[PATCH] Make libata not powerdown drivers on PM_EVENT_FREEZE.

[Nigel Cunningham <ncunningham@cyclades.com>]

Hi.

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.

Prepared against git at the time of writing. Please apply.

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

 drivers/scsi/libata-core.c |    5 +++--
 drivers/scsi/libata-scsi.c |    2 +-
 drivers/scsi/scsi_sysfs.c  |    2 +-
 include/linux/libata.h     |    4 ++--
 include/scsi/scsi_host.h   |    2 +-
 5 files changed, 8 insertions(+), 7 deletions(-)
diff -ruNp 9904-libata-freeze.patch-old/drivers/scsi/libata-core.c 9904-libata-freeze.patch-new/drivers/scsi/libata-core.c
--- 9904-libata-freeze.patch-old/drivers/scsi/libata-core.c	2006-03-23 21:49:06.000000000 +1000
+++ 9904-libata-freeze.patch-new/drivers/scsi/libata-core.c	2006-03-23 21:16:55.000000000 +1000
@@ -4506,14 +4506,15 @@ int ata_device_resume(struct ata_port *a
  *	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;
 }
diff -ruNp 9904-libata-freeze.patch-old/drivers/scsi/libata-scsi.c 9904-libata-freeze.patch-new/drivers/scsi/libata-scsi.c
--- 9904-libata-freeze.patch-old/drivers/scsi/libata-scsi.c	2006-03-23 21:16:22.000000000 +1000
+++ 9904-libata-freeze.patch-new/drivers/scsi/libata-scsi.c	2006-03-23 21:24:06.000000000 +1000
@@ -419,7 +419,7 @@ int ata_scsi_device_suspend(struct scsi_
 	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);
 }
 
 /**
diff -ruNp 9904-libata-freeze.patch-old/drivers/scsi/scsi_sysfs.c 9904-libata-freeze.patch-new/drivers/scsi/scsi_sysfs.c
--- 9904-libata-freeze.patch-old/drivers/scsi/scsi_sysfs.c	2006-03-23 14:49:53.000000000 +1000
+++ 9904-libata-freeze.patch-new/drivers/scsi/scsi_sysfs.c	2006-03-23 21:08:01.000000000 +1000
@@ -286,7 +286,7 @@ static int scsi_bus_suspend(struct devic
 		return err;
 
 	if (sht->suspend)
-		err = sht->suspend(sdev);
+		err = sht->suspend(sdev, state);
 
 	return err;
 }
diff -ruNp 9904-libata-freeze.patch-old/include/linux/libata.h 9904-libata-freeze.patch-new/include/linux/libata.h
--- 9904-libata-freeze.patch-old/include/linux/libata.h	2006-03-23 14:50:10.000000000 +1000
+++ 9904-libata-freeze.patch-new/include/linux/libata.h	2006-03-23 21:23:31.000000000 +1000
@@ -515,9 +515,9 @@ extern void ata_eh_qc_retry(struct ata_q
 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,
diff -ruNp 9904-libata-freeze.patch-old/include/scsi/scsi_host.h 9904-libata-freeze.patch-new/include/scsi/scsi_host.h
--- 9904-libata-freeze.patch-old/include/scsi/scsi_host.h	2006-03-23 14:50:12.000000000 +1000
+++ 9904-libata-freeze.patch-new/include/scsi/scsi_host.h	2006-03-23 21:08:57.000000000 +1000
@@ -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

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