linux-kernel - Re: [PATCH 01/29] IB/mlx4: Use kcalloc() in mlx4_ib_alloc_pv

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Date:   Sun, 19 Feb 2017 17:06:25 +0000
From:   Majd Dibbiny <majd@...lanox.com>
To:     SF Markus Elfring <elfring@...rs.sourceforge.net>
CC:     "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        Doug Ledford <dledford@...hat.com>,
        Hal Rosenstock <hal.rosenstock@...il.com>,
        "Leon Romanovsky" <leonro@...lanox.com>,
        Matan Barak <matanb@...lanox.com>,
        "Sean Hefty" <sean.hefty@...el.com>,
        Yishai Hadas <yishaih@...lanox.com>,
        LKML <linux-kernel@...r.kernel.org>,
        "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>
Subject: Re: [PATCH 01/29] IB/mlx4: Use kcalloc() in mlx4_ib_alloc_pv_bufs()


> On Feb 18, 2017, at 10:55 PM, SF Markus Elfring <elfring@...rs.sourceforge.net> wrote:
> 
> From: Markus Elfring <elfring@...rs.sourceforge.net>
> Date: Fri, 17 Feb 2017 20:00:34 +0100
> 
> * A multiplication for the size determination of a memory allocation
>  indicated that an array data structure should be processed.
>  Thus use the corresponding function "kcalloc".
> 
>  This issue was detected by using the Coccinelle software.
> 
> * Replace the specification of a data structure by a pointer dereference
>  to make the corresponding size determination a bit safer according to
>  the Linux coding style convention.
> 
> Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
> ---
> drivers/infiniband/hw/mlx4/mad.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/infiniband/hw/mlx4/mad.c b/drivers/infiniband/hw/mlx4/mad.c
> index db564ccc0f92..61bd81baeb29 100644
> --- a/drivers/infiniband/hw/mlx4/mad.c
> +++ b/drivers/infiniband/hw/mlx4/mad.c
> @@ -1600,8 +1600,8 @@ static int mlx4_ib_alloc_pv_bufs(struct mlx4_ib_demux_pv_ctx *ctx,
>        return -EINVAL;
> 
>    tun_qp = &ctx->qp[qp_type];
> -
> -    tun_qp->ring = kzalloc(sizeof (struct mlx4_ib_buf) * MLX4_NUM_TUNNEL_BUFS,
> +    tun_qp->ring = kcalloc(MLX4_NUM_TUNNEL_BUFS,
> +                   sizeof(*tun_qp->ring),
>                   GFP_KERNEL);
>    if (!tun_qp->ring)
>        return -ENOMEM;
> -- 
> 2.11.1
> 
> --
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Thanks,
Reviewed-by: Majd Dibbiny
<majd@...lanox.com>