linux-kernel - Re: USB/DVB - Old Technotrend TT-connect S-2400 regression tracked down

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Message-ID: <4A1A5E24.20201@unsolicited.net>
Date:	Mon, 25 May 2009 10:00:20 +0100
From:	David <david@...olicited.net>
To:	Pete Zaitcev <zaitcev@...hat.com>
CC:	Alan Stern <stern@...land.harvard.edu>,
	USB list <linux-usb@...r.kernel.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	linux-media@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	dbrownell@...rs.sourceforge.net, leonidv11@...il.com,
	Greg KH <gregkh@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: USB/DVB - Old Technotrend TT-connect S-2400 regression tracked
 down

Pete Zaitcev wrote:
> On Sun, 24 May 2009 22:10:50 -0400 (EDT), Alan Stern <stern@...land.harvard.edu> wrote:
>
>   
>> Pete, you should look at this.  It appears to be a problem with the DMA
>> mapping in usbmon.  Probably the same sort of thing you were working on
>> about a week ago (trying to access device memory).
>>     
>
> Indeed it looks the same. Is this an AMD CPU?
>   
yes, a Phenom.

> I wonder if CONFIG_HAVE_DMA_API_DEBUG does it (enabled with a select
> in arch/x86/Kconfig). Strange that it started happening now.
>   
That is enabled. I'll switch it off and give it another go.

David
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