linux-kernel - [PATCH v3 5/7] libata: tell scsi layer device supports runtime power off

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Date:	Wed, 28 Mar 2012 14:22:00 +0800
From:	Lin Ming <ming.m.lin@...el.com>
To:	Zhang Rui <rui.zhang@...el.com>, Jeff Garzik <jgarzik@...ox.com>,
	Alan Stern <stern@...land.harvard.edu>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Tejun Heo <tj@...nel.org>,
	Aaron Lu <aaron.lu@....com>
Cc:	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org,
	linux-scsi@...r.kernel.org, linux-pm@...r.kernel.org,
	linux-acpi <linux-acpi@...r.kernel.org>
Subject: [PATCH v3 5/7] libata: tell scsi layer device supports runtime power off

If ATA device supports "Device Attention", then tell scsi layer that
the device supports runtime power off.

Acked-by: Aaron Lu <aaron.lu@....com>
Signed-off-by: Lin Ming <ming.m.lin@...el.com>
---
 drivers/ata/libata-scsi.c  |    2 ++
 include/scsi/scsi_device.h |    1 +
 2 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 231c3ec..0bfbe41 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -3445,6 +3445,8 @@ void ata_scsi_scan_host(struct ata_port *ap, int sync)
 				dev->sdev = sdev;
 				scsi_device_put(sdev);
 				ata_acpi_bind(dev);
+				if (dev->flags & ATA_DFLAG_DA)
+					sdev->power_off = 1;
 			} else {
 				dev->sdev = NULL;
 			}
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index 77273f2..0f69612 100644
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -151,6 +151,7 @@ struct scsi_device {
 	unsigned no_read_disc_info:1;	/* Avoid READ_DISC_INFO cmds */
 	unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */
 	unsigned is_visible:1;	/* is the device visible in sysfs */
+	unsigned power_off:1; /* Device supports runtime power off */
 
 	DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */
 	struct list_head event_list;	/* asserted events */
-- 
1.7.2.5

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