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Re: [PATCH 22/29] IB/mlx4: Use kmalloc_array() in alloc_proxy_bufs()

From Majd Dibbiny <majd@mellanox.com>
Newsgroups linux.kernel
Subject Re: [PATCH 22/29] IB/mlx4: Use kmalloc_array() in alloc_proxy_bufs()
Date 2017-02-19 21:00 +0100
Message-ID <tcFOh-35c-5@gated-at.bofh.it> (permalink)
References <tcFOh-35c-7@gated-at.bofh.it> <tckA9-73M-3@gated-at.bofh.it>
Organization linux.* mail to news gateway

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> On Feb 18, 2017, at 11:12 PM, SF Markus Elfring <elfring@users.sourceforge.net> wrote:
> 
> From: Markus Elfring <elfring@users.sourceforge.net>
> Date: Sat, 18 Feb 2017 16:56:52 +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 "kmalloc_array".
> 
>  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@users.sourceforge.net>
> ---
> drivers/infiniband/hw/mlx4/qp.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/infiniband/hw/mlx4/qp.c b/drivers/infiniband/hw/mlx4/qp.c
> index 7d76f769233c..11fec4a8fae5 100644
> --- a/drivers/infiniband/hw/mlx4/qp.c
> +++ b/drivers/infiniband/hw/mlx4/qp.c
> @@ -554,9 +554,9 @@ static int alloc_proxy_bufs(struct ib_device *dev, struct mlx4_ib_qp *qp)
> {
>    int i;
> 
> -    qp->sqp_proxy_rcv =
> -        kmalloc(sizeof (struct mlx4_ib_buf) * qp->rq.wqe_cnt,
> -            GFP_KERNEL);
> +    qp->sqp_proxy_rcv = kmalloc_array(qp->rq.wqe_cnt,
> +                      sizeof(*qp->sqp_proxy_rcv),
> +                      GFP_KERNEL);
>    if (!qp->sqp_proxy_rcv)
>        return -ENOMEM;
>    for (i = 0; i < qp->rq.wqe_cnt; i++) {
> -- 
> 2.11.1
> 
> --
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Thanks,
Reviewed-by: Majd Dibbiny
<majd@mellanox.com>

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[PATCH 00/29] IB/mlx: Fine-tuning for several function  implementations SF Markus Elfring <elfring@users.sourceforge.net> - 2017-02-18 21:50 +0100
  [PATCH 04/29] IB/mlx4: Improve another size determination in  alloc_pv_object() SF Markus Elfring <elfring@users.sourceforge.net> - 2017-02-18 22:00 +0100
    Re: [PATCH 04/29] IB/mlx4: Improve another size determination in  alloc_pv_object() Majd Dibbiny <majd@mellanox.com> - 2017-02-19 18:10 +0100
  [PATCH 01/29] IB/mlx4: Use kcalloc() in mlx4_ib_alloc_pv_bufs() SF Markus Elfring <elfring@users.sourceforge.net> - 2017-02-18 22:00 +0100
    Re: [PATCH 01/29] IB/mlx4: Use kcalloc() in mlx4_ib_alloc_pv_bufs() Majd Dibbiny <majd@mellanox.com> - 2017-02-19 18:10 +0100
  [PATCH 09/29] IB/mlx4: Move an assignment out of a check in  forward_trap() SF Markus Elfring <elfring@users.sourceforge.net> - 2017-02-18 22:00 +0100
    Re: [PATCH 09/29] IB/mlx4: Move an assignment out of a check in  forward_trap() Majd Dibbiny <majd@mellanox.com> - 2017-02-19 18:20 +0100
  [PATCH 03/29] IB/mlx4: Improve another size determination in  mlx4_ib_alloc_demux_ctx() SF Markus Elfring <elfring@users.sourceforge.net> - 2017-02-18 22:00 +0100
    Re: [PATCH 03/29] IB/mlx4: Improve another size determination in  mlx4_ib_alloc_demux_ctx() Majd Dibbiny <majd@mellanox.com> - 2017-02-19 18:10 +0100
