[PATCHv3] nvme: generate uevent once a multipath namespace is operational again

[Christoph Hellwig]

On Tue, May 18, 2021 at 08:59:09AM +0200, Hannes Reinecke wrote:
>> I asked this on v1, is this only needed for mpath devices?
>
> Yes; we need to send the KOBJ_CHANGE event on the mpath device as it's not 
> backed by hardware. The only non-multipathed devices I've seen so far are 
> PCI devices where events are generated by the PCI device itself.

Which really goes back to my repeared request to add a comment to the
code to document why we need this uevent.  It surely looks out of place
and it seems Hannes can tell a story of why it is required.  I'd really
like to see that story next to the call.