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

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Message-ID: <CAE9FiQXuA3XC20CjSkbtc0L52ZsUKVtV=7c7vfKCYCR6execnA@mail.gmail.com>
Date:	Tue, 15 Jan 2013 14:03:45 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
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 Tue, Jan 15, 2013 at 1:52 PM, Rafael J. Wysocki <rjw@...k.pl> wrote:
> 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).
>

ok.
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