linux-kernel - Re: [PATCH] Driver core: fix race in __device_release

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Message-ID: <Pine.LNX.4.44L0.0711161548040.4691-100000@iolanthe.rowland.org>
Date:	Fri, 16 Nov 2007 15:48:43 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Greg KH <greg@...ah.com>
cc:	David Woodhouse <dwmw2@...radead.org>,
	USB development list <linux-usb-devel@...ts.sourceforge.net>,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Driver core: fix race in __device_release_driver

On Fri, 16 Nov 2007, Greg KH wrote:

> On Fri, Nov 16, 2007 at 11:57:28AM -0500, Alan Stern wrote:
> > This patch (as1013) was suggested by David Woodhouse; it fixes a race
> > in the driver core.  If a device is unregistered at the same time as
> > its driver is unloaded, the driver's code pages may be unmapped while
> > the remove method is still running.  The calls to get_driver() and
> > put_driver() were intended to prevent this, but they don't work if the
> > driver's module count has already dropped to 0.
> > 
> > Instead, the patch keeps the device on the driver's list until after
> > the remove method has returned.  This forces the necessary
> > synchronization to occur.
> 
> Is this something that you all feel is worth getting in for 2.6.24?
> Does it fix a regression that just showed up, or is just a bugfix for
> something that people finally realized has always been there?
> 
> Can it wait for 2.6.25 to get some more testing in -mm?

Considering how few people have been affected by it, I'm willing to 
let it wait for 2.6.25.  David Woodhouse may feel differently.

Alan Stern

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