[PATCH] nvmet: Fix controller serial number inconsistency

[Christoph Hellwig]

On Thu, Aug 04, 2016 at 01:43:24PM +0300, Sagi Grimberg wrote:
> The host is allowed to issue identify as many times
> as it wants, we need to stay consistent when reporting
> the serial number for a given controller.

Looks fine:

Reviewed-by: Christoph Hellwig <hch at lst.de>

And we really should have a regression test for this using
the passthrough ioctl..