linux-kernel - Re: [PATCH 11/28] PCI: Introduce pci_host_bridge

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Message-ID: <3832604.lYie7PXiOd@wuerfel>
Date:	Fri, 16 Jan 2015 10:35:30 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Yijing Wang <wangyijing@...wei.com>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Jiang Liu <jiang.liu@...ux.intel.com>,
	linux-pci@...r.kernel.org, Yinghai Lu <yinghai@...nel.org>,
	linux-kernel@...r.kernel.org, Marc Zyngier <marc.zyngier@....com>,
	linux-arm-kernel@...ts.infradead.org,
	Russell King <linux@....linux.org.uk>, x86@...nel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Tony Luck <tony.luck@...el.com>, linux-ia64@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Guan Xuetao <gxt@...c.pku.edu.cn>, linux-alpha@...r.kernel.org,
	linux-m68k@...ts.linux-m68k.org, Liviu Dudau <liviu@...au.co.uk>,
	Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: Re: [PATCH 11/28] PCI: Introduce pci_host_bridge_ops to setup host bridge

On Friday 16 January 2015 10:23:11 Arnd Bergmann wrote:
> On Friday 16 January 2015 09:44:09 Yijing Wang wrote:
> > @@ -2064,7 +2073,7 @@ 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, sysdata);
> > +       host = pci_create_host_bridge(parent, db, resources, sysdata, NULL);
> >         if (!host)
> >                 return NULL;
> >  
> > 
> 
> Same comment as for patch 10: If we leave this out of the pci_create_host_bridge
> argument but set it later, þe interface becomes simpler for callers that
> don't have custom pci_host_bridge_ops.
> 
> This would break your phb_prepare() callback, but I assume a host driver
> can just make a direct function call before entering pci_create_host_bridge
> for this. Let me know if I'm missing something here.

I've read the later patches now that explain why it's needed, so nevermind
my comment above.

	Arnd
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