[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>
diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
index 15842b1..ea7f3a4 100644
--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -263,9 +263,40 @@
return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
}
+static int scsi_bus_suspend(struct device * dev, pm_message_t state)
+{
+ struct scsi_device *sdev = to_scsi_device(dev);
+ struct scsi_host_template *sht = sdev->host->hostt;
+ int err;
+
+ err = scsi_device_quiesce(sdev);
+ if (err)
+ return err;
+
+ if (sht->suspend)
+ err = sht->suspend(sdev);
+
+ return err;
+}
+
+static int scsi_bus_resume(struct device * dev)
+{
+ struct scsi_device *sdev = to_scsi_device(dev);
+ struct scsi_host_template *sht = sdev->host->hostt;
+ int err = 0;
+
+ if (sht->resume)
+ err = sht->resume(sdev);
+
+ scsi_device_resume(sdev);
+ return err;
+}
+
struct bus_type scsi_bus_type = {
.name = "scsi",
.match = scsi_bus_match,
+ .suspend = scsi_bus_suspend,
+ .resume = scsi_bus_resume,
};
int scsi_sysfs_register(void)