[PATCH 1/2] ieee1394: sbp2: don't prefer MODE SENSE 10

[Stefan Richter]

In the old days, sbp2 used to coerce all MODE SENSE commands into the
10 bytes version.  When all command set conversions were removed from
sbp2 several months ago, sdev->use_10_for_ms = 1 was added.  Meaning,
higher SCSI layers preferred the 10 bytes version but would try the 6
bytes version if the former failed.

Recently, a problem with the 10 bytes version was discovered.  An Initio
INIC-1530 firmware accepted the 10 bytes version but replied with bogus
data, showing the HDD incorrectly as write-protected.  Since RBC
actually mandates MODE SENSE (6), I checked which version was sent by
Windows XP and Mac OS X 10.3 to an SBP-2 target hosted by Linux --- it
was the 6 bytes version.  (Exception: OS X sent the 10 bytes version to
an MMC target.  RBC and SBC got MODE SENSE (6).)

Therefore, drop the use_10_for_ms flag from sbp2.  Now the upper layers
will try MODE SENSE (6) before MODE SENSE (10) on all SBP-2 devices.

Signed-off-by: Stefan Richter <stefanr@xxxxxxxxxxxxxxxxx>
---
Long story, short patch.  This supercedes patch "ieee1394: sbp2:
workaround for write protect bit of Initio firmware".

Index: linux/drivers/ieee1394/sbp2.c
===================================================================
--- linux.orig/drivers/ieee1394/sbp2.c	2006-09-06 23:51:42.000000000 +0200
+++ linux/drivers/ieee1394/sbp2.c	2006-09-07 00:35:09.000000000 +0200
@@ -2529,7 +2529,6 @@ static int sbp2scsi_slave_configure(stru
 
 	blk_queue_dma_alignment(sdev->request_queue, (512 - 1));
 	sdev->use_10_for_rw = 1;
-	sdev->use_10_for_ms = 1;
 
 	if (sdev->type == TYPE_DISK &&
 	    scsi_id->workarounds & SBP2_WORKAROUND_MODE_SENSE_8)


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