linux-kernel - Re: [PATCH 19/37] drivers/net/usb: Use kmemdup

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Message-ID: <alpine.DEB.2.00.1005191106430.3093@bender.nucleusys.com>
Date:	Wed, 19 May 2010 11:07:50 +0300 (EEST)
From:	Petko Manolov <petkan@...leusys.com>
To:	Julia Lawall <julia@...u.dk>
cc:	Petko Manolov <petkan@...rs.sourceforge.net>,
	Greg Kroah-Hartman <gregkh@...e.de>, linux-usb@...r.kernel.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 19/37] drivers/net/usb: Use kmemdup

Looks all right to me.


 		Petko


On Sat, 15 May 2010, 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>
>
> ---
> drivers/net/usb/pegasus.c |    6 ++----
> 1 file changed, 2 insertions(+), 4 deletions(-)
>
> diff -u -p a/drivers/net/usb/pegasus.c b/drivers/net/usb/pegasus.c
> --- a/drivers/net/usb/pegasus.c
> +++ b/drivers/net/usb/pegasus.c
> @@ -203,13 +203,12 @@ static int set_registers(pegasus_t * peg
> 	char *buffer;
> 	DECLARE_WAITQUEUE(wait, current);
>
> -	buffer = kmalloc(size, GFP_KERNEL);
> +	buffer = kmemdup(data, size, GFP_KERNEL);
> 	if (!buffer) {
> 		netif_warn(pegasus, drv, pegasus->net,
> 			   "out of memory in %s\n", __func__);
> 		return -ENOMEM;
> 	}
> -	memcpy(buffer, data, size);
>
> 	add_wait_queue(&pegasus->ctrl_wait, &wait);
> 	set_current_state(TASK_UNINTERRUPTIBLE);
> @@ -255,13 +254,12 @@ static int set_register(pegasus_t * pega
> 	char *tmp;
> 	DECLARE_WAITQUEUE(wait, current);
>
> -	tmp = kmalloc(1, GFP_KERNEL);
> +	tmp = kmemdup(&data, 1, GFP_KERNEL);
> 	if (!tmp) {
> 		netif_warn(pegasus, drv, pegasus->net,
> 			   "out of memory in %s\n", __func__);
> 		return -ENOMEM;
> 	}
> -	memcpy(tmp, &data, 1);
> 	add_wait_queue(&pegasus->ctrl_wait, &wait);
> 	set_current_state(TASK_UNINTERRUPTIBLE);
> 	while (pegasus->flags & ETH_REGS_CHANGED)
>
--
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