linux-kernel - Re: [PATCH v8 02/22] PCI: Add root bus children dev's res to fail list

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Date:	Tue, 15 Jan 2013 22:52:47 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>, Len Brown <lenb@...nel.org>,
	Taku Izumi <izumi.taku@...fujitsu.com>,
	Jiang Liu <jiang.liu@...wei.com>, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org
Subject: Re: [PATCH v8 02/22] PCI: Add root bus children dev's res to fail list

On Tuesday, January 15, 2013 07:44:21 AM Yinghai Lu wrote:
> On Tue, Jan 15, 2013 at 3:21 AM, Rafael J. Wysocki <rjw@...k.pl> wrote:
> > On Monday, January 14, 2013 10:23:47 PM Yinghai Lu wrote:
> >> On Sat, Jan 12, 2013 at 1:37 PM, Rafael J. Wysocki <rjw@...k.pl> wrote:
> >> > On Friday, January 11, 2013 02:40:29 PM Yinghai Lu wrote:
> >> >> We can stop trying according to try number now and do not need to use
> >> >> root_bus checking as stop sign anymore.
> >> >>
> >> >> In extreme case we could need to reallocate resource for device just
> >> >> under root bus.
> >> >
> >> > Well, the above says that we _can_ do the change, but it doesn't explain why it
> >> > is needed.  So what's the reason why we need to do that?
> >>
> >> In extreme case we could need to reallocate resource for device just
> >> under root bus.
> >>
> >> otherwise, those devices just under root bus will not be assigned
> >> resources again.
> >
> > IOW, our current code will not cover the case when we hot plug a host bridge
> > and need to reassign resources for devices integrated into it?
> 
> yes. in extreme case if _CRS range is not big enough.

It would be good to say that in the changelog too.  It's a clear justification
for the change if we're going to support root bridge hotplug (which we are).

Thanks,
Rafael


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