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nvmet-loop: use nr_phys_segments when map rq to sgl 

Use blk_rq_nr_phys_segments() instead of blk_rq_payload_bytes() to check
if a command contains data to me mapped.  This fixes the case where
a struct requests contains LBAs, but no data will actually be send,
e.g. the pending Write Zeroes support.

Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Chaitanya Kulkarni 2018-05-11 02:38:15 -04:00 committed by Christoph Hellwig
parent 17d78252ee
commit eb464833a2
1 changed files with 1 additions and 1 deletions
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2
drivers/nvme/target/loop.c
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@ -174,7 +174,7 @@ static blk_status_t nvme_loop_queue_rq(struct blk_mq_hw_ctx *hctx,
&queue->nvme_sq, &nvme_loop_ops))
return BLK_STS_OK;
if (blk_rq_payload_bytes(req)) {
if (blk_rq_nr_phys_segments(req)) {
iod->sg_table.sgl = iod->first_sgl;
if (sg_alloc_table_chained(&iod->sg_table,
blk_rq_nr_phys_segments(req),