linux-kernel - Re: [PATCH 1/2] pci: pci_bridge_release

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Date:	Mon, 07 Dec 2009 13:57:29 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	patrick.keller@...com
CC:	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Chiang, Alexander" <achiang@...com>,
	"Helgaas, Bjorn" <bjorn.helgaas@...com>,
	Ingo Molnar <mingo@...e.hu>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Ivan Kokshaysky <ink@...assic.park.msu.ru>
Subject: Re: [PATCH 1/2] pci: pci_bridge_release_res

Patrick Keller wrote:
> 
> On Tue, 2009-12-01 at 01:19 +0000, Yinghai Lu wrote:
>> need to apply this after 9/9 patchset
>>
>> prepare for pciehp_realloc
>>
>> it will clear the resource size for bridge
>>
>> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
>>
>> ---
>>  drivers/pci/setup-bus.c |   42 ++++++++++++++++++++++++++++++++++++++++++
>>  include/linux/pci.h     |    1 +
>>  2 files changed, 43 insertions(+)
>>
>> Index: linux-2.6/drivers/pci/setup-bus.c
>> ===================================================================
>> --- linux-2.6.orig/drivers/pci/setup-bus.c
>> +++ linux-2.6/drivers/pci/setup-bus.c
>> @@ -739,6 +739,48 @@ static void __ref __pci_bridge_assign_re
>>  		break;
>>  	}
>>  }
>> +
>> +void pci_bridge_release_res(struct pci_bus *bus)
>> +{
>> +	int idx;
>> +	bool changed = false;
>> +	struct pci_dev *dev;
>> +	struct resource *r;
>> +
>> +	/* The root bus? */
>> +	if (!bus->self)
>> +		return;
>> +
>> +	/* for pci bridges res only */
>> +	dev = bus->self;
>> +	if ((dev->class >> 8) != PCI_CLASS_BRIDGE_PCI)
>> +		return;
>> +
>> +	for (idx = PCI_BRIDGE_RESOURCES; idx < PCI_BRIDGE_RESOURCES + 3;
>> +	     idx++) {
>> +		r = &dev->resource[idx];
>> +		if (!r->parent)
>> +			continue;
>> +
>> +		/* if there are children under that, we should not release it */
>> +		if (r->child)
>> +			continue;
>> +
>> +		if (!release_resource(r)) {
>> +			dev_printk(KERN_DEBUG, &dev->dev,
>> +				 "resource %d %pR released\n", idx, r);
>> +			/* old size is not kept */
>> +			r->start = 0;
>> +			r->end   = 0;
>> +			r->flags = 0;
>> +			changed = true;
>> +		}
>> +	}
>> +
>> +	if (changed)
>> +		pci_setup_bridge(bus);
>> +}
>> +
> 
> Need to add EXPORT_SYMBOL(pci_bridge_release_res); here so the hotplug
> kernel module will find this function.

thanks, will update that in next round.

YH
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