From: Niklas Cassel niklas.cassel@wdc.com
[ Upstream commit e51183be1fa96dc6d3cd11b3c25a0f595807315e ]
According to the module parameter description for sgl_threshold, a value of 0 means that SGLs are disabled.
If SGLs are disabled, we should respect that, even for the case where the request is made up of a single physical segment.
Fixes: 297910571f08 ("nvme-pci: optimize mapping single segment requests using SGLs") Signed-off-by: Niklas Cassel niklas.cassel@wdc.com Signed-off-by: Christoph Hellwig hch@lst.de Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/nvme/host/pci.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index 999378fb4d76..0cf84aa1c320 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -852,7 +852,7 @@ static blk_status_t nvme_map_data(struct nvme_dev *dev, struct request *req, return nvme_setup_prp_simple(dev, req, &cmnd->rw, &bv);
- if (iod->nvmeq->qid && + if (iod->nvmeq->qid && sgl_threshold && dev->ctrl.sgls & ((1 << 0) | (1 << 1))) return nvme_setup_sgl_simple(dev, req, &cmnd->rw, &bv);