[PATCH] powerpc: fix pci domain detection

[Benjamin Herrenschmidt]

On Wed, 2007-09-26 at 16:02 +0200, Arnd Bergmann wrote:
> The /proc/bus/pci/* files list PCI domain numbers only for
> devices that claim to be on a multi-domain system. The check
> for this is broken on powerpc, because the buid value is
> truncated to 32 bits.
> 
> There is at least one machine (IBM QS21) that only uses
> the high-order bits of the buid, so the return value
> of pci_proc_domain() ends up being always zero, which
> makes /proc/bus/pci useless.
> 
> Change the logic to always return '1' for a nonzero
> buid value.
> 
> Signed-off-by: Arnd Bergmann <arnd.bergmann at de.ibm.com>

Good catch !

Acked-by: Benjamin Herrenschmidt <benh at kernel.crashing.org>

> 
> diff --git a/arch/powerpc/kernel/pci_64.c b/arch/powerpc/kernel/pci_64.c
> index 291ffbc..9f63bdc 100644
> --- a/arch/powerpc/kernel/pci_64.c
> +++ b/arch/powerpc/kernel/pci_64.c
> @@ -588,7 +588,7 @@ int pci_proc_domain(struct pci_bus *bus)
>  		return 0;
>  	else {
>  		struct pci_controller *hose = pci_bus_to_host(bus);
> -		return hose->buid;
> +		return hose->buid != 0;
>  	}
>  }
>  
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