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 16:26:38 +0800
From:	Gu Zheng <guz.fnst@...fujitsu.com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	Jiang Liu <liuj97@...il.com>, 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 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.
Thanks for your correction.:)

Best regards,
Gu

> 
> Yinghai
> 



View attachment "Convert-alloc_pci_dev-void-to-pci_alloc_dev-v3.patch" of type "text/plain" (5296 bytes)