nvmet: ignore discard return value

__blkdev_issue_discard() always returns 0, making the error checking
in nvmet_bdev_discard_range() dead code.

Kill the function nvmet_bdev_discard_range() and call
__blkdev_issue_discard() directly from nvmet_bdev_execute_discard(),
since no error handling is needed anymore for __blkdev_issue_discard()
call.

Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Chaitanya Kulkarni <kch@nvidia.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Author: Chaitanya Kulkarni

drivers/nvme/target/io-cmd-bdev.c

@@ -363,39 +363,25 @@ u16 nvmet_bdev_flush(struct nvmet_req *req)
 	return 0;
 }
 
-static u16 nvmet_bdev_discard_range(struct nvmet_req *req,
-		struct nvme_dsm_range *range, struct bio **bio)
-{
-	struct nvmet_ns *ns = req->ns;
-	int ret;
-
-	ret = __blkdev_issue_discard(ns->bdev,
-			nvmet_lba_to_sect(ns, range->slba),
-			le32_to_cpu(range->nlb) << (ns->blksize_shift - 9),
-			GFP_KERNEL, bio);
-	if (ret && ret != -EOPNOTSUPP) {
-		req->error_slba = le64_to_cpu(range->slba);
-		return errno_to_nvme_status(req, ret);
-	}
-	return NVME_SC_SUCCESS;
-}
-
 static void nvmet_bdev_execute_discard(struct nvmet_req *req)
 {
+	struct nvmet_ns *ns = req->ns;
 	struct nvme_dsm_range range;
 	struct bio *bio = NULL;
+	sector_t nr_sects;
 	int i;
-	u16 status;
+	u16 status = NVME_SC_SUCCESS;
 
 	for (i = 0; i <= le32_to_cpu(req->cmd->dsm.nr); i++) {
 		status = nvmet_copy_from_sgl(req, i * sizeof(range), &range,
 				sizeof(range));
 		if (status)
 			break;
 
-		status = nvmet_bdev_discard_range(req, &range, &bio);
-		if (status)
-			break;
+		nr_sects = le32_to_cpu(range.nlb) << (ns->blksize_shift - 9);
+		__blkdev_issue_discard(ns->bdev,
+				nvmet_lba_to_sect(ns, range.slba), nr_sects,
+				GFP_KERNEL, &bio);
 	}
 
 	if (bio) {