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nvme-pci: merge nvme_free_iod into nvme_unmap_data 

This means we now have a function that undoes everything nvme_map_data
does and we can simplify the error handling a bit.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Keith Busch <keith.busch@intel.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
This commit is contained in:
Christoph Hellwig 2019-03-03 08:15:19 -07:00
parent 915f04c93d
commit 7fe07d14f7
1 changed files with 17 additions and 27 deletions
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44
drivers/nvme/host/pci.c
View File

@ -583,14 +583,24 @@ static inline bool nvme_pci_use_sgls(struct nvme_dev *dev, struct request *req)
return true;
}
static void nvme_free_iod(struct nvme_dev *dev, struct request *req)
static void nvme_unmap_data(struct nvme_dev *dev, struct request *req)
{
struct nvme_iod *iod = blk_mq_rq_to_pdu(req);
enum dma_data_direction dma_dir = rq_data_dir(req) ?
DMA_TO_DEVICE : DMA_FROM_DEVICE;
const int last_prp = dev->ctrl.page_size / sizeof(__le64) - 1;
dma_addr_t dma_addr = iod->first_dma, next_dma_addr;
int i;
if (iod->nents) {
/* P2PDMA requests do not need to be unmapped */
if (!is_pci_p2pdma_page(sg_page(iod->sg)))
dma_unmap_sg(dev->dev, iod->sg, iod->nents, dma_dir);
if (blk_integrity_rq(req))
dma_unmap_sg(dev->dev, &iod->meta_sg, 1, dma_dir);
}
if (iod->npages == 0)
dma_pool_free(dev->prp_small_pool, nvme_pci_iod_list(req)[0],
dma_addr);
@ -847,50 +857,30 @@ static blk_status_t nvme_map_data(struct nvme_dev *dev, struct request *req,
ret = nvme_pci_setup_prps(dev, req, &cmnd->rw);
if (ret != BLK_STS_OK)
goto out_unmap;
goto out;
ret = BLK_STS_IOERR;
if (blk_integrity_rq(req)) {
if (blk_rq_count_integrity_sg(q, req->bio) != 1)
goto out_unmap;
goto out;
sg_init_table(&iod->meta_sg, 1);
if (blk_rq_map_integrity_sg(q, req->bio, &iod->meta_sg) != 1)
goto out_unmap;
goto out;
if (!dma_map_sg(dev->dev, &iod->meta_sg, 1, dma_dir))
goto out_unmap;
goto out;
cmnd->rw.metadata = cpu_to_le64(sg_dma_address(&iod->meta_sg));
}
return BLK_STS_OK;
out_unmap:
dma_unmap_sg(dev->dev, iod->sg, iod->nents, dma_dir);
out:
nvme_free_iod(dev, req);
nvme_unmap_data(dev, req);
return ret;
}
static void nvme_unmap_data(struct nvme_dev *dev, struct request *req)
{
struct nvme_iod *iod = blk_mq_rq_to_pdu(req);
enum dma_data_direction dma_dir = rq_data_dir(req) ?
DMA_TO_DEVICE : DMA_FROM_DEVICE;
if (iod->nents) {
/* P2PDMA requests do not need to be unmapped */
if (!is_pci_p2pdma_page(sg_page(iod->sg)))
dma_unmap_sg(dev->dev, iod->sg, iod->nents, dma_dir);
if (blk_integrity_rq(req))
dma_unmap_sg(dev->dev, &iod->meta_sg, 1, dma_dir);
}
nvme_free_iod(dev, req);
}
/*
* NOTE: ns is NULL when called on the admin queue.
*/