On 8/27/18 1:24 AM, Ming Lei wrote:

Hi,

There is fundamental issue in commit 328728630d9f2bf1 (scsi: core: avoid
host-wide host_busy counter for scsi_mq) because SCSI's host busy counter
may not be same with counter of blk-mq's inflight tags, especially in case
of none io scheduler.

So please revert the two commits.

Please do, they break changing write cache mode on my SATA drives. You
can add my tested-by and/or reported-by to this.

-- 
Jens Axboe