linux-kernel - Re: [BUG] mm: bdi: export BDI attributes in sysfs

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Message-ID: <20080515204059.GA19417@kroah.com>
Date:	Thu, 15 May 2008 13:40:59 -0700
From:	Greg KH <greg@...ah.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Miklos Szeredi <miklos@...redi.hu>, ajones@...erbed.com,
	a.p.zijlstra@...llo.nl, mszeredi@...e.cz,
	akpm@...ux-foundation.org, kay.sievers@...y.org,
	trond.myklebust@....uio.no, linux-kernel@...r.kernel.org
Subject: Re: [BUG] mm: bdi: export BDI attributes in sysfs

On Thu, May 15, 2008 at 12:54:57PM -0700, Linus Torvalds wrote:
> 
> 
> On Thu, 15 May 2008, Miklos Szeredi wrote:
> > 
> > Actually nothing should need protection.  The only problem AFAICS is
> > that the device_create()/dev_set_drvdata() interface is racy: somebody
> > can come in after the device has been created but before drvdata has
> > been set, and then we are in trouble.
> 
> Well, I'm not sure that the locking should be at that level. Maybe the 
> locking *should* be in the driver that does this. It may need to do other 
> setup too, after all.
> 
> Of course, doing a device_create_drvdata() thing might be the right 
> solution, at least part of the time. Greg?

Yes, you are right, let me go knock that together...

thanks,

greg k-h
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