linux-kernel - Re: 3.0-rc6: USB khubd deadlock when hub is powered down

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Date:	Thu, 7 Jul 2011 13:42:03 -0700
From:	Sarah Sharp <sarah.a.sharp@...ux.intel.com>
To:	Stefan Richter <stefanr@...6.in-berlin.de>
Cc:	Greg KH <greg@...ah.com>, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Alan Stern <stern@...land.harvard.edu>
Subject: Re: 3.0-rc6: USB khubd deadlock when hub is powered down

On Thu, Jul 07, 2011 at 09:24:49PM +0200, Stefan Richter wrote:
> On Jul 07 Greg KH wrote:
> > Can you test Linus's tree, along with a patch sent yesterday from Alan
> > Stern to the linux-usb mailing list (attached below)?  That should
> > resolve this issue, if not, please let us know.
> 
> OK.  I am using 3.0-rc6-71-g4dd1b49 plus Alan's "USB: additional
> regression fix for device removal" now.  So far it survived a dozen of
> power toggles of the hub and the attached devices.  Thanks.
> 
> Alan Stern wrote:
> > Still, we need to rewrite this stuff.  A possible race remains,
> 
> On a general level, the last few kernel.org releases have all been rather
> weak.  Dissatisfied,

For USB regressions or the kernel overall?  Yes, last kernel release had
some nasty regressions-disguised-as-bug-fixes in the USB tree as well.
My fault there, not sure how to improve other than coming up with a list
of every possible plug-unplug/reset/configure/alt setting change
combination possible and testing before sending any thing at all.
Suggestions welcome, testing appreciated.

Sarah Sharp
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