linux-kernel - Re: [BUG] PCI related panic on powerpc based board with 3.10-rcX

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Date:	Mon, 10 Jun 2013 17:52:33 -0500
From:	Scott Wood <scottwood@...escale.com>
To:	Michael Guntsche <michael.guntsche@...loops.com>
CC:	Rojhalat Ibrahim <imr@...chenk.de>,
	<linuxppc-dev@...ts.ozlabs.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [BUG] PCI related panic on powerpc based board with 3.10-rcX

On 06/10/2013 12:07:43 PM, Michael Guntsche wrote:
> Good evening,
> 
> On Mon, Jun 10, 2013 at 1:41 PM, Rojhalat Ibrahim <imr@...chenk.de>  
> wrote:
> > Hi Mike,
> >
> > could you please try this patch:
> > https://lists.ozlabs.org/pipermail/linuxppc-dev/2013-May/106624.html
> > http://patchwork.ozlabs.org/patch/244515/
> >
> >    Rojhalat
> >
> >
> > On Saturday 08 June 2013 21:39:37 Michael Guntsche wrote:
> >> After bisecting I found the responsible commit.
> >>
> >> 50d8f87d2b3: powerpc/fsl-pci Make PCIe hotplug work with Freescale
> >> PCIe controllers
> >>
> >> Reverting this commit allowed my board to boot again.
> >>
> >> @Rojhalat: Please have a look at
> >> http://marc.info/?l=linux-kernel&m=137071294204858&w=2
> >> for my initial bugreport.
> >>
> >> What I do not understand at all is why this is affecting my  
> platform.
> >> AFAIK there is no PCIe hardware on it AND I completely disabled  
> PCIe
> >> support in config.
> >>
> >> Kind regards,
> >> Mike
> 
> This patch does not fix the problem, during boot the kernel still
> panics. I had a closer look at the commit and the following patch
> fixes it for me....
> 
> diff --git a/arch/powerpc/sysdev/fsl_pci.c  
> b/arch/powerpc/sysdev/fsl_pci.c
> index 028ac1f..21b687f 100644
> --- a/arch/powerpc/sysdev/fsl_pci.c
> +++ b/arch/powerpc/sysdev/fsl_pci.c
> @@ -814,7 +814,7 @@ int __init mpc83xx_add_bridge(struct device_node  
> *dev)
>                 if (ret)
>                         goto err0;
>         } else {
> -               fsl_setup_indirect_pci(hose, rsrc_cfg.start,
> +               setup_indirect_pci(hose, rsrc_cfg.start,
>                                        rsrc_cfg.start + 4, 0);
>         }

The only difference here is that you're not setting hose->ops to  
fsl_indirect_pci_ops.  Do you know why that is helping, and what  
hose->ops is set to instead?

-Scott
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