On Fri, Aug 26, 2016@07:31:33AM -0700, Andy Lutomirski wrote:

 - Consider *deleting* the SCSI translation layer's power saving code.
It looks almost entirely bogus to me.  It has an off-by-one in its
NPSS handling, it hardcodes power state indices which is total BS, it
ignores the distinction between operational and non-operational states
(which I think matters for non-APST usage).  It also seems likely to
be that it's never been used, since it's one of the formerly
crashy-looking set_features users.

Please go ahead and send a patch to delete it.  Adding the whole SCSI
layer was a mistake to start with, and it's always been horribly buggy.
Until I started running the libiscsi testsuite even fairly normal I/O
commands were a sure way to crash it, and crazy things like PM are
almost guaranteed to a) not actually be used by real application and
b) horrible buggy (as you've already noticed)