netdev - Re: [PATCH] netdevice zd1201: Convert directly reference of netdev->priv to netdev

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Message-ID: <490E5CA4.4010707@cn.fujitsu.com>
Date:	Mon, 03 Nov 2008 10:06:28 +0800
From:	Wang Chen <wangchen@...fujitsu.com>
To:	"John W. Linville" <linville@...driver.com>
CC:	linux-wireless@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Jeff Garzik <jgarzik@...ox.com>,
	NETDEV <netdev@...r.kernel.org>
Subject: Re: [PATCH] netdevice zd1201: Convert directly reference of netdev->priv
 to netdev_priv()

John W. Linville said the following on 2008-11-1 2:48:
> We have some reasons to kill netdev->priv:
> 1. netdev->priv is equal to netdev_priv().
> 2. netdev_priv() wraps the calculation of netdev->priv's offset, obviously
>    netdev_priv() is more flexible than netdev->priv.
> But we cann't kill netdev->priv, because so many drivers reference to it
> directly.
> 
> OK, becasue Dave S. Miller said, "every direct netdev->priv usage is a bug",
> and I want to kill netdev->priv later, I decided to convert all the direct
> reference of netdev->priv first.
> 
> (Original patch posted by Wang Chen <wangchen@...fujitsu.com> w/ above
> changelog but using dev->ml_priv.  That doesn't seem appropriate
> to me for this driver, so I've revamped it to use netdev_priv()
> instead. -- JWL)
> 
> Cc: Wang Chen <wangchen@...fujitsu.com>
> Signed-off-by: John W. Linville <linville@...driver.com>
> ---
>  drivers/net/wireless/zd1201.c |  115 ++++++++++++++++++++---------------------
>  1 files changed, 56 insertions(+), 59 deletions(-)
> 
snip...
> @@ -1731,6 +1731,7 @@ static int zd1201_probe(struct usb_interface *interface,
>  			const struct usb_device_id *id)
>  {
>  	struct zd1201 *zd;
> +	struct net_device *dev;
>  	struct usb_device *usb;
>  	int err;
>  	short porttype;
> @@ -1738,9 +1739,12 @@ static int zd1201_probe(struct usb_interface *interface,
>  
>  	usb = interface_to_usbdev(interface);
>  
> -	zd = kzalloc(sizeof(struct zd1201), GFP_KERNEL);
> -	if (!zd)
> +	dev = alloc_etherdev(sizeof(*zd));
> +	if (!dev)
>  		return -ENOMEM;
> +	zd = netdev_priv(dev);
> +	zd->dev = dev;
> +

It's ok to me.

Reviewed-by: Wang Chen <wangchen@...fujitsu.com>

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