linux-kernel - Re: [V4.0.0-rc3] Xhci Regression: ERROR Transfer event TRB DMA ptr not part of current TD

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Date:	Tue, 10 Mar 2015 19:04:03 +0200
From:	Mathias Nyman <mathias.nyman@...ux.intel.com>
To:	Jörg Otte <jrg.otte@...il.com>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	USB list <linux-usb@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>
Subject: Re: [V4.0.0-rc3] Xhci Regression: ERROR Transfer event TRB DMA ptr
 not part of current TD

On 10.03.2015 17:36, Jörg Otte wrote:

>>> Any chance you could take a log with xhci debugging enabled before attaching the DVB-T
>>> stick?
>>>
>>> echo -n 'module xhci_hcd =p' > /sys/kernel/debug/dynamic_debug/control
>>>
>>>
>>
>> here it comes attached.
>>
>>
>>> I'd suspect one of these two patches:
>>>
>>> commit 45ba2154d12fc43b70312198ec47085f10be801a
>>>     xhci: fix reporting of 0-sized URBs in control endpoint
>>>
>>> commit 27082e2654dc148078b0abdfc3c8e5ccbde0ebfa
>>>     xhci: Clear the host side toggle manually when endpoint is 'soft reset'
>>>
> 
> Revert the commits.
> The second one  "xhci: Clear the host side..."  is it !
> 

Yes, thank you

Seems that It wasn't mature enough, I'll revert it.

>From your logs I can see what went wrong, 

If you still have some time, could you try out a patch (attached) and see if it solves the
issue for you. (on top of clean 4.0-rc3). I can't reproduce it with my own USB DVB-T device

-Mathias 


View attachment "0001-xhci-set-correct-dequeue-status-in-endpoint-soft-res.patch" of type "text/x-patch" (1494 bytes)