linux-kernel - [PATCH] net/mlx4: Fix error check for dma_map

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Message-Id: <20220825063533.21015-1-jinpu.wang@ionos.com>
Date:   Thu, 25 Aug 2022 08:35:33 +0200
From:   Jack Wang <jinpu.wang@...os.com>
To:     kuba@...nel.org, davem@...emloft.net
Cc:     Tariq Toukan <tariqt@...dia.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
        Leon Romanovsky <leonro@...dia.com>
Subject: [PATCH] net/mlx4: Fix error check for dma_map_sg

dma_map_sg return 0 on error.

Cc: Tariq Toukan <tariqt@...dia.com>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Eric Dumazet <edumazet@...gle.com>
Cc: Jakub Kicinski <kuba@...nel.org>
Cc: Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org
Cc: linux-rdma@...r.kernel.org
Cc: linux-kernel@...r.kernel.org

Signed-off-by: Jack Wang <jinpu.wang@...os.com>
Reviewed-by: Leon Romanovsky <leonro@...dia.com>
---
 drivers/net/ethernet/mellanox/mlx4/icm.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx4/icm.c b/drivers/net/ethernet/mellanox/mlx4/icm.c
index d89a3da89e5a..59b8b3c73582 100644
--- a/drivers/net/ethernet/mellanox/mlx4/icm.c
+++ b/drivers/net/ethernet/mellanox/mlx4/icm.c
@@ -208,7 +208,7 @@ struct mlx4_icm *mlx4_alloc_icm(struct mlx4_dev *dev, int npages,
 						chunk->sg, chunk->npages,
 						DMA_BIDIRECTIONAL);
 
-			if (chunk->nsg <= 0)
+			if (!chunk->nsg)
 				goto fail;
 		}
 
@@ -222,7 +222,7 @@ struct mlx4_icm *mlx4_alloc_icm(struct mlx4_dev *dev, int npages,
 		chunk->nsg = dma_map_sg(&dev->persist->pdev->dev, chunk->sg,
 					chunk->npages, DMA_BIDIRECTIONAL);
 
-		if (chunk->nsg <= 0)
+		if (!chunk->nsg)
 			goto fail;
 	}
 
-- 
2.34.1