[PATCH] Make libata not powerdown drivers on PM_EVENT_FREEZE.

At the moment libata doesn't pass pm_message_t down ata_device_suspend.
This causes drives to be powered down when we just want a freeze,
causing unnecessary wear and tear. This patch gets pm_message_t passed
down so that it can be used to determine whether to power down the
drive.

Signed-off-by: Nigel Cunningham <nigel@suspend2.net>

 drivers/scsi/libata-core.c |    5 +++--
 drivers/scsi/libata-scsi.c |    4 ++--
 drivers/scsi/scsi_sysfs.c  |    2 +-
 include/linux/libata.h     |    4 ++--
 include/scsi/scsi_host.h   |    2 +-
 5 files changed, 9 insertions(+), 8 deletions(-)
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/scsi/libata-core.c

@@ -4336,14 +4336,15 @@ int ata_device_resume(struct ata_port *ap, struct ata_device *dev)
  *	Flush the cache on the drive, if appropriate, then issue a
  *	standbynow command.
  */
-int ata_device_suspend(struct ata_port *ap, struct ata_device *dev)
+int ata_device_suspend(struct ata_port *ap, struct ata_device *dev, pm_message_t state)
 {
 	if (!ata_dev_present(dev))
 		return 0;
 	if (dev->class == ATA_DEV_ATA)
 		ata_flush_cache(ap, dev);
 
-	ata_standby_drive(ap, dev);
+	if (state.event != PM_EVENT_FREEZE)
+		ata_standby_drive(ap, dev);
 	ap->flags |= ATA_FLAG_SUSPENDED;
 	return 0;
 }

drivers/scsi/libata-scsi.c

@@ -414,12 +414,12 @@ int ata_scsi_device_resume(struct scsi_device *sdev)
 	return ata_device_resume(ap, dev);
 }
 
-int ata_scsi_device_suspend(struct scsi_device *sdev)
+int ata_scsi_device_suspend(struct scsi_device *sdev, pm_message_t state)
 {
 	struct ata_port *ap = (struct ata_port *) &sdev->host->hostdata[0];
 	struct ata_device *dev = &ap->device[sdev->id];
 
-	return ata_device_suspend(ap, dev);
+	return ata_device_suspend(ap, dev, state);
 }
 
 /**

drivers/scsi/scsi_sysfs.c

@@ -286,7 +286,7 @@ static int scsi_bus_suspend(struct device * dev, pm_message_t state)
 		return err;
 
 	if (sht->suspend)
-		err = sht->suspend(sdev);
+		err = sht->suspend(sdev, state);
 
 	return err;
 }

include/linux/libata.h

@@ -520,9 +520,9 @@ extern void ata_eh_qc_retry(struct ata_queued_cmd *qc);
 extern int ata_scsi_release(struct Scsi_Host *host);
 extern unsigned int ata_host_intr(struct ata_port *ap, struct ata_queued_cmd *qc);
 extern int ata_scsi_device_resume(struct scsi_device *);
-extern int ata_scsi_device_suspend(struct scsi_device *);
+extern int ata_scsi_device_suspend(struct scsi_device *, pm_message_t state);
 extern int ata_device_resume(struct ata_port *, struct ata_device *);
-extern int ata_device_suspend(struct ata_port *, struct ata_device *);
+extern int ata_device_suspend(struct ata_port *, struct ata_device *, pm_message_t state);
 extern int ata_ratelimit(void);
 extern unsigned int ata_busy_sleep(struct ata_port *ap,
 				   unsigned long timeout_pat,

include/scsi/scsi_host.h

@@ -286,7 +286,7 @@ struct scsi_host_template {
 	 * suspend support
 	 */
 	int (*resume)(struct scsi_device *);
-	int (*suspend)(struct scsi_device *);
+	int (*suspend)(struct scsi_device *, pm_message_t state);
 
 	/*
 	 * Name of proc directory