linux-kernel - [PATCH v3 2/7] scsi: pm: use autosuspend if device supports it

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Message-ID: <1343297129-28174-3-git-send-email-aaron.lu@amd.com>
Date:	Thu, 26 Jul 2012 18:05:24 +0800
From:	Aaron Lu <aaron.lu@....com>
To:	James Bottomley <James.Bottomley@...senPartnership.com>,
	Alan Stern <stern@...land.harvard.edu>
CC:	Jeff Garzik <jgarzik@...ox.com>, Lin Ming <minggr@...il.com>,
	Jeff Wu <jeff.wu@....com>, <linux-kernel@...r.kernel.org>,
	<linux-pm@...r.kernel.org>, <linux-scsi@...r.kernel.org>,
	<linux-ide@...r.kernel.org>, Aaron Lu <aaron.lwe@...il.com>,
	Aaron Lu <aaron.lu@....com>
Subject: [PATCH v3 2/7] scsi: pm: use autosuspend if device supports it

If the device is using autosuspend, when scsi_autopm_put_device is
called for it, use autosuspend runtime pm calls instead of the sync
call.

Signed-off-by: Aaron Lu <aaron.lu@....com>
---
 drivers/scsi/scsi_pm.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/scsi_pm.c b/drivers/scsi/scsi_pm.c
index dc0ad85..7c93723 100644
--- a/drivers/scsi/scsi_pm.c
+++ b/drivers/scsi/scsi_pm.c
@@ -197,7 +197,13 @@ EXPORT_SYMBOL_GPL(scsi_autopm_get_device);
 
 void scsi_autopm_put_device(struct scsi_device *sdev)
 {
-	pm_runtime_put_sync(&sdev->sdev_gendev);
+	if (sdev->sdev_gendev.power.use_autosuspend) {
+		pm_runtime_mark_last_busy(&sdev->sdev_gendev);
+		pm_runtime_put_autosuspend(&sdev->sdev_gendev);
+	} else {
+		pm_runtime_put_sync(&sdev->sdev_gendev);
+	}
+
 }
 EXPORT_SYMBOL_GPL(scsi_autopm_put_device);
 
-- 
1.7.11.3


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