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

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Message-ID: <50379008.3080500@gmail.com>
Date:	Fri, 24 Aug 2012 22:30:32 +0800
From:	Jiang Liu <liuj97@...il.com>
To:	Liu ping fan <kernelfans@...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

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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