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NVMe: Memory barrier before queue_count is incremented 

Protects against reordering and/or preempting which would allow the
kthread to access the queue descriptor before it is set up

Signed-off-by: Jon Derrick <jonathan.derrick@intel.com>
Acked-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Jon Derrick 2015-05-27 12:26:23 -06:00 committed by Jens Axboe
parent 4cc06521ee
commit 36a7e993ee
1 changed files with 4 additions and 1 deletions
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5
drivers/block/nvme-core.c
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@ -1453,9 +1453,12 @@ static struct nvme_queue *nvme_alloc_queue(struct nvme_dev *dev, int qid,
nvmeq->q_db = &dev->dbs[qid * 2 * dev->db_stride];
nvmeq->q_depth = depth;
nvmeq->qid = qid;
dev->queue_count++;
dev->queues[qid] = nvmeq;
/* make sure queue descriptor is set before queue count, for kthread */
mb();
dev->queue_count++;
return nvmeq;
free_cqdma: