diff --git a/drivers/devfreq/exynos-bus.c b/drivers/devfreq/exynos-bus.c
index 0b557df63666..3eb6a043284a 100644
--- a/drivers/devfreq/exynos-bus.c
+++ b/drivers/devfreq/exynos-bus.c
@@ -15,11 +15,10 @@
 #include <linux/device.h>
 #include <linux/export.h>
 #include <linux/module.h>
-#include <linux/of_device.h>
+#include <linux/of.h>
 #include <linux/pm_opp.h>
 #include <linux/platform_device.h>
 #include <linux/regulator/consumer.h>
-#include <linux/slab.h>
 
 #define DEFAULT_SATURATION_RATIO	40
 
@@ -178,7 +177,7 @@ static int exynos_bus_parent_parse_of(struct device_node *np,
 	struct device *dev = bus->dev;
 	struct opp_table *opp_table;
 	const char *vdd = "vdd";
-	int i, ret, count, size;
+	int i, ret, count;
 
 	opp_table = dev_pm_opp_set_regulators(dev, &vdd, 1);
 	if (IS_ERR(opp_table)) {
@@ -201,8 +200,7 @@ static int exynos_bus_parent_parse_of(struct device_node *np,
 	}
 	bus->edev_count = count;
 
-	size = sizeof(*bus->edev) * count;
-	bus->edev = devm_kzalloc(dev, size, GFP_KERNEL);
+	bus->edev = devm_kcalloc(dev, count, sizeof(*bus->edev), GFP_KERNEL);
 	if (!bus->edev) {
 		ret = -ENOMEM;
 		goto err_regulator;
@@ -301,10 +299,9 @@ static int exynos_bus_profile_init(struct exynos_bus *bus,
 	profile->exit = exynos_bus_exit;
 
 	ondemand_data = devm_kzalloc(dev, sizeof(*ondemand_data), GFP_KERNEL);
-	if (!ondemand_data) {
-		ret = -ENOMEM;
-		goto err;
-	}
+	if (!ondemand_data)
+		return -ENOMEM;
+
 	ondemand_data->upthreshold = 40;
 	ondemand_data->downdifferential = 5;
 
@@ -314,15 +311,14 @@ static int exynos_bus_profile_init(struct exynos_bus *bus,
 						ondemand_data);
 	if (IS_ERR(bus->devfreq)) {
 		dev_err(dev, "failed to add devfreq device\n");
-		ret = PTR_ERR(bus->devfreq);
-		goto err;
+		return PTR_ERR(bus->devfreq);
 	}
 
 	/* Register opp_notifier to catch the change of OPP  */
 	ret = devm_devfreq_register_opp_notifier(dev, bus->devfreq);
 	if (ret < 0) {
 		dev_err(dev, "failed to register opp notifier\n");
-		goto err;
+		return ret;
 	}
 
 	/*
@@ -332,17 +328,16 @@ static int exynos_bus_profile_init(struct exynos_bus *bus,
 	ret = exynos_bus_enable_edev(bus);
 	if (ret < 0) {
 		dev_err(dev, "failed to enable devfreq-event devices\n");
-		goto err;
+		return ret;
 	}
 
 	ret = exynos_bus_set_event(bus);
 	if (ret < 0) {
 		dev_err(dev, "failed to set event to devfreq-event devices\n");
-		goto err;
+		return ret;
 	}
 
-err:
-	return ret;
+	return 0;
 }
 
 static int exynos_bus_profile_init_passive(struct exynos_bus *bus,
@@ -351,7 +346,6 @@ static int exynos_bus_profile_init_passive(struct exynos_bus *bus,
 	struct device *dev = bus->dev;
 	struct devfreq_passive_data *passive_data;
 	struct devfreq *parent_devfreq;
-	int ret = 0;
 
 	/* Initialize the struct profile and governor data for passive device */
 	profile->target = exynos_bus_target;
@@ -359,30 +353,26 @@ static int exynos_bus_profile_init_passive(struct exynos_bus *bus,
 
 	/* Get the instance of parent devfreq device */
 	parent_devfreq = devfreq_get_devfreq_by_phandle(dev, 0);
-	if (IS_ERR(parent_devfreq)) {
-		ret = -EPROBE_DEFER;
-		goto err;
-	}
+	if (IS_ERR(parent_devfreq))
+		return -EPROBE_DEFER;
 
 	passive_data = devm_kzalloc(dev, sizeof(*passive_data), GFP_KERNEL);
-	if (!passive_data) {
-		ret = -ENOMEM;
-		goto err;
-	}
+	if (!passive_data)
+		return -ENOMEM;
+
 	passive_data->parent = parent_devfreq;
 
 	/* Add devfreq device for exynos bus with passive governor */
-	bus->devfreq = devm_devfreq_add_device(dev, profile, DEVFREQ_GOV_PASSIVE,
+	bus->devfreq = devm_devfreq_add_device(dev, profile,
+						DEVFREQ_GOV_PASSIVE,
 						passive_data);
 	if (IS_ERR(bus->devfreq)) {
 		dev_err(dev,
 			"failed to add devfreq dev with passive governor\n");
-		ret = PTR_ERR(bus->devfreq);
-		goto err;
+		return PTR_ERR(bus->devfreq);
 	}
 
-err:
-	return ret;
+	return 0;
 }
 
 static int exynos_bus_probe(struct platform_device *pdev)
@@ -400,18 +390,18 @@ static int exynos_bus_probe(struct platform_device *pdev)
 		return -EINVAL;
 	}
 
-	bus = devm_kzalloc(&pdev->dev, sizeof(*bus), GFP_KERNEL);
+	bus = devm_kzalloc(dev, sizeof(*bus), GFP_KERNEL);
 	if (!bus)
 		return -ENOMEM;
 	mutex_init(&bus->lock);
-	bus->dev = &pdev->dev;
+	bus->dev = dev;
 	platform_set_drvdata(pdev, bus);
 
 	profile = devm_kzalloc(dev, sizeof(*profile), GFP_KERNEL);
 	if (!profile)
 		return -ENOMEM;
 
-	node = of_parse_phandle(dev->of_node, "devfreq", 0);
+	node = of_parse_phandle(np, "devfreq", 0);
 	if (node) {
 		of_node_put(node);
 		passive = true;
