netdev - Re: [PATCH 87/87] ethernet: mlx4: remove memset after dma_alloc

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Date:   Sun, 30 Jun 2019 12:15:33 +0000
From:   Tariq Toukan <tariqt@...lanox.com>
To:     Fuqian Huang <huangfq.daxian@...il.com>
CC:     Tariq Toukan <tariqt@...lanox.com>,
        "David S. Miller" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 87/87] ethernet: mlx4: remove memset after
 dma_alloc_coherent



On 6/27/2019 8:42 PM, Fuqian Huang wrote:
> In commit af7ddd8a627c
> ("Merge tag 'dma-mapping-4.21' of git://git.infradead.org/users/hch/dma-mapping"),
> dma_alloc_coherent has already zeroed the memory.
> So memset is not needed.
> 
> Signed-off-by: Fuqian Huang <huangfq.daxian@...il.com>
> ---
>   drivers/net/ethernet/mellanox/mlx4/eq.c | 2 --
>   1 file changed, 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/mellanox/mlx4/eq.c b/drivers/net/ethernet/mellanox/mlx4/eq.c
> index a5be27772b8e..c790a5fcea73 100644
> --- a/drivers/net/ethernet/mellanox/mlx4/eq.c
> +++ b/drivers/net/ethernet/mellanox/mlx4/eq.c
> @@ -1013,8 +1013,6 @@ static int mlx4_create_eq(struct mlx4_dev *dev, int nent,
>   
>   		dma_list[i] = t;
>   		eq->page_list[i].map = t;
> -
> -		memset(eq->page_list[i].buf, 0, PAGE_SIZE);
>   	}
>   
>   	eq->eqn = mlx4_bitmap_alloc(&priv->eq_table.bitmap);
> 

Reviewed-by: Tariq Toukan <tariqt@...lanox.com>

Thanks.