  [PATCH 06/29] IB/mlx4: Delete three unnecessary return statements SF Markus Elfring <elfring@users.sourceforge.net> - 2017-02-18 22:00 +0100
    Re: [PATCH 06/29] IB/mlx4: Delete three unnecessary return statements Majd Dibbiny <majd@mellanox.com> - 2017-02-19 18:10 +0100
  [PATCH 05/29] IB/mlx4: Fix a typo in a comment line SF Markus Elfring <elfring@users.sourceforge.net> - 2017-02-18 22:00 +0100
    Re: [PATCH 05/29] IB/mlx4: Fix a typo in a comment line Majd Dibbiny <majd@mellanox.com> - 2017-02-19 18:10 +0100
  [PATCH 07/29] IB/mlx4: Split a condition check in  handle_slaves_guid_change() SF Markus Elfring <elfring@users.sourceforge.net> - 2017-02-18 22:00 +0100
    Re: [PATCH 07/29] IB/mlx4: Split a condition check in  handle_slaves_guid_change() Majd Dibbiny <majd@mellanox.com> - 2017-02-19 18:10 +0100
  [PATCH 10/29] IB/mlx4: Enclose 15 expressions for the sizeof operator  by parentheses SF Markus Elfring <elfring@users.sourceforge.net> - 2017-02-18 22:00 +0100
    Re: [PATCH 10/29] IB/mlx4: Enclose 15 expressions for the sizeof  operator by parentheses Majd Dibbiny <majd@mellanox.com> - 2017-02-19 18:30 +0100
  [PATCH 15/29] IB/mlx4: Delete an unnecessary return statement in  do_slave_init() SF Markus Elfring <elfring@users.sourceforge.net> - 2017-02-18 22:10 +0100
    Re: [PATCH 15/29] IB/mlx4: Delete an unnecessary return statement in  do_slave_init() Majd Dibbiny <majd@mellanox.com> - 2017-02-19 23:40 +0100
  [PATCH 11/29] IB/mlx4: Use kmalloc_array() in three functions SF Markus Elfring <elfring@users.sourceforge.net> - 2017-02-18 22:10 +0100
    Re: [PATCH 11/29] IB/mlx4: Use kmalloc_array() in three functions Majd Dibbiny <majd@mellanox.com> - 2017-02-19 18:30 +0100
  [PATCH 13/29] IB/mlx4: Split a condition check in five functions SF Markus Elfring <elfring@users.sourceforge.net> - 2017-02-18 22:10 +0100
    Re: [PATCH 13/29] IB/mlx4: Split a condition check in five functions Majd Dibbiny <majd@mellanox.com> - 2017-02-19 18:30 +0100
  [PATCH 12/29] IB/mlx4: Enclose 17 expressions for the sizeof operator  by parentheses SF Markus Elfring <elfring@users.sourceforge.net> - 2017-02-18 22:10 +0100
    Re: [PATCH 12/29] IB/mlx4: Enclose 17 expressions for the sizeof  operator by parentheses Majd Dibbiny <majd@mellanox.com> - 2017-02-19 18:30 +0100
  [PATCH 18/29] IB/mlx4: Delete an unnecessary variable initialisation  in mlx4_ib_add() SF Markus Elfring <elfring@users.sourceforge.net> - 2017-02-18 22:10 +0100
  [PATCH 19/29] IB/mlx4: Delete an unnecessary variable assignment in  mlx4_ib_add() SF Markus Elfring <elfring@users.sourceforge.net> - 2017-02-18 22:10 +0100
    Re: [PATCH 19/29] IB/mlx4: Delete an unnecessary variable assignment  in mlx4_ib_add() Majd Dibbiny <majd@mellanox.com> - 2017-02-19 20:50 +0100
  [PATCH 14/29] IB/mlx4: Delete an unnecessary variable in  __mlx4_ib_query_gid() SF Markus Elfring <elfring@users.sourceforge.net> - 2017-02-18 22:10 +0100
