linux-kernel - Re: USB Serial device disconnect causes IRQ disable after using ehci controller halted

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Message-Id: <200808271137.24557.david-b@pacbell.net>
Date:	Wed, 27 Aug 2008 11:37:23 -0700
From:	David Brownell <david-b@...bell.net>
To:	Greg KH <greg@...ah.com>
Cc:	amruth_pv@...oo.com, Alan Stern <stern@...land.harvard.edu>,
	Karsten Wiese <fzu@...gehoertderstaat.de>,
	Oliver Neukum <oliver@...kum.org>,
	USB list <linux-usb@...r.kernel.org>,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: USB Serial device disconnect causes IRQ disable after using ehci controller halted

On Wednesday 27 August 2008, Greg KH wrote:
> 
> > As noted by Stefan Neis <Stefan.Neis@...il.com>, we had a recent
> > regression with EHCI periodic transfers, in some (seemingly not
> > all that common) cases.
> > 
> > The root cause was that the schedule activation was only loosely
> > coupled to the addition or removal of transfers, so two different 
> > execution contexts could both think they had to deactivate (or
> > conversely activate) the schedule.  So this fix tightens that
> > coupling, managing it more like a refcount.
> > 
> > Signed-off-by: David Brownell <dbrownell@...rs.sourceforge.net>
> 
> Do you want me to also apply this one?  If so, for .27 or .28?

It should get into 2.6.27, and probably 26.stable ... assuming
that it checks out properly.  A somewhat cruftier version resolved
Stefan's problem, but I'd rather not merge that one.  Hmm, I'll
ask Stefan to confirm this version.

- Dave
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