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nvme-pci: Hold cq_poll_lock while completing CQEs 

Completions need to consumed in the same order the controller submitted
them, otherwise future completion entries may overwrite ones we haven't
handled yet. Hold the nvme queue's poll lock while completing new CQEs to
prevent another thread from freeing command tags for reuse out-of-order.

Fixes: dabcefab45 ("nvme: provide optimized poll function for separate poll queues")
Signed-off-by: Bijan Mottahedeh <bijan.mottahedeh@oracle.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Keith Busch <kbusch@kernel.org>
This commit is contained in:
Bijan Mottahedeh 2020-02-26 18:53:43 -08:00 committed by Keith Busch
parent cae740a04b
commit 9515743bfb
1 changed files with 1 additions and 1 deletions
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2
drivers/nvme/host/pci.c
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@ -1078,9 +1078,9 @@ static int nvme_poll(struct blk_mq_hw_ctx *hctx)
spin_lock(&nvmeq->cq_poll_lock);
found = nvme_process_cq(nvmeq, &start, &end, -1);
nvme_complete_cqes(nvmeq, start, end);
spin_unlock(&nvmeq->cq_poll_lock);
nvme_complete_cqes(nvmeq, start, end);
return found;
}