linux-kernel - Re: Race free attributes in sysfs

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Message-ID: <20070523042145.GA27329@kroah.com>
Date:	Tue, 22 May 2007 21:21:45 -0700
From:	Greg KH <greg@...ah.com>
To:	Dmitry Torokhov <dtor@...ightbb.com>
Cc:	Mark Lord <lkml@....ca>, Pierre Ossman <drzeus-list@...eus.cx>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Race free attributes in sysfs

On Tue, May 22, 2007 at 10:43:55PM -0400, Dmitry Torokhov wrote:
> On Tuesday 22 May 2007 17:24, Mark Lord wrote:
> > Dmitry Torokhov wrote:
> > > 1. dev->uevent_suppress = 1;
> > > 2. device_register(dev);
> > > 3. device_create_file(dev, ...);
> > > 4. dev->uevent_suppress = 0;
> > > 5. kobject_uevent(&dev->kobj, KOBJ_ADD);
> > 
> > I don't see how that prevents an already-running udevd
> > from seeing the partially filled in /sys/ entry,
> > if it were.. say.. already doing a /sys scan,
> > or even just during initial startup.
> 
> I tought udev relies on uevents and does not hunt through sysfs on
> its own...

Actually, udev can run without sysfs at all these days :)

And yes, it only starts to look for things when it recieves an event, it
does not "scan" sysfs at all.

thanks,

greg k-h
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