netdev - Re: [PATCH] sysfs: Don't allow the creation of symlinks we can't remove

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Date:	Thu, 8 Jul 2010 16:06:01 -0700
From:	Greg KH <greg@...ah.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Greg KH <gregkh@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	"Maciej W. Rozycki" <macro@...ux-mips.org>,
	Kay Sievers <kay.sievers@...y.org>,
	Johannes Berg <johannes@...solutions.net>,
	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH] sysfs: Don't allow the creation of symlinks we can't
 remove

On Thu, Jul 08, 2010 at 03:28:53PM -0700, Eric W. Biederman wrote:
> Greg KH <greg@...ah.com> writes:
> 
> > With this patch, how does the existing code fail as the drivers aren't
> > fixed up?
> >
> > I like this change, just worried it will cause problems if it gets into
> > .35, without your RFC patch.  Will it?
> 
> It don't expect this patch to be worse than where we are current at.
> Network devices are renamed, and come and go enough that both the
> mac80211_hwsim and the bnep driver are currently unusable with a
> failure only the rename and remove.
> 
> This patch simply moves the failure into creation where we are a little more
> prepared to deal with problems, and this patch is limited to mac80211_hwsim,
> bnep, and any hypothetically undiscovered other network devices that
> have the same problem.
> 
> mac80211_hwsim with just this patch becomes somewhat usable as it's primary
> network device gets registered and the module can be loaded and unloaded.  It
> just doesn't create the wlan0 and wlan1 interfaces for the wifi interfaces.

Fair enough, I've commited it now, let's see what happens :)

> On a slightly unrelated note, what got us on trying to convert
> mac80211_hwsim was that everything happens in a single module which
> makes avoiding cleanup races hard.  I am hoping bnep is structured
> enough differently so we can convert it to a bus device using the
> existing infrastructure.  I haven't figured out bnep yet though ;(

Yeah, good luck with that...

greg k-h
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