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

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Message-ID: <CAE9FiQV1pvteSymLp=pHi=fNjHcfGe+TA84s2Ob9Tfne54fOmg@mail.gmail.com>
Date:	Tue, 15 Jan 2013 07:44:21 -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 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.
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