If __nvme_submit_cmd races with nvme_dev_disable, nvmeq could have been suspended and dev->bar could have been unmapped. Do not touch sq door bell in this case.
Signed-off-by: Wenbo Wang <[email protected]> Reviewed-by: Wenwei Tao <[email protected]> CC: [email protected] --- drivers/nvme/host/pci.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index 8b1a725..2288712 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -325,7 +325,8 @@ static void __nvme_submit_cmd(struct nvme_queue *nvmeq, if (++tail == nvmeq->q_depth) tail = 0; - writel(tail, nvmeq->q_db); + if (likely(nvmeq->cq_vector >= 0)) + writel(tail, nvmeq->q_db); nvmeq->sq_tail = tail; } -- 1.8.3.1
