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

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Message-ID: <CADDKRnD-ixyLBuUGp3i9Ea5zkPgNa2Lh+jzCo9sKHbE=exLskw@mail.gmail.com>
Date:	Wed, 11 Mar 2015 12:01:10 +0100
From:	Jörg Otte <jrg.otte@...il.com>
To:	Mathias Nyman <mathias.nyman@...ux.intel.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

2015-03-10 18:04 GMT+01:00 Mathias Nyman <mathias.nyman@...ux.intel.com>:
> 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

Problems:
error: patch failed: drivers/usb/host/xhci.c:2972
error: drivers/usb/host/xhci.c: patch does not apply

For me the patch looks formally good.
No idea why.

Thanks, Jörg
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