[SCSI] dc395x: "fix" virt_addr calculation on AUTO_REQSENSE

The patch below "fixes" calculation of the virt_addr for the AUTO_REQSENSE
case. I put "fixes" in quotes because the real fix would be to completely
remove it, but that's beyond the scope of this patch.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/scsi/dc395x.c b/drivers/scsi/dc395x.c
index c8a32cf47d73..cbf825263f3b 100644
--- a/drivers/scsi/dc395x.c
+++ b/drivers/scsi/dc395x.c
@@ -246,6 +246,7 @@ struct ScsiReqBlk {
          * total_xfer_length in xferred. These values are restored in
          * pci_unmap_srb_sense. This is the only place xferred is used.
          */
+        unsigned char *virt_addr_req;   /* Saved virtual address of the request buffer */
         u32 xferred;                    /* Saved copy of total_xfer_length */
 
         u16 state;
@@ -2017,7 +2018,7 @@ static void sg_update_list(struct ScsiReqBlk *srb, u32 left)
         sg_verify_length(srb);
 
         /* we need the corresponding virtual address */
-        if (!segment) {
+        if (!segment || (srb->flag & AUTO_REQSENSE)) {
                 srb->virt_addr += xferred;
                 return;
         }
@@ -3318,6 +3319,7 @@ static void pci_unmap_srb_sense(struct AdapterCtlBlk *acb,
             srb->segment_x[DC395x_MAX_SG_LISTENTRY - 1].address;
         srb->segment_x[0].length =
             srb->segment_x[DC395x_MAX_SG_LISTENTRY - 1].length;
+        srb->virt_addr = srb->virt_addr_req;
 }
 
 
@@ -3711,6 +3713,8 @@ static void request_sense(struct AdapterCtlBlk *acb, struct DeviceCtlBlk *dcb,
         srb->xferred = srb->total_xfer_length;
         /* srb->segment_x : a one entry of S/G list table */
         srb->total_xfer_length = sizeof(cmd->sense_buffer);
+        srb->virt_addr_req = srb->virt_addr;
+        srb->virt_addr = cmd->sense_buffer;
         srb->segment_x[0].length = sizeof(cmd->sense_buffer);
         /* Map sense buffer */
         srb->segment_x[0].address =