[PATCH v2 01/13] nvdimm/btt: do not call del_gendisk() if not needed

[Christoph Hellwig]

On Wed, Nov 03, 2021 at 05:21:45AM -0700, Luis Chamberlain wrote:
> del_gendisk() is not required if the disk has not been added.
> On kernels prior to commit 40b3a52ffc5bc3 ("block: add a sanity
> check for a live disk in del_gendisk") it is mandatory to not
> call del_gendisk() if the underlying device has not been through
> device_add().

And even with the sanity check is it wrong, and will trigger a WARN_ON.
So maybe this commit log could use a little update?

With that fixed I think this should go into 5.16 and -stable.

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