Re: [PATCH v2 17/28] thunderbolt: Add support for full PCIe daisy chains

[Mika Westerberg]

On Mon, Mar 25, 2019 at 12:16:16PM +0100, Lukas Wunner wrote:
> Yes, but my point is that it doesn't make much sense to establish a tunnel
> between a switch and one of its parent switches unless that parent switch
> is reachable from the root switch over a PCI tunnel or a series of PCI
> tunnels.
>
> It may be worth checking that condition, or, if new tunnels are established
> top-down in the daisy-chain and tunnel establishment has failed for a
> switch, to not establish tunnels for switches beyond that one.

OK, got it :)