On Mon, Nov 06, 2017 at 05:07:31PM -0800, Bart Van Assche wrote:
> Since we are close to the merge window and since it is too late for
> reworking patches and algorithms that have turned out to be flawed,
> revert multiple recent patches. Revert patch "blk-mq: don't handle
> TAG_SHARED in restart" and all patches that conflict with the revert
> of that patch because that patch is based on an incorrect assumption,
> namely that the SCSI starved list can be used as a replacement for
> the blk-mq queue restarting mechanism. Revert patch "scsi: implement
> .get_budget and .put_budget for blk-mq" because it triggers an
> infinite loop on my test setup ("scsi 9:0:0:0: rejecting I/O to dead
> device" + RCU lockup complaint in blk_mq_sched_dispatch_requests()).
The loop can be fixed by
88022d7201e9 blk-mq: don't handle failure in .get_budget
--
Ming
