linux-kernel - Re: [PATCH] staging: rtl8712: consolidate kmalloc/memset 0 of array to kcalloc

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Date:	Mon, 04 Jan 2016 08:19:29 -0800
From:	Joe Perches <joe@...ches.com>
To:	Nicholas Mc Guire <hofrat@...dl.org>,
	Larry Finger <Larry.Finger@...inger.net>
Cc:	Florian Schilhabel <florian.c.schilhabel@...glemail.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Luis de Bethencourt <luisbg@....samsung.com>,
	Gamze POLAT <gamzepolat94@...il.com>,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: rtl8712: consolidate kmalloc/memset 0 of array
 to kcalloc

On Mon, 2016-01-04 at 10:05 +0100, Nicholas Mc Guire wrote:
> This is an API consolidation only. The use of kmalloc of an array
> of elements of equal size + memset to 0 of the same is equivalent to
> kcalloc.

Inequivalent code.

> Signed-off-by: Nicholas Mc Guire <hofrat@...dl.org>
> ---
> Found by coccinelle script (relaxed version of
> scripts/coccinelle/api/alloc/kzalloc-simple.cocci)
> 
> Patch was compile tested with: x86_64_defconfig +
> CONFIG_STAGING=y, CONFIG_R8712U=m
> 
> Patch is against linux-next (localversion-next is -next-20160104)
> 
>  drivers/staging/rtl8712/rtl871x_recv.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/drivers/staging/rtl8712/rtl871x_recv.c b/drivers/staging/rtl8712/rtl871x_recv.c
> index 4ff5301..aa841bf 100644
> --- a/drivers/staging/rtl8712/rtl871x_recv.c
> +++ b/drivers/staging/rtl8712/rtl871x_recv.c
> @@ -72,14 +72,12 @@ sint _r8712_init_recv_priv(struct recv_priv *precvpriv,
>  	_init_queue(&precvpriv->recv_pending_queue);
>  	precvpriv->adapter = padapter;
>  	precvpriv->free_recvframe_cnt = NR_RECVFRAME;
> -	precvpriv->pallocated_frame_buf = kmalloc(NR_RECVFRAME *
> +	precvpriv->pallocated_frame_buf = kcalloc(NR_RECVFRAME,
>  				sizeof(union recv_frame) + RXFRAME_ALIGN_SZ,

This allocates a different size now.

>  				GFP_ATOMIC);
>  	if (precvpriv->pallocated_frame_buf == NULL)
>  		return _FAIL;
>  	kmemleak_not_leak(precvpriv->pallocated_frame_buf);
> -	memset(precvpriv->pallocated_frame_buf, 0, NR_RECVFRAME *
> -		sizeof(union recv_frame) + RXFRAME_ALIGN_SZ);
>  	precvpriv->precv_frame_buf = precvpriv->pallocated_frame_buf +
>  				    RXFRAME_ALIGN_SZ -
>  				    ((addr_t)(precvpriv->pallocated_frame_buf) &

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