linux-kernel - Re: [PATCH 13/37] drivers/net/wireless/iwmc3200wifi: Use kmemdup

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Message-ID: <20100516230135.GA3112@sortiz.org>
Date:	Mon, 17 May 2010 01:01:36 +0200
From:	Samuel Ortiz <samuel.ortiz@...el.com>
To:	Julia Lawall <julia@...u.dk>
Cc:	"Zhu, Yi" <yi.zhu@...el.com>,
	Intel Linux Wireless <ilw@...ux.intel.com>,
	"John W. Linville" <linville@...driver.com>,
	"linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>
Subject: Re: [PATCH 13/37] drivers/net/wireless/iwmc3200wifi: Use kmemdup

On Sat, May 15, 2010 at 10:16:58PM +0100, Julia Lawall wrote:
> From: Julia Lawall <julia@...u.dk>
> 
> Use kmemdup when some other buffer is immediately copied into the
> allocated region.
> 
> A simplified version of the semantic patch that makes this change is as
> follows: (http://coccinelle.lip6.fr/)
> 
> // <smpl>
> @@
> expression from,to,size,flag;
> statement S;
> @@
> 
> -  to = \(kmalloc\|kzalloc\)(size,flag);
> +  to = kmemdup(from,size,flag);
>    if (to==NULL || ...) S
> -  memcpy(to, from, size);
> // </smpl>
> 
> Signed-off-by: Julia Lawall <julia@...u.dk>
Acked-by: Samuel Ortiz <sameo@...ux.intel.com>

Cheers,
Samuel.
 
> ---
>  drivers/net/wireless/iwmc3200wifi/rx.c |    4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff -u -p a/drivers/net/wireless/iwmc3200wifi/rx.c b/drivers/net/wireless/iwmc3200wifi/rx.c
> --- a/drivers/net/wireless/iwmc3200wifi/rx.c
> +++ b/drivers/net/wireless/iwmc3200wifi/rx.c
> @@ -321,14 +321,14 @@ iwm_rx_ticket_node_alloc(struct iwm_priv
>  		return ERR_PTR(-ENOMEM);
>  	}
>  
> -	ticket_node->ticket = kzalloc(sizeof(struct iwm_rx_ticket), GFP_KERNEL);
> +	ticket_node->ticket = kmemdup(ticket, sizeof(struct iwm_rx_ticket),
> +				      GFP_KERNEL);
>  	if (!ticket_node->ticket) {
>  		IWM_ERR(iwm, "Couldn't allocate RX ticket\n");
>  		kfree(ticket_node);
>  		return ERR_PTR(-ENOMEM);
>  	}
>  
> -	memcpy(ticket_node->ticket, ticket, sizeof(struct iwm_rx_ticket));
>  	INIT_LIST_HEAD(&ticket_node->node);
>  
>  	return ticket_node;

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