usb: gadget: s3c-hsudc: Use devm_* functions

devm_* functions are used to replace kzalloc, request_mem_region, ioremap
clk_get and request_irq functions in probe call. With the usage of devm_*
functions explicit freeing and unmapping is not required.

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/gadget/s3c-hsudc.c

@@ -135,7 +135,6 @@ struct s3c_hsudc_req {
  * @dev: The device reference used by probe function.
  * @lock: Lock to synchronize the usage of Endpoints (EP's are indexed).
  * @regs: Remapped base address of controller's register space.
- * @mem_rsrc: Device memory resource used for remapping device register space.
  * irq: IRQ number used by the controller.
  * uclk: Reference to the controller clock.
  * ep0state: Current state of EP0.
@@ -150,7 +149,6 @@ struct s3c_hsudc {
 	struct regulator_bulk_data supplies[ARRAY_SIZE(s3c_hsudc_supply_names)];
 	spinlock_t lock;
 	void __iomem *regs;
-	struct resource *mem_rsrc;
 	int irq;
 	struct clk *uclk;
 	int ep0state;
@@ -1271,7 +1269,7 @@ static int __devinit s3c_hsudc_probe(struct platform_device *pdev)
 	struct s3c24xx_hsudc_platdata *pd = pdev->dev.platform_data;
 	int ret, i;
 
-	hsudc = kzalloc(sizeof(struct s3c_hsudc) +
+	hsudc = devm_kzalloc(&pdev->dev, sizeof(struct s3c_hsudc) +
 			sizeof(struct s3c_hsudc_ep) * pd->epnum,
 			GFP_KERNEL);
 	if (!hsudc) {
@@ -1296,25 +1294,12 @@ static int __devinit s3c_hsudc_probe(struct platform_device *pdev)
 	}
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res) {
-		dev_err(dev, "unable to obtain driver resource data\n");
-		ret = -ENODEV;
-		goto err_res;
-	}
-
-	hsudc->mem_rsrc = request_mem_region(res->start, resource_size(res),
-				dev_name(&pdev->dev));
-	if (!hsudc->mem_rsrc) {
-		dev_err(dev, "failed to reserve register area\n");
-		ret = -ENODEV;
-		goto err_res;
-	}
 
-	hsudc->regs = ioremap(res->start, resource_size(res));
+	hsudc->regs = devm_request_and_ioremap(&pdev->dev, res);
 	if (!hsudc->regs) {
 		dev_err(dev, "error mapping device register area\n");
 		ret = -EBUSY;
-		goto err_remap;
+		goto err_res;
 	}
 
 	spin_lock_init(&hsudc->lock);
@@ -1337,21 +1322,22 @@ static int __devinit s3c_hsudc_probe(struct platform_device *pdev)
 	ret = platform_get_irq(pdev, 0);
 	if (ret < 0) {
 		dev_err(dev, "unable to obtain IRQ number\n");
-		goto err_irq;
+		goto err_res;
 	}
 	hsudc->irq = ret;
 
-	ret = request_irq(hsudc->irq, s3c_hsudc_irq, 0, driver_name, hsudc);
+	ret = devm_request_irq(&pdev->dev, hsudc->irq, s3c_hsudc_irq, 0,
+				driver_name, hsudc);
 	if (ret < 0) {
 		dev_err(dev, "irq request failed\n");
-		goto err_irq;
+		goto err_res;
 	}
 
-	hsudc->uclk = clk_get(&pdev->dev, "usb-device");
+	hsudc->uclk = devm_clk_get(&pdev->dev, "usb-device");
 	if (IS_ERR(hsudc->uclk)) {
 		dev_err(dev, "failed to find usb-device clock source\n");
 		ret = PTR_ERR(hsudc->uclk);
-		goto err_clk;
+		goto err_res;
 	}
 	clk_enable(hsudc->uclk);
 
@@ -1377,21 +1363,12 @@ err_add_udc:
 	device_unregister(&hsudc->gadget.dev);
 err_add_device:
 	clk_disable(hsudc->uclk);
-	clk_put(hsudc->uclk);
-err_clk:
-	free_irq(hsudc->irq, hsudc);
-err_irq:
-	iounmap(hsudc->regs);
-
-err_remap:
-	release_mem_region(res->start, resource_size(res));
 err_res:
 	if (!IS_ERR_OR_NULL(hsudc->transceiver))
 		usb_put_phy(hsudc->transceiver);
 
 	regulator_bulk_free(ARRAY_SIZE(hsudc->supplies), hsudc->supplies);
 err_supplies:
-	kfree(hsudc);
 	return ret;
 }