linux-kernel - Re: [PATCH v3, part1 03/10] PCI: Convert alloc_pci_dev(void) to pci_alloc

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Date:	Fri, 07 Jun 2013 00:16:43 +0800
From:	Jiang Liu <liuj97@...il.com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
CC:	Yinghai Lu <yinghai@...nel.org>,
	Gu Zheng <guz.fnst@...fujitsu.com>,
	"Rafael J . Wysocki" <rjw@...k.pl>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Toshi Kani <toshi.kani@...com>,
	Myron Stowe <myron.stowe@...hat.com>,
	Yijing Wang <wangyijing@...wei.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Jiang Liu <jiang.liu@...wei.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	"David S. Miller" <davem@...emloft.net>,
	David Airlie <airlied@...ux.ie>,
	Neela Syam Kolli <megaraidlinux@....com>,
	"James E.J. Bottomley" <jbottomley@...allels.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
	sparclinux@...r.kernel.org,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>
Subject: Re: [PATCH v3, part1 03/10] PCI: Convert alloc_pci_dev(void) to pci_alloc_dev(bus)
 instead

On Thu 06 Jun 2013 04:07:18 AM CST, Bjorn Helgaas wrote:
> On Sat, May 25, 2013 at 7:48 AM, Jiang Liu <liuj97@...il.com> wrote:
>> From: Gu Zheng <guz.fnst@...fujitsu.com>
>>
>> Use the new pci_alloc_dev(bus) to replace the existing using of
>> alloc_pci_dev(void).
>> ...
>
>> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
>> index 26df9c8..d5d18a0 100644
>> --- a/drivers/pci/probe.c
>> +++ b/drivers/pci/probe.c
>> @@ -1130,6 +1130,7 @@ static void pci_release_dev(struct device *dev)
>>         struct pci_dev *pci_dev;
>>
>>         pci_dev = to_pci_dev(dev);
>> +       pci_bus_put(pci_dev->bus);
>>         pci_release_capabilities(pci_dev);
>>         pci_release_of_node(pci_dev);
>>         kfree(pci_dev);
>
> I think we should drop the pci_bus reference *last* (before the
> kfree).  Otherwise, we have to audit pci_release_capabilities() and
> pci_release_of_node() to make sure they don't use pci_dev->bus.
>
> I made this change on my branch already; just let me know if you object.
Hi Bjorn,
       You are right, thanks for fixing it.

>
> Bjorn


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