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

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