linux-kernel - Re: [PATCH 11/29] IB/mlx4: Use kmalloc

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Date:   Sun, 19 Feb 2017 17:21:57 +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 11/29] IB/mlx4: Use kmalloc_array() in three functions


> On Feb 18, 2017, at 11:07 PM, SF Markus Elfring <elfring@...rs.sourceforge.net> wrote:
> 
> From: Markus Elfring <elfring@...rs.sourceforge.net>
> Date: Sat, 18 Feb 2017 10:32:32 +0100
> 
> Multiplications for the size determination of memory allocations
> indicated that array data structures should be processed.
> Thus use the corresponding function "kmalloc_array".
> 
> This issue was detected by using the Coccinelle software.
> 
> Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
> ---
> drivers/infiniband/hw/mlx4/main.c | 14 +++++++++-----
> 1 file changed, 9 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/infiniband/hw/mlx4/main.c b/drivers/infiniband/hw/mlx4/main.c
> index ba6af84cc236..350c9148340e 100644
> --- a/drivers/infiniband/hw/mlx4/main.c
> +++ b/drivers/infiniband/hw/mlx4/main.c
> @@ -304,7 +304,9 @@ static int mlx4_ib_add_gid(struct ib_device *device,
>        ctx->refcount++;
>    }
>    if (!ret && hw_update) {
> -        gids = kmalloc(sizeof(*gids) * MLX4_MAX_PORT_GIDS, GFP_ATOMIC);
> +        gids = kmalloc_array(MLX4_MAX_PORT_GIDS,
> +                     sizeof(*gids),
> +                     GFP_ATOMIC);
>        if (!gids) {
>            ret = -ENOMEM;
>        } else {
> @@ -359,7 +361,9 @@ static int mlx4_ib_del_gid(struct ib_device *device,
>    if (!ret && hw_update) {
>        int i;
> 
> -        gids = kmalloc(sizeof(*gids) * MLX4_MAX_PORT_GIDS, GFP_ATOMIC);
> +        gids = kmalloc_array(MLX4_MAX_PORT_GIDS,
> +                     sizeof(*gids),
> +                     GFP_ATOMIC);
>        if (!gids) {
>            ret = -ENOMEM;
>        } else {
> @@ -2828,9 +2832,9 @@ static void *mlx4_ib_add(struct mlx4_dev *dev)
>            goto err_counter;
> 
>        ibdev->ib_uc_qpns_bitmap =
> -            kmalloc(BITS_TO_LONGS(ibdev->steer_qpn_count) *
> -                sizeof(long),
> -                GFP_KERNEL);
> +            kmalloc_array(BITS_TO_LONGS(ibdev->steer_qpn_count),
> +                      sizeof(long),
> +                      GFP_KERNEL);
>        if (!ibdev->ib_uc_qpns_bitmap)
>            goto err_steer_qp_release;
> 
> -- 
> 2.11.1
> 
> --
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Thanks,
Reviewed-by: Majd Dibbiny
<majd@...lanox.com>