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Date: Tue, 10 Mar 2015 15:06:26 +0200
From: Mathias Nyman <mathias.nyman@linux.intel.com>
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To: =?UTF-8?B?SsO2cmcgT3R0ZQ==?= <jrg.otte@gmail.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        USB list <linux-usb@vger.kernel.org>
CC: Linus Torvalds <torvalds@linux-foundation.org>,
        Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Subject: Re: [V4.0.0-rc3] Xhci Regression: ERROR Transfer event TRB DMA ptr
 not part of current TD
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On 10.03.2015 11:40, Jörg Otte wrote:
> If I plug in my USB DVB-T stick I get the following in dmesg:
> 
> dvb-usb: found a 'TerraTec/qanu USB2.0 Highspeed DVB-T Receiver' in warm state.
> dvb-usb: will pass the complete MPEG2 transport stream to the software demuxer.
> DVB: registering new adapter (TerraTec/qanu USB2.0 Highspeed DVB-T Receiver)
> usb 1-1: DVB: registering adapter 0 frontend 0 (TerraTec/qanu USB2.0
> Highspeed DVB-T Receiver)...
> input: IR-receiver inside an USB DVB receiver as
> /devices/pci0000:00/0000:00:14.0/usb1/1-1/input/input17
> dvb-usb: schedule remote query interval to 50 msecs.
> xhci_hcd 0000:00:14.0: ERROR Transfer event TRB DMA ptr not part of
> current TD ep_index 1 comp_code 1
> xhci_hcd 0000:00:14.0: Looking for event-dma 0000000207540400
> trb-start 0000000207540420 trb-end 0000000207540420 seg-start
> 00000002075404
> xhci_hcd 0000:00:14.0: ERROR Transfer event TRB DMA ptr not part of
> current TD ep_index 1 comp_code 1
> xhci_hcd 0000:00:14.0: Looking for event-dma 0000000207540410
> trb-start 0000000207540420 trb-end 0000000207540420 seg-start
> 00000002075404
> dvb-usb: bulk message failed: -110 (2/0)
> 
> and DVB-T is not functional. The problem came in with:
> 
> 1163d50 Merge tag 'usb-4.0-rc3' of
> git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb
> 
> I never had this xhci_hcd error before so this is a regression.
> 
> 
> Thanks, Jörg

Oh, thanks.

Looks like we get an event for a TRB we just moved past. 

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


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'

-Mathias