ieee1394: sbp2: don't prefer MODE SENSE 10

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@s5r6.in-berlin.de>

diff --git a/drivers/ieee1394/sbp2.c b/drivers/ieee1394/sbp2.c
index 017259cc34f3a692216f2553e82fae0f8a927ec8..f192596329e363f20d6f2269ffe46014b7454277 100644 (file)
--- a/drivers/ieee1394/sbp2.c
+++ b/drivers/ieee1394/sbp2.c
@@ -2528,7 +2528,6 @@ static int sbp2scsi_slave_configure(struct scsi_device *sdev)
 
        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)