From: Jiang Liu <liuj97@gmail.com>
To: Liu ping fan <kernelfans@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: Fri, 24 Aug 2012 22:30:32 +0800 [thread overview]
Message-ID: <50379008.3080500@gmail.com> (raw)
In-Reply-To: <CAFgQCTt82Mu2mhVxeZ01=1bJzuzDWZjBEV58X9xjeEPQY3R8ww@mail.gmail.com>
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.
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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next prev parent reply other threads:[~2012-08-24 14:30 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 [this message]
2012-08-27 1:54 ` Liu ping fan
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