Re: [PATCH 10/28] PCI: Save sysdata in pci_host_bridge drvdata

Yijing Wang
2015-01-19T03:12:50Z

On 2015/1/16 17:18, Arnd Bergmann wrote:
> On Friday 16 January 2015 09:44:08 Yijing Wang wrote:
>> @@ -2066,11 +2064,11 @@ struct pci_bus *pci_scan_root_bus(struct device *parent, u32 db,
>> {
>> struct pci_host_bridge *host;
>>
>> - host = pci_create_host_bridge(parent, db, resources);
>> + host = pci_create_host_bridge(parent, db, resources, sysdata);
>> if (!host)
>> return NULL;
>>
>> - return __pci_scan_root_bus(host, ops, sysdata);
>> + return __pci_scan_root_bus(host, ops);
>> }
>> EXPORT_SYMBOL(pci_scan_root_bus);
>>
>
> How about keeping the sysdata out of the pci_create_host_bridge interface, and
> refactoring it so that the call sequence becomes
>
> host = pci_create_host_bridge(parent, db, resources);
> host->sysdata = sysdata;
> __pci_scan_root_bus(host, ops);
>
> This way, we can make sysdata completely option. I assume that more of the
> fields we have in sysdata today can get moved into pci_host_bridge
> over time, so a host bridge driver can just assign those members individually
> between pci_create_host_bridge and __pci_scan_root_bus.

I put the sysdata in pci_host_bridge, because some platforms x86/ia64
need to call pcibios_root_bridge_prepare() before pci_host_bridge registration
in pci_create_host_bridge(), and pcibios_root_bridge_prepare() need the companion
acpi device pointer which is stored in sysdata.

I like you idea, but I haven't find a better way yet.

Thanks!
Yijing.

>
> Arnd
>
> .
>

--
Thanks!
Yijing