linux-kernel - Re: [PATCH 10/28] PCI: Save sysdata in pci_host

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Message-ID: <18973877.BYCS6vtzoq@wuerfel>
Date:	Fri, 16 Jan 2015 10:18:59 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Yijing Wang <wangyijing@...wei.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Liviu Dudau <liviu@...au.co.uk>,
	Tony Luck <tony.luck@...el.com>,
	Russell King <linux@....linux.org.uk>,
	Marc Zyngier <marc.zyngier@....com>, linux-pci@...r.kernel.org,
	x86@...nel.org, linux-kernel@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	linux-m68k@...ts.linux-m68k.org,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	linux-alpha@...r.kernel.org, linux-ia64@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Guan Xuetao <gxt@...c.pku.edu.cn>,
	Yinghai Lu <yinghai@...nel.org>,
	Jiang Liu <jiang.liu@...ux.intel.com>
Subject: Re: [PATCH 10/28] PCI: Save sysdata in pci_host_bridge drvdata

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.

	Arnd
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