libata: track SLEEP state and issue SRST to wake it up

ATA devices in SLEEP mode don't respond to any commands.  SRST is
necessary to wake it up.  Till now, when a command is issued to a
device in SLEEP mode, the command times out, which makes EH reset the
device and retry the command after that, causing a long delay.

This patch makes libata track SLEEP state and issue SRST automatically
if a command is about to be issued to a device in SLEEP.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Cc: Bruce Allen <ballen@gravity.phys.uwm.edu>
Cc: Andrew Paprocki <andrew@ishiboo.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 12 insertions, 0 deletions

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 5aedd1af06e6..50ae20101d10 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -5630,6 +5630,10 @@ void ata_qc_complete(struct ata_queued_cmd *qc)
                         ehi->dev_action[dev->devno] |= ATA_EH_REVALIDATE;
                         ata_port_schedule_eh(ap);
                         break;
+
+                case ATA_CMD_SLEEP:
+                        dev->flags |= ATA_DFLAG_SLEEPING;
+                        break;
                 }
 
                 __ata_qc_complete(qc);
@@ -5769,6 +5773,14 @@ void ata_qc_issue(struct ata_queued_cmd *qc)
                 qc->flags &= ~ATA_QCFLAG_DMAMAP;
         }
 
+        /* if device is sleeping, schedule softreset and abort the link */
+        if (unlikely(qc->dev->flags & ATA_DFLAG_SLEEPING)) {
+                link->eh_info.action |= ATA_EH_SOFTRESET;
+                ata_ehi_push_desc(&link->eh_info, "waking up from sleep");
+                ata_link_abort(link);
+                return;
+        }
+
         ap->ops->qc_prep(qc);
 
         qc->err_mask |= ap->ops->qc_issue(qc);