From: Ilya Lesokhin <ilyal@mellanox.com>
Date: Mon, 28 Aug 2017 09:47:32 +0300
Subject: net/mlx5: FPGA, Call DMA unmap with the right size
Patch-mainline: v4.18-rc1
Git-commit: 36dd4902004c39b7e8a16a7cf1535faa7ecfa921
References: bsc#1046303 FATE#322944

When mlx5_fpga_conn_unmap_buf is called buf->sg[0].size
should equal the actual buffer size, not the message size.
Otherwise we will trigger the following dma debug warning
"DMA-API: device driver frees DMA memory with different size"

Fixes: 537a50574175 ('net/mlx5: FPGA, Add high-speed connection routines')
Signed-off-by: Ilya Lesokhin <ilyal@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/mellanox/mlx5/core/fpga/conn.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/drivers/net/ethernet/mellanox/mlx5/core/fpga/conn.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/fpga/conn.c
@@ -255,8 +255,6 @@ static void mlx5_fpga_conn_rq_cqe(struct
 	ix = be16_to_cpu(cqe->wqe_counter) & (conn->qp.rq.size - 1);
 	buf = conn->qp.rq.bufs[ix];
 	conn->qp.rq.bufs[ix] = NULL;
-	if (!status)
-		buf->sg[0].size = be32_to_cpu(cqe->byte_cnt);
 	conn->qp.rq.cc++;
 
 	if (unlikely(status && (status != MLX5_CQE_SYNDROME_WR_FLUSH_ERR)))
@@ -274,6 +272,7 @@ static void mlx5_fpga_conn_rq_cqe(struct
 		return;
 	}
 
+	buf->sg[0].size = be32_to_cpu(cqe->byte_cnt);
 	mlx5_fpga_dbg(conn->fdev, "Message with %u bytes received successfully\n",
 		      buf->sg[0].size);
 	conn->recv_cb(conn->cb_arg, buf);