i2c: versatile: Convert to use resource managed devm_* APIs

Use devm_* APIs to simplify the code a bit.
This patch also fixes the memory leak when unload the module.
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Tested-by: Liviu Dudau <Liviu.Dudau@arm.com>
Acked-by: Liviu Dudau <Liviu.Dudau@arm.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

drivers/i2c/busses/i2c-versatile.c

@@ -70,28 +70,14 @@ static int i2c_versatile_probe(struct platform_device *dev)
 	struct resource *r;
 	int ret;
 
+	i2c = devm_kzalloc(&dev->dev, sizeof(struct i2c_versatile), GFP_KERNEL);
+	if (!i2c)
+		return -ENOMEM;
+
 	r = platform_get_resource(dev, IORESOURCE_MEM, 0);
-	if (!r) {
-		ret = -EINVAL;
-		goto err_out;
-	}
-
-	if (!request_mem_region(r->start, resource_size(r), "versatile-i2c")) {
-		ret = -EBUSY;
-		goto err_out;
-	}
-
-	i2c = kzalloc(sizeof(struct i2c_versatile), GFP_KERNEL);
-	if (!i2c) {
-		ret = -ENOMEM;
-		goto err_release;
-	}
-
-	i2c->base = ioremap(r->start, resource_size(r));
-	if (!i2c->base) {
-		ret = -ENOMEM;
-		goto err_free;
-	}
+	i2c->base = devm_ioremap_resource(&dev->dev, r);
+	if (IS_ERR(i2c->base))
+		return PTR_ERR(i2c->base);
 
 	writel(SCL | SDA, i2c->base + I2C_CONTROLS);
 
@@ -105,18 +91,12 @@ static int i2c_versatile_probe(struct platform_device *dev)
 
 	i2c->adap.nr = dev->id;
 	ret = i2c_bit_add_numbered_bus(&i2c->adap);
-	if (ret >= 0) {
-		platform_set_drvdata(dev, i2c);
-		return 0;
-	}
-
-	iounmap(i2c->base);
- err_free:
-	kfree(i2c);
- err_release:
-	release_mem_region(r->start, resource_size(r));
- err_out:
-	return ret;
+	if (ret < 0)
+		return ret;
+
+	platform_set_drvdata(dev, i2c);
+
+	return 0;
 }
 
 static int i2c_versatile_remove(struct platform_device *dev)