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

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Message-ID: <6423213.ATyOvMNh1o@vostro.rjw.lan>
Date:	Sat, 12 Jan 2013 22:37:09 +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 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?

Rafael


> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
> ---
>  drivers/pci/setup-bus.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
> index 6d3591d..7e8739e 100644
> --- a/drivers/pci/setup-bus.c
> +++ b/drivers/pci/setup-bus.c
> @@ -283,7 +283,7 @@ static void assign_requested_resources_sorted(struct list_head *head,
>  		idx = res - &dev_res->dev->resource[0];
>  		if (resource_size(res) &&
>  		    pci_assign_resource(dev_res->dev, idx)) {
> -			if (fail_head && !pci_is_root_bus(dev_res->dev->bus)) {
> +			if (fail_head) {
>  				/*
>  				 * if the failed res is for ROM BAR, and it will
>  				 * be enabled later, don't add it to the list
> 
-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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