf.addr);
+			goto tx_err;
+		}
 		tun_qp->tx_ring[i].ah = NULL;
 	}
 	spin_lock_init(&tun_qp->tx_lock);

drivers/infiniband/hw/mlx4/qp.c

@@ -566,6 +566,10 @@ static int alloc_proxy_bufs(struct ib_device *dev, struct mlx4_ib_qp *qp)
 			ib_dma_map_single(dev, qp->sqp_proxy_rcv[i].addr,
 					  sizeof (struct mlx4_ib_proxy_sqp_hdr),
 					  DMA_FROM_DEVICE);
+		if (ib_dma_mapping_error(dev, qp->sqp_proxy_rcv[i].map)) {
+			kfree(qp->sqp_proxy_rcv[i].addr);
+			goto err;
+		}
 	}
 	return 0;