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NVMe: Requeue requests on suspended queues 

It's possible a request may get to the driver after the nvme queue was
disabled. This has the request requeue if that happens.

Note the request is still "started" by the driver, but requeuing will
clear the start state for timeout handling.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Keith Busch 2016-02-11 13:05:42 -07:00 committed by Jens Axboe
parent ef2d4615c5
commit ae1fba2001
1 changed files with 5 additions and 0 deletions
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5
drivers/nvme/host/pci.c
View File

@ -678,6 +678,11 @@ static int nvme_queue_rq(struct blk_mq_hw_ctx *hctx,
blk_mq_start_request(req);
spin_lock_irq(&nvmeq->q_lock);
if (unlikely(nvmeq->cq_vector < 0)) {
ret = BLK_MQ_RQ_QUEUE_BUSY;
spin_unlock_irq(&nvmeq->q_lock);
goto out;
}
__nvme_submit_cmd(nvmeq, &cmnd);
nvme_process_cq(nvmeq);
spin_unlock_irq(&nvmeq->q_lock);