1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/scsi/atp870u.h b/drivers/scsi/atp870u.h
index 89f43af39cf..62bae64a01c 100644
--- a/drivers/scsi/atp870u.h
+++ b/drivers/scsi/atp870u.h
@@ -54,8 +54,9 @@ struct atp_unit
                 unsigned long tran_len;
                 unsigned long last_len;
                 unsigned char *prd_pos;
-                unsigned char *prd_table;
-                dma_addr_t prdaddr;
+                unsigned char *prd_table;       /* Kernel address of PRD table */
+                dma_addr_t prd_bus;             /* Bus address of PRD */
+                dma_addr_t prdaddr;             /* Dynamically updated in driver */
                 struct scsi_cmnd *curr_req;
         } id[2][16];
         struct Scsi_Host *host;