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SubjectFwd: [PATCH -v3 40/47] PCI: Add pci bus removal through /sys/.../pci_bus/.../remove
adding back the CC list

---------- Forwarded message ----------
From: Yinghai Lu <>
Date: Fri, Apr 6, 2012 at 9:24 AM
Subject: Re: [PATCH -v3 40/47] PCI: Add pci bus removal through
To: Bjorn Helgaas <>

On Fri, Apr 6, 2012 at 9:07 AM, Bjorn Helgaas <> wrote:
> On Fri, Apr 6, 2012 at 10:01 AM, Yinghai Lu <> wrote:
>> On Fri, Apr 6, 2012 at 8:50 AM, Jiang Liu <> wrote:
>>> Hi Yinghai,
>>>        I found many other drivers assume that a pci bus won't disappear if
>>> the corresponding PCI bridge device still exists. The sysfs interface proposed
>>> here breaks that assumption and may cause many access-after-free issues.
>>> So what's the purpose of this interface? Should we remove this interface or
>>> enhance other drivers to avoid invalid memory access issues?
> Can you point out some of the specifics about drivers making this
> assumption?  I'm not thrilled about the idea of removing a pci_bus
> while the upstream bridge pci_dev still exists either.

I noticed that too. some hotplug driver link to those child bus
instead of bridge...
So have prepared some local patches to handle them.

>> ok, will make it only show up on root bus.
> OK.  I'm still interested in the specifics because I don't like the
> way the pci_bus is exposed, even inside the kernel.  The bus itself is
> not an active entity, and we can't really do anything with it except
> by touching a device connected to it.

I want to keep that to remove root bus that is not added acpi root.

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