On 03/31/2016 11:05 AM, Chanwoo Choi wrote:

+static int exynos_bus_target(struct device *dev, unsigned long *freq, u32 flags)
+{

+	new_opp = devfreq_recommended_opp(dev, freq, flags);
+	if (IS_ERR_OR_NULL(new_opp)) {
+		dev_err(dev, "failed to get recommed opp instance\n");

s/recommed/recommended/

+		rcu_read_unlock();
+		return PTR_ERR(new_opp);
+	}

+}

+static int exynos_bus_probe(struct platform_device *pdev)
+{

+	bus->devfreq = devm_devfreq_add_device(dev, profile, "simple_ondemand",
+						ondemand_data);
+	if (IS_ERR_OR_NULL(bus->devfreq)) {
+		dev_err(dev, "failed to add devfreq device\n");
+		return  PTR_ERR(bus->devfreq);
+	}

+}

You should use IS_ERR() instead of IS_ERR_OR_NULL(), since functions
of which the return value is being tested return only ERR_PTR() values.
IS_ERR_OR_NULL() suggest NULL values are possible and then constructs
like
	if (IS_ERR_OR_NULL(result))
		return PTR_ERR(result);

are not correct anyway.

-- 
Regards,
Sylwester