[PATCH v6] NVMe: conversion to blk-mq

[Ming Lei]

On Mon, Jun 9, 2014 at 3:53 PM, Ming Lei <tom.leiming at gmail.com>
>
> After pulling from your tree, the problem still persists.
>
> I test nvme over qemu, and both linus/next tree can
> work well with qemu nvme.

One problem I found is that rq->start_time isn't set
after you cleared IO_STAT intentionally, then the
request can't be requeued any more. Once the request
can be requeued, the problem becomes req hanging.

The root cause is that device returns
NVME_INTERNAL_DEV_ERROR(0x6) with your conversion
patch.

Thanks,
-- 
Ming Lei