linux-kernel - Re: [PATCH] ARM/PCI: set MPS before pci_bus_add

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Message-ID: <20150723145936.GX21967@google.com>
Date:	Thu, 23 Jul 2015 09:59:36 -0500
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Murali Karicheri <m-karicheri2@...com>
Cc:	linux@....linux.org.uk, linux-pci@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM/PCI: set MPS before pci_bus_add_devices()

On Tue, Jul 21, 2015 at 05:35:19PM -0400, Murali Karicheri wrote:
> The MPS configuration should be done *before* pci_bus_add_devices().
> After pci_bus_add_devices(), drivers may be bound to devices, and
> the PCI core shouldn't touch device configuration while a driver
> owns the device.
> 
> Signed-off-by: Murali Karicheri <m-karicheri2@...com>
> Reported-by: Bjorn Helgaas <bhelgaas@...gle.com>

Applied to pci/enumeration for v4.3, thanks!  I removed the "bus" test; let
me know if you think that's incorrect.

> ---
>  arch/arm/kernel/bios32.c | 19 +++++--------------
>  1 file changed, 5 insertions(+), 14 deletions(-)
> 
> diff --git a/arch/arm/kernel/bios32.c b/arch/arm/kernel/bios32.c
> index fcbbbb1..17efde7 100644
> --- a/arch/arm/kernel/bios32.c
> +++ b/arch/arm/kernel/bios32.c
> @@ -520,7 +520,8 @@ void pci_common_init_dev(struct device *parent, struct hw_pci *hw)
>  	list_for_each_entry(sys, &head, node) {
>  		struct pci_bus *bus = sys->bus;
>  
> -		if (!pci_has_flag(PCI_PROBE_ONLY)) {
> +		if (bus && !pci_has_flag(PCI_PROBE_ONLY)) {

I think the test for "bus" being non-NULL is superfluous here.  If "bus"
were NULL, we would already oops in pci_bus_add_devices().

> +			struct pci_bus *child;
>  			/*
>  			 * Size the bridge windows.
>  			 */
> @@ -530,25 +531,15 @@ void pci_common_init_dev(struct device *parent, struct hw_pci *hw)
>  			 * Assign resources.
>  			 */
>  			pci_bus_assign_resources(bus);
> -		}
>  
> +			list_for_each_entry(child, &bus->children, node)
> +				pcie_bus_configure_settings(child);
> +		}
>  		/*
>  		 * Tell drivers about devices found.
>  		 */
>  		pci_bus_add_devices(bus);
>  	}
> -
> -	list_for_each_entry(sys, &head, node) {
> -		struct pci_bus *bus = sys->bus;
> -
> -		/* Configure PCI Express settings */
> -		if (bus && !pci_has_flag(PCI_PROBE_ONLY)) {
> -			struct pci_bus *child;
> -
> -			list_for_each_entry(child, &bus->children, node)
> -				pcie_bus_configure_settings(child);
> -		}
> -	}
>  }
>  
>  #ifndef CONFIG_PCI_HOST_ITE8152
> -- 
> 1.9.1
> 
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