Re: linux-next scsi-mq hang in suspend-resume

I still haven't gotten hold of an i915 machine where I could
run the actua ltest suite.

But I did some audit of the code, and it seems blk-mq is lacking
support for the RQF_PM flag.  While I can't directly see how
this would cause the hang your caused it's a least easy to test.

Can you apply the patch below and test with the use_blk_mq=0 parameter?

Note that implementing RQF_PM for blk-mq shouldn't be too hard either,
but if we don't get rid of the nr_pending counter somehow it would
be a severe performance penalty for all scsi devices.