[PATCH] I2C: runtime: Fix checks which make legacy suspend to never get called

[Rajendra Nayak <rnayak-l0cyMroinI0@public.gmane.org>]

For devices which are not adapted to runtime PM a call to
pm_runtime_suspended always returns true.

Hence the pm_runtime_suspended checks below prevent legacy
suspend from getting called.

So do a pm_runtime_suspended check only for devices with a
dev_pm_ops populated (which hence do not rely on the legacy
suspend)

Signed-off-by: Rajendra Nayak <rnayak-l0cyMroinI0@public.gmane.org>
Cc: Rafael J. Wysocki <rjw-KKrjLPT3xs0@public.gmane.org>
Cc: Ben Dooks <ben-linux-elnMNo+KYs3YtjvyW6yDsg@public.gmane.org>
Cc: Mark Brown <broonie-yzvPICuk2AATkU/dhu1WVueM+bqZidxxQQ4Iyu8u01E@public.gmane.org>
Cc: Jean Delvare <khali-PUYAD+kWke1g9hUCZPvPmw@public.gmane.org>
Cc: Kevin Hilman <khilman-1D3HCaltpLuhEniVeURVKkEOCMrvLtNR@public.gmane.org>
---
 drivers/i2c/i2c-core.c |   44 ++++++++++++++++++++++++--------------------
 1 files changed, 24 insertions(+), 20 deletions(-)

diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index 6649176..712086f 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -197,11 +197,12 @@ static int i2c_device_pm_suspend(struct device *dev)
 {
 	const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 
-	if (pm_runtime_suspended(dev))
-		return 0;
-
-	if (pm)
-		return pm->suspend ? pm->suspend(dev) : 0;
+	if (pm) {
+		if (pm_runtime_suspended(dev))
+			return 0;
+		else
+			return pm->suspend ? pm->suspend(dev) : 0;
+	}
 
 	return i2c_legacy_suspend(dev, PMSG_SUSPEND);
 }
@@ -229,11 +230,12 @@ static int i2c_device_pm_freeze(struct device *dev)
 {
 	const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 
-	if (pm_runtime_suspended(dev))
-		return 0;
-
-	if (pm)
-		return pm->freeze ? pm->freeze(dev) : 0;
+	if (pm) {
+		if (pm_runtime_suspended(dev))
+			return 0;
+		else
+			return pm->freeze ? pm->freeze(dev) : 0;
+	}
 
 	return i2c_legacy_suspend(dev, PMSG_FREEZE);
 }
@@ -242,11 +244,12 @@ static int i2c_device_pm_thaw(struct device *dev)
 {
 	const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 
-	if (pm_runtime_suspended(dev))
-		return 0;
-
-	if (pm)
-		return pm->thaw ? pm->thaw(dev) : 0;
+	if (pm) {
+		if (pm_runtime_suspended(dev))
+			return 0;
+		else
+			return pm->thaw ? pm->thaw(dev) : 0;
+	}
 
 	return i2c_legacy_resume(dev);
 }
@@ -255,11 +258,12 @@ static int i2c_device_pm_poweroff(struct device *dev)
 {
 	const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 
-	if (pm_runtime_suspended(dev))
-		return 0;
-
-	if (pm)
-		return pm->poweroff ? pm->poweroff(dev) : 0;
+	if (pm) {
+		if (pm_runtime_suspended(dev))
+			return 0;
+		else
+			return pm->poweroff ? pm->poweroff(dev) : 0;
+	}
 
 	return i2c_legacy_suspend(dev, PMSG_HIBERNATE);
 }
-- 
1.7.0.4