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>
(cherry picked from commit 2850713576e81e3b887cd92a9965fba0dd1717c0)

Orabug: 25130845

Signed-off-by: Ashok Vairavan <ashok.vairavan@oracle.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 6219995dc7c6f053691545bcae77761657628ae8..1a2702b16740b92ae852fefc01ba4f4101da8062 100644 (file)
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -728,6 +728,11 @@ 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);