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nvme-rdma: use nr_phys_segments when map rq to sgl

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Use blk_rq_nr_phys_segments() instead of blk_rq_payload_bytes() to check
if a command contains data to be mapped.  This fixes the case where
a struct request contains LBAs, but it has no payload, such as
Write Zeroes support.

Fixes: 6e02318eae ("nvme: add support for the Write Zeroes command")
Reported-by: Ming Lei <tom.leiming@gmail.com>
Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Tested-by: Ming Lei <tom.leiming@gmail.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Chaitanya Kulkarni 2019-02-20 20:13:34 -08:00 committed by Christoph Hellwig
parent 77141dc6ce
commit 34e08191b1
1 changed files with 2 additions and 2 deletions
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4
drivers/nvme/host/rdma.c
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@ -1142,7 +1142,7 @@ static void nvme_rdma_unmap_data(struct nvme_rdma_queue *queue,
struct nvme_rdma_device *dev = queue->device;
struct ib_device *ibdev = dev->dev;
if (!blk_rq_payload_bytes(rq))
if (!blk_rq_nr_phys_segments(rq))
return;
if (req->mr) {
@ -1265,7 +1265,7 @@ static int nvme_rdma_map_data(struct nvme_rdma_queue *queue,
c->common.flags |= NVME_CMD_SGL_METABUF;
if (!blk_rq_payload_bytes(rq))
if (!blk_rq_nr_phys_segments(rq))
return nvme_rdma_set_sg_null(c);
req->sg_table.sgl = req->first_sgl;