[PATCH] nvme-multipath: fix io accounting on failover

[Keith Busch]

On Tue, May 21, 2024 at 02:35:44PM -0400, John Meneghini wrote:
> Awesome. I've noticed that there is an iostat bug lurking someplace during
> my many days of io policy testing these last two weeks. I'll add this patch
> to my test build and let you know if it fixes the problem!

I was testing CMIC capable PCI devices. The nvme-pci driver is currently
the only one batching completions, and that had a different multipath
accounting bug. I had to fix that before I could validate this patch,
and this one has a dependency on that first fix, which is here:

  https://lore.kernel.org/linux-nvme/20240521170537.2029233-1-kbusch@meta.com/T/#u