[PATCH 0/4] nvme-blkmq fixes

[Keith Busch]

On Mon, 22 Dec 2014, Jens Axboe wrote:
> Should be enough to just check for ->rq_pool being initialized or not - if it 
> is, we could have waiters and we know the waitqueues have been setup, etc.
>
> V2 attached.

Yep, that fixes the bug.

I'm not sure I follow your suggestion for forcing bt_get() to abandon
allocating a request tag when the queue is dying. If hctx_may_queue()
fails, it returns a generic error and bt_get() reschedules itself. Should
a different error than -1 be returned if the queue is dying?