[PATCH] NCR5380: Call scsi_set_resid() on command completion

[Finn Thain <fthain@telegraphics.com.au>]

Most NCR5380 drivers calculate the residual for every data transfer.
(A few drivers just set it to zero.) Pass this quantity back to the
scsi mid-layer on command completion.

Cc: Michael Schmitz <schmitzmic@gmail.com>
Cc: Ondrej Zary <linux@zary.sk>
Reviewed-and-tested-by: Michael Schmitz <schmitzmic@gmail.com>
Tested-by: Ondrej Zary <linux@zary.sk>
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
---
 drivers/scsi/NCR5380.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/scsi/NCR5380.c b/drivers/scsi/NCR5380.c
index d4401c768a0c..3ea2557e7938 100644
--- a/drivers/scsi/NCR5380.c
+++ b/drivers/scsi/NCR5380.c
@@ -175,6 +175,19 @@ static inline void advance_sg_buffer(struct scsi_cmnd *cmd)
 	}
 }
 
+static inline void set_resid_from_SCp(struct scsi_cmnd *cmd)
+{
+	int resid = cmd->SCp.this_residual;
+	struct scatterlist *s = cmd->SCp.buffer;
+
+	if (s)
+		while (!sg_is_last(s)) {
+			s = sg_next(s);
+			resid += s->length;
+		}
+	scsi_set_resid(cmd, resid);
+}
+
 /**
  * NCR5380_poll_politely2 - wait for two chip register values
  * @hostdata: host private data
@@ -1807,6 +1820,8 @@ static void NCR5380_information_transfer(struct Scsi_Host *instance)
 					cmd->result |= cmd->SCp.Status;
 					cmd->result |= cmd->SCp.Message << 8;
 
+					set_resid_from_SCp(cmd);
+
 					if (cmd->cmnd[0] == REQUEST_SENSE)
 						complete_cmd(instance, cmd);
 					else {
-- 
2.23.0