[PATCH 01/10] libata: power down controller only on PMSG_SUSPEND

[Tejun Heo <htejun@gmail.com>]

The controller only needs to be powered down on PMSG_SUSPEND.  Skip
powering down for all other messages.  This makes disk suspend prep
cycle more efficient and helps controllers which have problems waking
up from D3hot without intervening power removal.

Signed-off-by: Tejun Heo <htejun@gmail.com>

---

 drivers/scsi/libata-core.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

85016ad86323924d10dc99ac9d7e9e5c0b967b8e
diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c
index 9a3bd15..51d3b4b 100644
--- a/drivers/scsi/libata-core.c
+++ b/drivers/scsi/libata-core.c
@@ -5661,7 +5661,10 @@ int ata_pci_device_suspend(struct pci_de
 {
 	pci_save_state(pdev);
 	pci_disable_device(pdev);
-	pci_set_power_state(pdev, PCI_D3hot);
+
+	if (state.event == PM_EVENT_SUSPEND)
+		pci_set_power_state(pdev, PCI_D3hot);
+
 	return 0;
 }
 
-- 
1.3.2