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nvme-pci: ensure we're polling a polled queue

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A user can change the polled queue count at run time. There's a brief
window during a reset where a hipri task may try to poll that queue
before the block layer has updated the queue maps, which would race with
the now interrupt driven queue and may cause double completions.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Kanchan Joshi <joshi.k@samsung.com>
Signed-off-by: Keith Busch <kbusch@kernel.org>
This commit is contained in:
Keith Busch 2026-02-10 09:26:54 -08:00
parent bbdaa8c17c
commit 166e31d7db
1 changed files with 2 additions and 1 deletions
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3
drivers/nvme/host/pci.c
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@ -1627,7 +1627,8 @@ static int nvme_poll(struct blk_mq_hw_ctx *hctx, struct io_comp_batch *iob)
struct nvme_queue *nvmeq = hctx->driver_data;
bool found;
if (!nvme_cqe_pending(nvmeq))
if (!test_bit(NVMEQ_POLLED, &nvmeq->flags) ||
!nvme_cqe_pending(nvmeq))
return 0;
spin_lock(&nvmeq->cq_poll_lock);