SATA: Blacklisting of systems that spin off disks during ACPI power off

Introduce new libata flags ATA_FLAG_NO_POWEROFF_SPINDOWN and
ATA_FLAG_NO_HIBERNATE_SPINDOWN that, if set, will prevent disks from
being spun off during system power off and hibernation, respectively
(to handle the hibernation case we need the new system state
SYSTEM_HIBERNATE_ENTER that can be checked against by libata, in
analogy with SYSTEM_POWER_OFF).

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index a1a6e62..3c4c5ae 100644 (file)
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -46,6 +46,7 @@
 #include <linux/libata.h>
 #include <linux/hdreg.h>
 #include <linux/uaccess.h>
+#include <linux/suspend.h>
 
 #include "libata.h"
 
@@ -1303,6 +1304,17 @@ static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc)
 
                tf->command = ATA_CMD_VERIFY;   /* READ VERIFY */
        } else {
+               /* Some odd clown BIOSen issue spindown on power off (ACPI S4
+                * or S5) causing some drives to spin up and down again.
+                */
+               if ((qc->ap->flags & ATA_FLAG_NO_POWEROFF_SPINDOWN) &&
+                   system_state == SYSTEM_POWER_OFF)
+                       goto skip;
+
+               if ((qc->ap->flags & ATA_FLAG_NO_HIBERNATE_SPINDOWN) &&
+                    system_entering_hibernation())
+                       goto skip;
+
                /* XXX: This is for backward compatibility, will be
                 * removed.  Read Documentation/feature-removal-schedule.txt
                 * for more info.
@@ -1326,8 +1338,7 @@ static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc)
                                scmd->scsi_done = qc->scsidone;
                                qc->scsidone = ata_delayed_done;
                        }
-                       scmd->result = SAM_STAT_GOOD;
-                       return 1;
+                       goto skip;
                }
 
                /* Issue ATA STANDBY IMMEDIATE command */
@@ -1343,10 +1354,13 @@ static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc)
 
        return 0;
 
-invalid_fld:
+ invalid_fld:
        ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
        /* "Invalid field in cbd" */
        return 1;
+ skip:
+       scmd->result = SAM_STAT_GOOD;
+       return 1;
 }
 
 

diff --git a/include/linux/libata.h b/include/linux/libata.h
index 2c6bd66..bca3ba2 100644 (file)
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -187,6 +187,8 @@ enum {
        ATA_FLAG_PIO_POLLING    = (1 << 9), /* use polling PIO if LLD
                                             * doesn't handle PIO interrupts */
        ATA_FLAG_NCQ            = (1 << 10), /* host supports NCQ */
+       ATA_FLAG_NO_POWEROFF_SPINDOWN = (1 << 11), /* don't spindown before poweroff */
+       ATA_FLAG_NO_HIBERNATE_SPINDOWN = (1 << 12), /* don't spindown before hibernation */
        ATA_FLAG_DEBUGMSG       = (1 << 13),
        ATA_FLAG_IGN_SIMPLEX    = (1 << 15), /* ignore SIMPLEX */
        ATA_FLAG_NO_IORDY       = (1 << 16), /* controller lacks iordy */