  [PATCH 17/29] IB/mlx4: Improve another size determination in  mlx4_ib_add() SF Markus Elfring <elfring@users.sourceforge.net> - 2017-02-18 22:10 +0100
    Re: [PATCH 17/29] IB/mlx4: Improve another size determination in  mlx4_ib_add() Majd Dibbiny <majd@mellanox.com> - 2017-02-19 18:40 +0100
    Re: [PATCH 17/29] IB/mlx4: Improve another size determination in  mlx4_ib_add() Majd Dibbiny <majd@mellanox.com> - 2017-02-19 18:40 +0100
  [PATCH 22/29] IB/mlx4: Use kmalloc_array() in alloc_proxy_bufs() SF Markus Elfring <elfring@users.sourceforge.net> - 2017-02-18 22:20 +0100
    Re: [PATCH 22/29] IB/mlx4: Use kmalloc_array() in alloc_proxy_bufs() Majd Dibbiny <majd@mellanox.com> - 2017-02-19 21:00 +0100
  [PATCH 20/29] IB/mlx4: Delete an error message for a failed memory  allocation in mlx4_ib_add() SF Markus Elfring <elfring@users.sourceforge.net> - 2017-02-18 22:20 +0100
    Re: [PATCH 20/29] IB/mlx4: Delete an error message for a failed  memory allocation in mlx4_ib_add() Majd Dibbiny <majd@mellanox.com> - 2017-02-19 20:50 +0100
  [PATCH 21/29] IB/mlx4: Delete unnecessary braces in mlx4_ib_add() SF Markus Elfring <elfring@users.sourceforge.net> - 2017-02-18 22:20 +0100
    Re: [PATCH 21/29] IB/mlx4: Delete unnecessary braces in mlx4_ib_add() Majd Dibbiny <majd@mellanox.com> - 2017-02-19 21:10 +0100
  [PATCH 29/29] IB/mlx5: Use kmalloc_array() in create_srq_kernel() SF Markus Elfring <elfring@users.sourceforge.net> - 2017-02-18 22:20 +0100
  [PATCH 24/29] IB/mlx4: Delete unwanted spaces behind usages of the  sizeof operator SF Markus Elfring <elfring@users.sourceforge.net> - 2017-02-18 22:20 +0100
  [PATCH 28/29] IB/mlx5: Less function calls in create_kernel_qp()  after error detection SF Markus Elfring <elfring@users.sourceforge.net> - 2017-02-18 22:20 +0100
  [PATCH 27/29] IB/mlx5: Use kmalloc_array() in create_kernel_qp() SF Markus Elfring <elfring@users.sourceforge.net> - 2017-02-18 22:20 +0100
  [PATCH 23/29] IB/mlx4: Improve size determinations in  create_qp_common() SF Markus Elfring <elfring@users.sourceforge.net> - 2017-02-18 22:20 +0100
    Re: [PATCH 23/29] IB/mlx4: Improve size determinations in  create_qp_common() Majd Dibbiny <majd@mellanox.com> - 2017-02-19 21:00 +0100
  [PATCH 16/29] IB/mlx4: Improve another size determination in  do_slave_init() SF Markus Elfring <elfring@users.sourceforge.net> - 2017-02-18 22:20 +0100
  [PATCH 08/29] IB/mlx4: Delete an unnecessary check before the  function call "kfree" in free_pv_object() SF Markus Elfring <elfring@users.sourceforge.net> - 2017-02-18 22:30 +0100
    Re: [PATCH 08/29] IB/mlx4: Delete an unnecessary check before the  function call "kfree" in free_pv_object() Majd Dibbiny <majd@mellanox.com> - 2017-02-19 18:20 +0100
  [PATCH 26/29] IB/mlx4: Enclose 14 expressions for the sizeof operator  by parentheses SF Markus Elfring <elfring@users.sourceforge.net> - 2017-02-18 22:30 +0100
  [PATCH 25/29] IB/mlx4: Add spaces for better code readability SF Markus Elfring <elfring@users.sourceforge.net> - 2017-02-18 22:50 +0100

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