hpsa: correct off-by-one sizing of chained SG block

Correct the size calculation of the chained SG block

Signed-off-by: Don Brace <don.brace@pmcs.com>
Signed-off-by: Webb Scales <webbnh@hp.com>
Reviewed-by: Stephen M. Cameron <stephenmcameron@gmail.com>
Reviewed-by: Don Brace <don.brace@pmcs.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
index f0984c62bec3..4ca94a5373d3 100644
--- a/drivers/scsi/hpsa.c
+++ b/drivers/scsi/hpsa.c
@@ -6321,11 +6321,11 @@ static void hpsa_find_board_params(struct ctlr_info *h)
         h->max_cmd_sg_entries = 31;
         if (h->maxsgentries > 512) {
                 h->max_cmd_sg_entries = 32;
-                h->chainsize = h->maxsgentries - h->max_cmd_sg_entries + 1;
+                h->chainsize = h->maxsgentries - h->max_cmd_sg_entries;
                 h->maxsgentries--; /* save one for chain pointer */
         } else {
-                h->maxsgentries = 31; /* default to traditional values */
                 h->chainsize = 0;
+                h->maxsgentries = 31; /* default to traditional values */
         }
 
         /* Find out what task management functions are supported and cache */