linux-kernel - Re: [Bug #10713] ehci splatter in 2.6.26-rc2

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Message-Id: <200805192313.11600.david-b@pacbell.net>
Date:	Mon, 19 May 2008 23:13:11 -0700
From:	David Brownell <david-b@...bell.net>
To:	Lennert Buytenhek <buytenh@...tstofly.org>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Alan Stern <stern@...land.harvard.edu>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	akpm@...ux-foundation.org, nico@....org
Subject: Re: [Bug #10713] ehci splatter in 2.6.26-rc2

On Monday 19 May 2008, Lennert Buytenhek wrote:
> A bisect turns up this:
> 
>         7329e211b987a493cbcfca0e98c60eb108ab42df is first bad commit
>         commit 7329e211b987a493cbcfca0e98c60eb108ab42df
>         Author: Alan Stern <stern@...land.harvard.edu>
>         Date:   Thu Apr 3 18:02:56 2008 -0400
> 
>             USB: root hubs don't lie about their number of TTs
>             
>             Currently EHCI root hubs enumerate with a bDeviceProtocol code
>             indicating that they possess a Transaction Translator.  However the
>             vast majority of controllers do not...
> 
> And indeed, reverting this commit from 2.6.26-rc3 makes my system
> stop oopsing when I plug in the USB-PS/2 adapter (a low speed device),
> and makes it work again as it did in 2.6.25.
> 
> Any other info I can provide or tests I can run?

I'm guessing that this has a version of the ARC/TDI/whoever-now-owns-it
IP, on a PCI bus?  But without the integrated TT option?

If this is on a PCI bus, then try removing the ehci-pci.c line added
by that patch, see if that helps.

- Dave

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