linux-kernel - Re: [PATCH 1/5] IB/qib: Use kcalloc() in qib_init_iba7322

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Message-ID: <20170405143438.GC5006@yuval-lap>
Date:   Wed, 5 Apr 2017 17:34:39 +0300
From:   Yuval Shaia <yuval.shaia@...cle.com>
To:     SF Markus Elfring <elfring@...rs.sourceforge.net>
Cc:     linux-rdma@...r.kernel.org, Doug Ledford <dledford@...hat.com>,
        Hal Rosenstock <hal.rosenstock@...il.com>,
        Mike Marciniszyn <infinipath@...el.com>,
        Sean Hefty <sean.hefty@...el.com>,
        LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 1/5] IB/qib: Use kcalloc() in qib_init_iba7322_funcs()

On Wed, Apr 05, 2017 at 03:51:52PM +0200, SF Markus Elfring wrote:
> From: Markus Elfring <elfring@...rs.sourceforge.net>
> Date: Wed, 5 Apr 2017 09:43:54 +0200
> 
> * 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/qib/qib_iba7322.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/infiniband/hw/qib/qib_iba7322.c b/drivers/infiniband/hw/qib/qib_iba7322.c
> index af9f596bb68b..e4e4e675c89c 100644
> --- a/drivers/infiniband/hw/qib/qib_iba7322.c
> +++ b/drivers/infiniband/hw/qib/qib_iba7322.c
> @@ -7324,8 +7324,9 @@ struct qib_devdata *qib_init_iba7322_funcs(struct pci_dev *pdev,
>  		actual_cnt -= dd->num_pports;
>  
>  	tabsize = actual_cnt;
> -	dd->cspec->msix_entries = kzalloc(tabsize *
> -			sizeof(struct qib_msix_entry), GFP_KERNEL);
> +	dd->cspec->msix_entries = kcalloc(tabsize,
> +					  sizeof(*dd->cspec->msix_entries),
> +					  GFP_KERNEL);

Are we fine with loosing the zeroing of the entries?

>  	if (!dd->cspec->msix_entries)
>  		tabsize = 0;
>  
> -- 
> 2.12.2
> 
> --
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