libata: fix translation for START STOP UNIT

libata's SCSI translation for the SCSI START STOP UNIT command with the
START bit clear (i.e.  stopping the drive) appears to be incorrect.  It
sends an ATA STANDBY command with the time period set to 0, which the code
comment says means "now", but the ATA standard says this means disable the
standby timer, which effectively does nothing.  Change this to issue a
STANDBY IMMEDIATE command which will actually spin the drive down.  The SAT
(SCSI/ATA Translation) standard revision 9 concurs with this choice.

Signed-off-by: Robert Hancock <hancockr@shaw.ca>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index d151cf057ef2f1e458df00e717ea8d999dbfe601..73902d335767b4a8404d2e5b7fb1b3503ddd9798 100644 (file)
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -1022,11 +1022,10 @@ static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc)
                }
 
                tf->command = ATA_CMD_VERIFY;   /* READ VERIFY */
-       } else {
-               tf->nsect = 0;  /* time period value (0 implies now) */
-               tf->command = ATA_CMD_STANDBY;
-               /* Consider: ATA STANDBY IMMEDIATE command */
-       }
+       } else
+               /* Issue ATA STANDBY IMMEDIATE command */
+               tf->command = ATA_CMD_STANDBYNOW1;
+
        /*
         * Standby and Idle condition timers could be implemented but that
         * would require libata to implement the Power condition mode page