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nvme-pci: don't simple map sgl when sgls are disabled

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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: 297910571f ("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>
This commit is contained in:
Niklas Cassel 2021-04-09 20:12:55 +02:00 committed by Christoph Hellwig
parent ccc1003b5b
commit e51183be1f
1 changed files with 1 additions and 1 deletions
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2
drivers/nvme/host/pci.c
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@ -854,7 +854,7 @@ 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);