linux-kernel - Re: [PATCH 1/3] [media] au0828-video: Use kcalloc() in au0828_init

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Date:   Mon, 24 Oct 2016 23:28:44 +0100
From:   Andrey Utkin <andrey_utkin@...tmail.com>
To:     SF Markus Elfring <elfring@...rs.sourceforge.net>
Cc:     linux-media@...r.kernel.org, Hans Verkuil <hans.verkuil@...co.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rafael Lourenço de Lima Chehab 
        <chehabrafael@...il.com>, Shuah Khan <shuah@...nel.org>,
        Wolfram Sang <wsa-dev@...g-engineering.com>,
        LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 1/3] [media] au0828-video: Use kcalloc() in
 au0828_init_isoc()

On Mon, Oct 24, 2016 at 10:59:24PM +0200, SF Markus Elfring wrote:
> From: Markus Elfring <elfring@...rs.sourceforge.net>
> Date: Mon, 24 Oct 2016 22:08:47 +0200
> 
> * Multiplications for the size determination of memory allocations
>   indicated that array data structures should be processed.
>   Thus use the corresponding function "kcalloc".
> 
>   This issue was detected by using the Coccinelle software.
> 
> * Replace the specification of data types by pointer dereferences
>   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/media/usb/au0828/au0828-video.c | 11 +++++++----
>  1 file changed, 7 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/media/usb/au0828/au0828-video.c b/drivers/media/usb/au0828/au0828-video.c
> index 85dd9a8..85b13c1 100644
> --- a/drivers/media/usb/au0828/au0828-video.c
> +++ b/drivers/media/usb/au0828/au0828-video.c
> @@ -221,15 +221,18 @@ static int au0828_init_isoc(struct au0828_dev *dev, int max_packets,
>  
>  	dev->isoc_ctl.isoc_copy = isoc_copy;
>  	dev->isoc_ctl.num_bufs = num_bufs;
> -

> -	dev->isoc_ctl.urb = kzalloc(sizeof(void *)*num_bufs,  GFP_KERNEL);
> +	dev->isoc_ctl.urb = kcalloc(num_bufs,
> +				    sizeof(*dev->isoc_ctl.urb),
> +				    GFP_KERNEL);

What about this (for both hunks)?

-	dev->isoc_ctl.urb = kzalloc(sizeof(void *)*num_bufs,  GFP_KERNEL);
+	dev->isoc_ctl.urb =
+		kcalloc(num_bufs, sizeof(*dev->isoc_ctl.urb), GFP_KERNEL);