Re: [PATCH 2.6.26] PCI: refuse to re-add a device to a bus upon pci_scan_child_bus()

[Eran Liberty]

Matthew Wilcox wrote:
> If this is all alone on a bus of its own, we can certainly handle that.
> Maybe we can make it a module parameter or something.
>   
If my devices where the only one on the bus I would not have stumbled on 
this bug. I would have removed them all before reloading and would have 
scanned and empty PCI bus list after the reloading.

Alas, the CPU itself is a pci device. Upon scanning the bus it is it who 
is duplicated. Upon trying to "pci_bus_add_devices()" you get resource 
collision.

Do you perceive any down side to my suggested patch?
It seems (to me) really logical that a device can not and should not be 
added twice to a pci bus device list.

Liberty
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