K 10
svn:author
V 3
mav
K 8
svn:date
V 27
2019-08-27T04:03:42.230587Z
K 7
svn:log
V 271
MFC r351320: Formalize NVMe controller consumer life cycle.

This fixes possible double call of fail_fn, for example on hot removal.
It also allows ctrlr_fn to safely return NULL cookie in case of failure
and not get useless ns_fn or fail_fn call with NULL cookie later.

END