[PATCH] libata: implement PM EH actions

Implement two PM per-dev EH actions - ATA_EH_SUSPEND and
ATA_EH_RESUME.  Each action puts the target device into suspended mode
and resumes from it respectively.

Once a device is put to suspended mode, no EH operations other than
RESUME is allowed on the device.  The device will stay suspended till
it gets resumed and thus reset and revalidated.  To implement this, a
new device state helper - ata_dev_ready() - is implemented and used in
EH action implementations to make them operate only on attached &
running devices.

If all possible devices on a port are suspended, reset is skipped too.
This prevents spurious events including hotplug events from disrupting
suspended devices.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c
index f368536f8e91..ad5cac79627c 100644
--- a/drivers/scsi/libata-core.c
+++ b/drivers/scsi/libata-core.c
@@ -2146,7 +2146,7 @@ int ata_set_mode(struct ata_port *ap, struct ata_device **r_failed_dev)
                  * return error code and failing device on failure.
                  */
                 for (i = 0; i < ATA_MAX_DEVICES; i++) {
-                        if (ata_dev_enabled(&ap->device[i])) {
+                        if (ata_dev_ready(&ap->device[i])) {
                                 ap->ops->set_mode(ap);
                                 break;
                         }
@@ -2212,7 +2212,8 @@ int ata_set_mode(struct ata_port *ap, struct ata_device **r_failed_dev)
         for (i = 0; i < ATA_MAX_DEVICES; i++) {
                 dev = &ap->device[i];
 
-                if (!ata_dev_enabled(dev))
+                /* don't udpate suspended devices' xfer mode */
+                if (!ata_dev_ready(dev))
                         continue;
 
                 rc = ata_dev_set_mode(dev);