linux-kernel - Re: [PATCH 1/8] net/mlx4: use kzalloc instead of kmalloc

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Date:   Thu, 28 Feb 2019 08:40:35 +0000
From:   Tariq Toukan <tariqt@...lanox.com>
To:     Robert Eshleman <bobbyeshleman@...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 1/8] net/mlx4: use kzalloc instead of kmalloc



On 2/27/2019 8:09 AM, Robert Eshleman wrote:
> This patch replaces a kmalloc/memset(,0) call with a call to kzalloc.
> It also removes a memset(,0) call that always follows a *zalloc call.
> 
> Signed-off-by: Robert Eshleman <bobbyeshleman@...il.com>
> ---
>   drivers/net/ethernet/mellanox/mlx4/cmd.c   | 1 -
>   drivers/net/ethernet/mellanox/mlx4/en_rx.c | 3 +--
>   2 files changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/drivers/net/ethernet/mellanox/mlx4/cmd.c b/drivers/net/ethernet/mellanox/mlx4/cmd.c
> index e65bc3c95630..7bfa6e850e5f 100644
> --- a/drivers/net/ethernet/mellanox/mlx4/cmd.c
> +++ b/drivers/net/ethernet/mellanox/mlx4/cmd.c
> @@ -3307,7 +3307,6 @@ int mlx4_get_counter_stats(struct mlx4_dev *dev, int counter_index,
>   	if (IS_ERR(mailbox))
>   		return PTR_ERR(mailbox);
>   
> -	memset(mailbox->buf, 0, sizeof(struct mlx4_counter));
>   	if_stat_in_mod = counter_index;
>   	if (reset)
>   		if_stat_in_mod |= MLX4_QUERY_IF_STAT_RESET;
> diff --git a/drivers/net/ethernet/mellanox/mlx4/en_rx.c b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
> index 9a0881cb7f51..f55805d206ef 100644
> --- a/drivers/net/ethernet/mellanox/mlx4/en_rx.c
> +++ b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
> @@ -1044,7 +1044,7 @@ static int mlx4_en_config_rss_qp(struct mlx4_en_priv *priv, int qpn,
>   	struct mlx4_qp_context *context;
>   	int err = 0;
>   
> -	context = kmalloc(sizeof(*context), GFP_KERNEL);
> +	context = kzalloc(sizeof(*context), GFP_KERNEL);
>   	if (!context)
>   		return -ENOMEM;
>   
> @@ -1055,7 +1055,6 @@ static int mlx4_en_config_rss_qp(struct mlx4_en_priv *priv, int qpn,
>   	}
>   	qp->event = mlx4_en_sqp_event;
>   
> -	memset(context, 0, sizeof(*context));
>   	mlx4_en_fill_qp_context(priv, ring->actual_size, ring->stride, 0, 0,
>   				qpn, ring->cqn, -1, context);
>   	context->db_rec_addr = cpu_to_be64(ring->wqres.db.dma);
> 

Hi,

Thanks for your patch.
It looks good, but misses one similar point you might want to cover:

in drivers/net/ethernet/mellanox/mlx4/port.c:1780 :
memset(context, 0, sizeof(*context));

Tariq