[PATCHv2] nvme: generate uevent once a multipath namespace is operational again

[Christoph Hellwig]

On Tue, May 11, 2021 at 10:03:08AM +0200, Hannes Reinecke wrote:
> In an all paths down scenario I/O will be requeued or aborted, so no
> further I/O will be ongoing on this namespace.
> This leaves upper layers like MD unable to determine if the namespace
> becomes operational again after a successful controller reset.
> This patch will send an uevent per multipathed namespace once the
> underlying controller is LIVE, allowing MD to start resync.

Can you please also add a comment why we are sending the event?