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

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Message-ID: <CAErSpo6C-QMFCbMMivBE5TN4sEOFR_EyPmtN=OUNo8eN-+t=GQ@mail.gmail.com>
Date:	Wed, 5 Jun 2013 14:07:18 -0600
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Jiang Liu <liuj97@...il.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 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.

Bjorn
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