linux-kernel - Re: [PATCH v2, part 1 3/9] PCI: Convert alloc_pci_dev(void) to pci_alloc

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Message-ID: <CAE9FiQVKKKmZRQ8CcKCzU8Gqzwb5SjWYagVB2OZiRqbSWXVpiw@mail.gmail.com>
Date:	Mon, 13 May 2013 10:23:29 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Jiang Liu <liuj97@...il.com>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	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 Mailing List <linux-kernel@...r.kernel.org>,
	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@...ts.ozlabs.org,
	"sparclinux@...r.kernel.org" <sparclinux@...r.kernel.org>,
	Linux-Scsi <linux-scsi@...r.kernel.org>,
	Jiang Liu <jiang.liu@...wei.com>
Subject: Re: [PATCH v2, part 1 3/9] PCI: Convert alloc_pci_dev(void) to
 pci_alloc_dev(bus) instead

On Mon, May 13, 2013 at 9:08 AM, Jiang Liu <liuj97@...il.com> wrote:
> From: Gu Zheng <guz.fnst@...fujitsu.com>
> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
> index 4f0bc0a..bc075a3 100644
> --- a/drivers/pci/probe.c
> +++ b/drivers/pci/probe.c
> @@ -1131,6 +1131,7 @@ 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);
> @@ -1269,11 +1270,10 @@ static struct pci_dev *pci_scan_device(struct pci_bus *bus, int devfn)
>         if (!pci_bus_read_dev_vendor_id(bus, devfn, &l, 60*1000))
>                 return NULL;
>
> -       dev = alloc_pci_dev();
> +       dev = pci_alloc_dev(bus);
>         if (!dev)
>                 return NULL;
>
> -       dev->bus = bus;
>         dev->devfn = devfn;
>         dev->vendor = l & 0xffff;
>         dev->device = (l >> 16) & 0xffff;

in pci_setup_device() fail path, it release the ref to that bus.

Yinghai
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