linux-kernel - Re: [RFC 3/4] arm64: Do not call enable PCI resources when specify PCI_PROBE

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Date:	Wed, 24 Jun 2015 08:32:14 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	suravee.suthikulpanit@....com
Cc:	will.deacon@....com, liviu.dudau@....com, marc.zyngier@....com,
	mark.rutland@....com, catalin.marinas@....com,
	jason@...edaemon.net, tglx@...utronix.de, robh+dt@...nel.org,
	bhelgaas@...gle.com, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-doc@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [RFC 3/4] arm64: Do not call enable PCI resources when specify
 PCI_PROBE_ONLY

On Sun, 2014-09-28 at 15:53 -0500, suravee.suthikulpanit@....com wrote:
> From: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
> 
> When specify PCI_PROBE_ONLY, the resource parent does not get assigned.
> Therefore, pci_enable_resources() return error saying that
> "BAR x not claimed".
> 
> Note: This same logic is also used in the arch/arm/kernel/bios32.c

This looks broken. Why don't you assign the resource parent ?

> Cc: Liviu Dudau <Liviu.Dudau@....com>
> Cc: Bjorn Helgaas <bhelgaas@...gle.com>
> Cc: Will Deacon <will.deacon@....com>
> Cc: Catalin Marinas <catalin.marinas@....com>
> Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
> ---
>  arch/arm64/kernel/pci.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/arch/arm64/kernel/pci.c b/arch/arm64/kernel/pci.c
> index ce5836c..7fd4d2b 100644
> --- a/arch/arm64/kernel/pci.c
> +++ b/arch/arm64/kernel/pci.c
> @@ -68,3 +68,11 @@ void pci_bus_assign_domain_nr(struct pci_bus *bus, struct device *parent)
>  	bus->domain_nr = domain;
>  }
>  #endif
> +
> +int pcibios_enable_device(struct pci_dev *dev, int mask)
> +{
> +	if (pci_has_flag(PCI_PROBE_ONLY))
> +		return 0;
> +
> +	return pci_enable_resources(dev, mask);
> +}


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