linux-kernel - Re: [PATCH][tentative] PCI / ACPI: Rework PCI host bridge removal to avoid sysfs warnings

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Message-ID: <CAE9FiQVEqnWm1j0GckuNsD_FTPxWahZpCnF79sNgKN-JnCDT+w@mail.gmail.com>
Date:	Tue, 31 Dec 2013 10:45:46 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Linux PCI <linux-pci@...r.kernel.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>,
	Tejun Heo <tj@...nel.org>
Subject: Re: [PATCH][tentative] PCI / ACPI: Rework PCI host bridge removal to
 avoid sysfs warnings

On Mon, Dec 30, 2013 at 5:15 AM, Rafael J. Wysocki <rjw@...ysocki.net> wrote:
> On Monday, December 30, 2013 01:51:28 PM Rafael J. Wysocki wrote:
>> > We have patches that need to stop ioapic and iommu between
>> > pci_stop_root_bus and pci_remove_root_bus.
>
> BTW, what *exactly* do they need to be stopped between?  After these two patches:

need to stop regular pci drivers before stop "driver" for ioapic/dmar.

>
>> > Please check if the problem still happen after
>> >
>> > http://git.kernel.org/cgit/linux/kernel/git/helgaas/pci.git/patch/?id=c4a0a5d964e90b93eb4101c3927b788e083e530f
>> >
>> > http://git.kernel.org/cgit/linux/kernel/git/helgaas/pci.git/patch/?id=e3b439e1d315aff59c1b4f0fc43c5cd2d82b4138
>
> pci_stop_root_bus() is just a walk over devices on the root bus stopping
> them and pci_remove_root_bus() starts with the removal of those devices.
>
> Surely, those two list walks can be combined into one?

maybe ok, but we have to problem to make sure stop pci drivers before
"driver" for ioapic/dmar.

also stop all first and remove all make it much cleaner.

and add path is two steps too. Add them all, and then attach driver for all.

Thanks

Yinghai
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