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

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Message-ID: <CAE9FiQV1tui+nHMFF419dpTOKt_x4US6R=3uPhDvUDJ0zoMrEg@mail.gmail.com>
Date:	Mon, 6 Jan 2014 11:28:43 -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 Thu, Jan 2, 2014 at 4:45 PM, Rafael J. Wysocki <rjw@...ysocki.net> wrote:
> On Thursday, January 02, 2014 02:47:04 PM Yinghai Lu wrote:
>>
>> No. It should be before removing all root bus devices.
>> as they need to access the pci devices during stop ioapic and dmar.
>>
>> Also ioapic itself could one one pci device.
>
> Well, if we stop drivers first, then stop ioapic/dmar and *then* remove
> devices, it is possible to rebind a driver to a device after ioapic/dmar has
> been stopped, which I guess will not lead to anything nice?

Not sure how that could happen.

If it would really happen, we could set dev->match_driver to 0 in pci_stop_dev.

Yinghai
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