linux-kernel - Re: ohci1394 regression in 2.6.19-rc1 (was Re: Merge window closed: v2.6.19-rc1)

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Message-Id: <200610052130.28610.s0348365@sms.ed.ac.uk>
Date:	Thu, 5 Oct 2006 21:30:28 +0100
From:	Alistair John Strachan <s0348365@....ed.ac.uk>
To:	Stefan Richter <stefanr@...6.in-berlin.de>
Cc:	Linus Torvalds <torvalds@...l.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	bcollins@...ian.org, linux1394-devel@...ts.sourceforge.net
Subject: Re: ohci1394 regression in 2.6.19-rc1 (was Re: Merge window closed: v2.6.19-rc1)

On Thursday 05 October 2006 19:56, Stefan Richter wrote:
> Alistair John Strachan wrote:
> > Booted fine here, but I've got a few strange messages from the firewire
> > subsystem that weren't present in 2.6.18. I think it marginally slows
> > down boot up, but I could just be imagining it.
> >
> > [alistair] 16:04 [~] dmesg | grep 1394
> > ohci1394: fw-host0: OHCI-1394 1.1 (PCI): IRQ=[19] 
> > MMIO=[dffff000-dffff7ff]  Max Packet=[2048]  IR/IT contexts=[4/8]
> > ohci1394: fw-host1: OHCI-1394 1.1 (PCI): IRQ=[17] 
> > MMIO=[dfffc000-dfffc7ff]  Max Packet=[2048]  IR/IT contexts=[4/8]
> > ohci1394: fw-host0: Running dma failed because Node ID is not valid
> > ohci1394: fw-host0: AT dma reset ctx=0, aborting transmission
> > ieee1394: Current remote IRM is not 1394a-2000 compliant, resetting...
> > ieee1394: Host added: ID:BUS[0-00:1023]  GUID[00023c0091023fd7]
> > ieee1394: Host added: ID:BUS[1-00:1023]  GUID[000129200003d023]
>
> Thanks for the quick report. Could you please test the following, each
> one separately?
>
> A. Configure PCI_MULTITHREAD_PROBE=n

Not set.

> B. Revert patch "Initialize ieee1394 early when built in"
> http://www.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=comm
>itdiff_plain;h=8df4083c5291b3647e0381d3c69ab2196f5dd3b7

Firewire isn't built in. I assume therefore this would have no effect.

> I don't see how any other ohci1394 patch after 2.6.18 could lead up to
> that message. I also don't understand what causes this glitch. At least
> it seems recoverable, according to the "Host added" lines.

I haven't tried to use it, but I agree that the outcome is similar. I 
recompiled with excessive debug output on 2.6.19-rc1, and uploaded the 
configs for 2.6.19-rc1 and 2.6.18, and the corresponding dmesg outputs. As 
you can see, 2.6.18 does not exhibit any problems.

-- 
Cheers,
Alistair.

Final year Computer Science undergraduate.
1F2 55 South Clerk Street, Edinburgh, UK.
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