netdev - Re: [PATCH 2.6.20] kobject net ifindex + rename

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Date:	Wed, 28 Feb 2007 10:45:41 -0800
From:	Jean Tourrilhes <jt@....hp.com>
To:	Jarek Poplawski <jarkao2@...pl>
Cc:	Greg Kroah-Hartman <gregkh@...e.de>,
	"David S. Miller" <davem@...emloft.net>,
	Linux kernel mailing list <linux-kernel@...r.kernel.org>,
	netdev@...r.kernel.org
Subject: Re: [PATCH 2.6.20] kobject net ifindex + rename

On Wed, Feb 28, 2007 at 10:34:37AM +0100, Jarek Poplawski wrote:
> On 28-02-2007 02:27, Jean Tourrilhes wrote:
> > 	Hi all,
> ...
> > 	Patch for 2.6.20 is attached. The patch was tested on a system
> > running the hotplug scripts, and on another system running udev.
> > 
> > 	Have fun...
> > 
> > 	Jean
> > 
> > Signed-off-by: Jean Tourrilhes <jt@....hp.com>
> > 
> > ---------------------------------------------------------
> ...
> > diff -u -p linux/net/core/net-sysfs.j1.c linux/net/core/net-sysfs.c
> > --- linux/net/core/net-sysfs.j1.c	2007-02-27 15:01:08.000000000 -0800
> > +++ linux/net/core/net-sysfs.c	2007-02-27 15:06:49.000000000 -0800
> > @@ -412,6 +412,17 @@ static int netdev_uevent(struct class_de
> >  	if ((size <= 0) || (i >= num_envp))
> >  		return -ENOMEM;
> >  
> > +	/* pass ifindex to uevent.
> > +	 * ifindex is useful as it won't change (interface name may change)
> > +	 * and is what RtNetlink uses natively. */
> > +	envp[i++] = buf;
> > +	n = snprintf(buf, size, "IFINDEX=%d", dev->ifindex) + 1;
> > +	buf += n;
> > +	size -= n;
> > +
> > +	if ((size <= 0) || (i >= num_envp))
> 
> Btw.:
> 1. if size == 10 and snprintf returns 9 (without NULL)
>    then n == 10 (with NULL), so isn't it enough (here and above):
>  
> 	if ((size < 0) || (i >= num_envp))

	I just cut'n'pasted the code a few line above. If the original
code is incorrect, it need fixing. And it will need fixing in probably
a lot of places.

> 2. shouldn't there be (here and above):
>  
> 		envp[--i] = NULL;
> 

	No, envp is local, so who cares.
	Thanks.

	Jean
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