i2c: Fix checks which cause legacy suspend to never get called

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@ti.com>
Acked-by: Rafael J. Wysocki <rjw@sisk.pl>
Cc: Ben Dooks <ben-linux@fluff.org>
Cc: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: Kevin Hilman <khilman@deeprootsystems.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

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);
 }
@@ -223,11 +224,12 @@ 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);
 }
@@ -236,11 +238,12 @@ 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);
 }
@@ -249,11 +252,12 @@ 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);
 }