I'm not sure what you mean? For MSI there is only one MSI per device,
but this code is used also for MSI-X which supports > 1 MSI per device.

Or more specifically, for MSI, -linux- supports only one per device (in
theory, it's possible to have multiple MSI non-X but it's a mess).

Either way we shouldn't be incrementing hwirq by hand, it's reassigned
at the top of the loop. I think that's left over from old code that
allocated nvec hwirqs in a block and then created virq mappings for each
one, whereas the new code allocates each hwirq separately.

cheers

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