linux-kernel - Re: [PATCH 3/3] PCI Hotplug: workaround for Thunderbolt on Intel DZ77RE-75K motherboard

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Date:	Thu, 13 Dec 2012 23:06:42 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Yinghai Lu <yinghai@...nel.org>,
	Greg KH <gregkh@...uxfoundation.org>,
	Miles J Penner <miles.j.penner@...el.com>,
	John Ronciak <john.ronciak@...el.com>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Tushar N Dave <tushar.n.dave@...el.com>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Amos Kong <kongjianjun@...il.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] PCI Hotplug: workaround for Thunderbolt on Intel DZ77RE-75K motherboard

On Thursday, December 13, 2012 10:49:53 PM Kirill A. Shutemov wrote:
> On Thu, Dec 13, 2012 at 12:30:04PM -0800, Linus Torvalds wrote:
> > On Thu, Dec 13, 2012 at 12:25 PM, Yinghai Lu <yinghai@...nel.org> wrote:
> > >
> > > Linus will not be happy with those kind of delay.
> > 
> > Indeed. And the DMI check is bogus too, since the "there can be
> > delays" is apparently part of the pcie hotplug spec.
> 
> It's ACPI PCI hotplug, not PCIe native hotplug. PCIe hotplug spec is not
> relevant.
> 
> IIUC, in ACPI case devices should be ready to be enumerated, before you
> get notification. Rafael, is it correct?

Not necessarily.  The ACPI nodes will be, the device themselves are still PCI
devices. :-)

Thanks,
Rafael


-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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