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

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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>
This commit is contained in:
Tejun Heo
2007-10-25 18:30:36 +09:00
committed by Jeff Garzik
parent 4dbfa39b6c
commit 054a5fbace
4 changed files with 17 additions and 1 deletions
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12
drivers/ata/libata-core.c
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@@ -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);