[SCSI] tgt: set the data length properly

scsi_tgt uses REQ_TYPE_BLOCK_PC so scsi_init_io doesn't set the length
for us. scsi_tgt needs to do it by itself.
Signed-off-by: NFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: NJames Bottomley <James.Bottomley@HansenPartnership.com>

drivers/scsi/scsi_tgt_lib.c

@@ -381,6 +381,11 @@ static int scsi_map_user_pages(struct scsi_tgt_cmd *tcmd, struct scsi_cmnd *cmd,
 		scsi_release_buffers(cmd);
 		goto unmap_rq;
 	}
+	/*
+	 * we use REQ_TYPE_BLOCK_PC so scsi_init_io doesn't set the
+	 * length for us.
+	 */
+	cmd->sdb.length = rq->data_len;
 
 	return 0;