linux-kernel - Re: [PATCH 01/28] PCI: Rip out pci_bus_add_devices() from pci_scan

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Date:	Fri, 16 Jan 2015 15:16:28 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Yijing Wang <wangyijing@...wei.com>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Jiang Liu <jiang.liu@...ux.intel.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Marc Zyngier <marc.zyngier@....com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Russell King <linux@....linux.org.uk>,
	"the arch/x86 maintainers" <x86@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Tony Luck <tony.luck@...el.com>,
	"linux-ia64@...r.kernel.org" <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>,
	Arnd Bergmann <arnd@...db.de>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	"sparclinux@...r.kernel.org" <sparclinux@...r.kernel.org>
Subject: Re: [PATCH 01/28] PCI: Rip out pci_bus_add_devices() from pci_scan_bus()

On Fri, Jan 16, 2015 at 3:15 PM, Yinghai Lu <yinghai@...nel.org> wrote:
> On Thu, Jan 15, 2015 at 5:43 PM, Yijing Wang <wangyijing@...wei.com> wrote:
>> Pci_bus_add_devices() should not be placed in pci_scan_bus().
>> Now pci device will be added to driver core once its
>> creation. All things left in pci_bus_add_devices() are
>> driver attachment and other trivial sysfs things.
>> Pci_scan_bus() should be the function responsible for
>> scanning PCI devices, not including driver attachment.
>> Other, some callers(m68k,unicore32,alpha) of pci_scan_bus()
>> will call pci_bus_size_bridges() and pci_bus_assign_resources()
>> after pci_scan_bus().
>>
>> E.g.
>> In m68k
>> mcf_pci_init()
>>         pci_scan_bus()
>>                 ...
>>                 pci_bus_add_devices() --- try to attach driver
>>         pci_fixup_irqs()
>>         pci_bus_size_bridges()
>>         pci_bus_assign_resources()
>>
>> It is not correct, resources should be assigned correctly
>> before attaching driver.
>
No, for booting path, at that time pci drivers are *NOT* loaded yet.

Thanks

Yinghai
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