linux-kernel - Re: [RFC PATCH 1/3] MIPS: PCI: Use pci_bus_remove_resources()/pci_bus_add

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Message-ID: <CAErSpo4U6orULckFofbJON+x70m1G4w76rK4Y1Besh_K-m612g@mail.gmail.com>
Date:	Thu, 25 Aug 2011 17:23:24 -0600
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Deng-Cheng Zhu <dengcheng.zhu@...il.com>
Cc:	jbarnes@...tuousgeek.org, ralf@...ux-mips.org,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mips@...ux-mips.org, eyal@...s.com, zenon@...s.com
Subject: Re: [RFC PATCH 1/3] MIPS: PCI: Use pci_bus_remove_resources()/pci_bus_add_resource()
 to set up root resources

On Thu, Aug 25, 2011 at 5:14 PM, Deng-Cheng Zhu <dengcheng.zhu@...il.com> wrote:
> 2011/8/25 Bjorn Helgaas <bhelgaas@...gle.com>:
>> No, I just mean that I don't see why you need this patch at all.  If
>> you pass the list of bus resources to pci_create_bus(), there's no
>> need to fix anything up later.  Or am I missing something?
>
> Well, doing the root resource fixups in here is a *paranoid* way. It's to
> deal with the 'unlikely' circumstance where controller_resources() returns
> the NULL pointer in pcibios_scanbus() due to memory allocation failure.
> Most of the time (always) it's nothing more than repeating the resource
> list setup. But maybe we can do something like this:
>
> if (unlikely(!dev && list_empty(&bus->resources))
>        pcibios_setup_root_resources(bus, hose);
>
>
> What do you think?

I don't think it's worth it.  Just check for failure of
controller_resources(), and if it fails, skip the pci_create_bus()
call.  You've already printed a message (you might add the PCI
domain/bus number).

Bjorn
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