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

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Message-ID: <5313709.Qx2p1IPKbV@vostro.rjw.lan>
Date:	Tue, 15 Jan 2013 12:21:45 +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 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?

Rafael


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