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

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Date:	Tue, 14 May 2013 22:59:02 +0800
From:	Liu Jiang <liuj97@...il.com>
To:	Gu Zheng <guz.fnst@...fujitsu.com>
CC:	Yinghai Lu <yinghai@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.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 05/14/2013 04:26 PM, Gu Zheng wrote:
> On 05/14/2013 01:23 AM, Yinghai Lu wrote:
>
>> 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.
> Yes, you're right, we need to release the bus' ref if pci_setup_device() failed.
Hi Zheng,
     I suggest to use pci_release_dev() instead because it also needs to 
release OF related resources.
I will update it in next version.

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index bc075a3..2ac6338 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -1281,7 +1281,7 @@ static struct pci_dev *pci_scan_device(struct 
pci_bus *bus
         pci_set_of_node(dev);

         if (pci_setup_device(dev)) {
-               kfree(dev);
+               pci_release_dev(&dev->dev);
                 return NULL;
         }


> hanks for your correction.:)
>
> Best regards,
> Gu
>
>> Yinghai
>>
>

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