[PATCH v5] conversion to blk-mq

[Keith Busch]

On Wed, 4 Jun 2014, Jens Axboe wrote:
> On 06/04/2014 12:28 PM, Keith Busch wrote:
> Are you testing against 3.13? You really need the current tree for this,
> otherwise I'm sure you'll run into issues (as you appear to be :-)

I'm using Matias' current tree:

git://github.com/MatiasBjorling/linux-collab nvmeq_wip_6

Is this the right one to use? Looks like a 3.15rc1+.

Also ... obviously that's the wrong diff from before. I didn't save my
file before creating the diff. Should have looked like this:

diff --git a/block/blk-mq.c b/block/blk-mq.c
index d10013b..d1b986c 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -105,7 +105,8 @@ static int blk_mq_queue_enter(struct request_queue *q)
  	__percpu_counter_add(&q->mq_usage_counter, 1, 1000000);
  	smp_wmb();
  	/* we have problems to freeze the queue if it's initializing */
-	if (!blk_queue_bypass(q) || !blk_queue_init_done(q))
+	if (!blk_queue_dying(q) && (!blk_queue_bypass(q) ||
+					!blk_queue_init_done(q)))
  		return 0;

  	__percpu_counter_add(&q->mq_usage_counter, -1, 1000000);