linux-kernel - Re: [REVERT][v3.x.y] EHCI: Update qTD next pointer in QH overlay region during unlink

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Message-ID: <Pine.LNX.4.44L0.1301171353330.1339-100000@iolanthe.rowland.org>
Date:	Thu, 17 Jan 2013 13:56:39 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Joseph Salisbury <joseph.salisbury@...onical.com>
cc:	Ben Hutchings <ben@...adent.org.uk>,
	LKML <linux-kernel@...r.kernel.org>, <pkondeti@...eaurora.org>,
	Greg KH <gregkh@...uxfoundation.org>,
	Herton Krzesinski <herton.krzesinski@...onical.com>,
	<stable@...r.kernel.org>, <linux-usb@...r.kernel.org>
Subject: Re: [REVERT][v3.x.y] EHCI: Update qTD next pointer in QH overlay
 region during unlink

On Thu, 17 Jan 2013, Joseph Salisbury wrote:

> Hello,
> 
> Please consider reverting commit 
> 3d037774b42ed677f699b1dce7d548d55f4e4c2b in mainline as well as in the 
> current stable releases.  It was included upstream as of v3.6-rc6.  This 
> commit introduced a regression, described in the following bug report:
> 
> http://bugs.launchpad.net/bugs/1088733
> 
> Reverting commit 3d037774b42ed677f699b1dce7d548d55f4e4c2b in the v3.2 
> kernel has been confirmed to resolve the aforementioned bug.

I do not want to revert this commit without first understanding what is 
going wrong.  Please ask the reporter to post usbmon traces showing 
what happens in both a failed and a successful recording attempt.

Alan Stern

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