downstream pci walk

[Valdis.Kletnieks at vt.edu]

On Thu, 17 Jul 2014 05:58:03 +0800, Amerei Acuna said:

> I'm writing a custom PCI driver for a hobby endpoint. Due to some
> "special", possibly unique, circumstance, I need to determine if two
> devices form a pair. As I'm using a PCI switch to connect these two
> devices, I'm thinking on the possibility of checking if the two devices
> share a common pci-pci bridge (or finding the least common ancestor in a
> directed graph).

What happens if your two devices and a totally unrelated PCI device
are all three downstream of the same PCI bridge?

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