[PATCH] nvme: fix lightnvm check

[Christoph Hellwig]

On Wed, Sep 06, 2017 at 11:06:04AM -0400, Keith Busch wrote:
> Ugh, even with this quirk, new lightnvm device will be broken for
> all existing kernels. This sort of thing really could benefit from a
> standard's defined capability or command set supported bit to distinguish
> lightnvm devices. Lacking that, this looks like the only thing we can
> do at the moment.

I told them to register a different class code for these devices a long
time ago, but nothing happened.  Then again I might underestimate the
complexity of getting a class code..