[PATCH] Suspend support for libata

This patch adds suspend patch to libata, and ata_piix in particular. For
most low level drivers, they should just need to add the 4 hooks to
work. As I can only test ata_piix, I didn't enable it for more
though.

Suspend support is the single most important feature on a notebook, and
most new notebooks have sata drives. It's quite embarrassing that we
_still_ do not support this. Right now, it's perfectly possible to
suspend the drive in mid-transfer.

Signed-off-by: Jens Axboe <axboe@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 16 insertions, 0 deletions

diff --git a/drivers/scsi/libata-scsi.c b/drivers/scsi/libata-scsi.c
index e0439be4b57..c1ebede14a4 100644
--- a/drivers/scsi/libata-scsi.c
+++ b/drivers/scsi/libata-scsi.c
@@ -396,6 +396,22 @@ void ata_dump_status(unsigned id, struct ata_taskfile *tf)
         }
 }
 
+int ata_scsi_device_resume(struct scsi_device *sdev)
+{
+        struct ata_port *ap = (struct ata_port *) &sdev->host->hostdata[0];
+        struct ata_device *dev = &ap->device[sdev->id];
+
+        return ata_device_resume(ap, dev);
+}
+
+int ata_scsi_device_suspend(struct scsi_device *sdev)
+{
+        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);
+}
+
 /**
  *      ata_to_sense_error - convert ATA error to SCSI error
  *      @id: ATA device number