[patch 32/46] SCSI: dpt_i2o: fix transferred data length for scsi_set_resid()

[Greg KH <gregkh@suse.de>]

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2.6.27-stable review patch.  If anyone has any objections, please let us know.

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From: Miquel van Smoorenburg <mikevs@xs4all.net>

commit df81d2371aeca0f7474f197a3090830899016e39 upstream.

dpt_i2o.c::adpt_i2o_to_scsi() reads the value at (reply+5) which
should contain the length in bytes of the transferred data. This
would be correct if reply was a u32 *. However it is a void * here,
so we need to read the value at (reply+20) instead.

The value at (reply+5) is usually 0xff0000, which is apparently
'large enough' and didn't cause any trouble until 2.6.27 where

commit 427e59f09fdba387547106de7bab980b7fff77be
Author: James Bottomley <James.Bottomley@HansenPartnership.com>
Date:   Sat Mar 8 18:24:17 2008 -0600

    [SCSI] make use of the residue value

caused this to become visible through e.g. iostat -x .

Signed-off-by: Miquel van Smoorenburg <mikevs@xs4all.net>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
 drivers/scsi/dpt_i2o.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/scsi/dpt_i2o.c
+++ b/drivers/scsi/dpt_i2o.c
@@ -2445,7 +2445,7 @@ static s32 adpt_i2o_to_scsi(void __iomem
 	hba_status = detailed_status >> 8;
 
 	// calculate resid for sg 
-	scsi_set_resid(cmd, scsi_bufflen(cmd) - readl(reply+5));
+	scsi_set_resid(cmd, scsi_bufflen(cmd) - readl(reply+20));
 
 	pHba = (adpt_hba*) cmd->device->host->hostdata[0];
 
@@ -2456,7 +2456,7 @@ static s32 adpt_i2o_to_scsi(void __iomem
 		case I2O_SCSI_DSC_SUCCESS:
 			cmd->result = (DID_OK << 16);
 			// handle underflow
-			if(readl(reply+5) < cmd->underflow ) {
+			if (readl(reply+20) < cmd->underflow) {
 				cmd->result = (DID_ERROR <<16);
 				printk(KERN_WARNING"%s: SCSI CMD underflow\n",pHba->name);
 			}

--