From 56fd18eb46c45c5441a6b9b54c1b98fd59b90aef Mon Sep 17 00:00:00 2001
From: Lin Ming <ming.m.lin@intel.com>
Date: Mon, 5 Dec 2011 09:20:25 +0800
Subject: [PATCH] --- yaml --- r: 282110 b: refs/heads/master c:
 286405167e815adc4ae0132214246a350b0208bc h: refs/heads/master v: v3

---
 [refs]                       |  2 +-
 trunk/drivers/scsi/scsi_pm.c | 16 +++++++++++++++-
 2 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/[refs] b/[refs]
index d2a9f561c2ff..895b98cae06a 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: ae0751ffc77e7f21629970fdab5528c573e637f8
+refs/heads/master: 286405167e815adc4ae0132214246a350b0208bc
diff --git a/trunk/drivers/scsi/scsi_pm.c b/trunk/drivers/scsi/scsi_pm.c
index d329f8b12e2b..a633076e5622 100644
--- a/trunk/drivers/scsi/scsi_pm.c
+++ b/trunk/drivers/scsi/scsi_pm.c
@@ -49,8 +49,22 @@ static int scsi_bus_suspend_common(struct device *dev, pm_message_t msg)
 {
 	int err = 0;
 
-	if (scsi_is_sdev_device(dev))
+	if (scsi_is_sdev_device(dev)) {
+		/*
+		 * sd is the only high-level SCSI driver to implement runtime
+		 * PM, and sd treats runtime suspend, system suspend, and
+		 * system hibernate identically (but not system freeze).
+		 */
+		if (pm_runtime_suspended(dev)) {
+			if (msg.event == PM_EVENT_SUSPEND ||
+			    msg.event == PM_EVENT_HIBERNATE)
+				return 0;	/* already suspended */
+
+			/* wake up device so that FREEZE will succeed */
+			pm_runtime_resume(dev);
+		}
 		err = scsi_dev_type_suspend(dev, msg);
+	}
 	return err;
 }