linux-kernel - Re: pci: question about the life cycle of pci_dev and its parent pci

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Message-ID: <CAFgQCTs_8WSpmqXwQUznb-hz=VNxHkuAmR5J22O62d1qw7Smgg@mail.gmail.com>
Date:	Mon, 27 Aug 2012 09:54:42 +0800
From:	Liu ping fan <kernelfans@...il.com>
To:	Jiang Liu <liuj97@...il.com>
Cc:	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	Scott Murray <scott@...teful.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: pci: question about the life cycle of pci_dev and its parent pci_bus

On Fri, Aug 24, 2012 at 10:30 PM, Jiang Liu <liuj97@...il.com> wrote:
> Hi Pingfan,
>
>         We have realized the same when implementing lock mechanisms for PCI hotplug
> operations, and we are planning to holding a reference to parent bus for each pci dev.

Thanks! You save me from searching such codes.
Regards,
pingfan

>         Regards!
>         Gerry
>
> On 08/23/2012 01:24 PM, Liu ping fan wrote:
>> Hi,
>>
>> I have a question about the life cycle of pci_dev and its parent pci_bus.
>> In pci_destroy_dev(), we remove the pci_dev from the bus_list, so
>> pci_dev is isolated from its parent pci_bus, and their life cycle are
>> independent too. But it seems that in pci_dev, we can still access the
>> pci_bus from the pointer pci_dev->bus.  To resolve such issue, I think
>> during the pci_dev removal,  there should be process to 1.prevent the
>> reader incoming 2. ensure the current reader has exit.  But can not
>> find them.
>>
>> Could anyone tell me?
>>
>> Thanx, pingfan
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