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From: Liu ping fan <kernelfans@gmail.com>
To: Jiang Liu <liuj97@gmail.com>
Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
	Scott Murray <scott@spiteful.org>,
	Bjorn Helgaas <bhelgaas@google.com>
Subject: Re: pci: question about the life cycle of pci_dev and its parent pci_bus
Date: Mon, 27 Aug 2012 09:54:42 +0800	[thread overview]
Message-ID: <CAFgQCTs_8WSpmqXwQUznb-hz=VNxHkuAmR5J22O62d1qw7Smgg@mail.gmail.com> (raw)
In-Reply-To: <50379008.3080500@gmail.com>

On Fri, Aug 24, 2012 at 10:30 PM, Jiang Liu <liuj97@gmail.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
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
>> the body of a message to majordomo@vger.kernel.org
>> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>> Please read the FAQ at  http://www.tux.org/lkml/
>>
>

      reply	other threads:[~2012-08-27  1:54 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-08-23  5:24 pci: question about the life cycle of pci_dev and its parent pci_bus Liu ping fan
2012-08-24 14:30 ` Jiang Liu
2012-08-27  1:54   ` Liu ping fan [this message]

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