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

On Thursday 13 June 2013 11:49:17 Scott Wood wrote:

On 06/13/2013 02:21:24 AM, Rojhalat Ibrahim wrote:

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On Wednesday 12 June 2013 16:50:26 Scott Wood wrote:

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On 06/12/2013 03:19:30 AM, Rojhalat Ibrahim wrote:

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On Tuesday 11 June 2013 12:28:59 Scott Wood wrote:

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Yes, I figured it was non-PCIe because the code change that you

said

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helped was on the non-PCIe branch of the if/else.  Generally

it's

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good

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to explicitly mention the chip you're using, though.

fsl_setup_indirect_pci should be renamed to

fsl_setup_indirect_pcie.

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Your patch above should be applied, and fsl_setup_indirect_pcie

should

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be moved into the booke/86xx ifdef to avoid an unused function

warning.

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-Scott

How about this patch? It uses setup_indirect_pci for the PCI case

in

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mpc83xx_add_bridge. Additionally it adds a check in
fsl_setup_indirect_pci
to only use the modified read function in case of PCIe.

If we're adding the check to fsl_setup_indirect_pci, there's no

need to

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change the 83xx call back to setup_indirect_pci.  I see that 85xx is
also callirng fsl_setup_indirect_pci for both; it'd be good to be
consistent.

In any case, can you send a proper patch with a signoff and commit
message?

-Scott

Where is it called for 85xx? As far as I can tell
fsl_setup_indirect_pci is
called exactly once in fsl_add_bridge and nowhere else (after
applying the
proposed patch).

fsl_add_bridge() is where it's called for 85xx.

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For 83xx the decision between PCI and PCIe has already been made at
the point where the setup function is called. So IMO it doesn't make
sense
to call fsl_setup_indirect_pci and do the check again. Moreover PCIe
on 83xx
uses a completely different set of functions.

My concern is consistency.  E.g. if 85xx is using
fsl_setup_indirect_pci for both, but 83xx isn't, then a developer using
83xx could end up breaking 85xx by introducing another PCIe dependency
in fsl_setup_indirect_pci.  Or an 85xx developer could put something
non-PCIe-related in fsl_setup_indirect_pci that 83xx would benefit from.

Alternatively, you could call it fsl_setup_indirect_pcie, and move the
PCIe check into fsl_add_bridge().

-Scott

Ok. I'll post a v2 of the patch.

   Rojhalat