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NVMe: Initialize iod nents to 0

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For commands that do not map a scatter list, we need to initilaize the iod's
number of sg entries (nents) to 0 and not unmap in this case.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
This commit is contained in:
Keith Busch 2012-11-06 11:59:23 -07:00 committed by Matthew Wilcox
parent 6ecec74520
commit 2b19603415
1 changed files with 3 additions and 1 deletions
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4
drivers/block/nvme.c
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@ -337,6 +337,7 @@ nvme_alloc_iod(unsigned nseg, unsigned nbytes, gfp_t gfp)
iod->offset = offsetof(struct nvme_iod, sg[nseg]);
iod->npages = -1;
iod->length = nbytes;
iod->nents = 0;
}
return iod;
@ -377,7 +378,8 @@ static void bio_completion(struct nvme_dev *dev, void *ctx,
struct bio *bio = iod->private;
u16 status = le16_to_cpup(&cqe->status) >> 1;
dma_unmap_sg(&dev->pci_dev->dev, iod->sg, iod->nents,
if (iod->nents)
dma_unmap_sg(&dev->pci_dev->dev, iod->sg, iod->nents,
bio_data_dir(bio) ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
nvme_free_iod(dev, iod);
if (status) {