rtc: rtc-vt8500: use devm_*() functions

Use devm_*() functions to make cleanup paths more simple.
Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/rtc/rtc-vt8500.c

@@ -231,20 +231,21 @@ static int vt8500_rtc_probe(struct platform_device *pdev)
 		return -ENXIO;
 	}
 
-	vt8500_rtc->res = request_mem_region(vt8500_rtc->res->start,
-					     resource_size(vt8500_rtc->res),
-					     "vt8500-rtc");
+	vt8500_rtc->res = devm_request_mem_region(&pdev->dev,
+					vt8500_rtc->res->start,
+					resource_size(vt8500_rtc->res),
+					"vt8500-rtc");
 	if (vt8500_rtc->res == NULL) {
 		dev_err(&pdev->dev, "failed to request I/O memory\n");
 		return -EBUSY;
 	}
 
-	vt8500_rtc->regbase = ioremap(vt8500_rtc->res->start,
+	vt8500_rtc->regbase = devm_ioremap(&pdev->dev, vt8500_rtc->res->start,
 				      resource_size(vt8500_rtc->res));
 	if (!vt8500_rtc->regbase) {
 		dev_err(&pdev->dev, "Unable to map RTC I/O memory\n");
 		ret = -EBUSY;
-		goto err_release;
+		goto err_return;
 	}
 
 	/* Enable RTC and set it to 24-hour mode */
@@ -257,11 +258,11 @@ static int vt8500_rtc_probe(struct platform_device *pdev)
 		ret = PTR_ERR(vt8500_rtc->rtc);
 		dev_err(&pdev->dev,
 			"Failed to register RTC device -> %d\n", ret);
-		goto err_unmap;
+		goto err_return;
 	}
 
-	ret = request_irq(vt8500_rtc->irq_alarm, vt8500_rtc_irq, 0,
-			  "rtc alarm", vt8500_rtc);
+	ret = devm_request_irq(&pdev->dev, vt8500_rtc->irq_alarm,
+				vt8500_rtc_irq, 0, "rtc alarm", vt8500_rtc);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "can't get irq %i, err %d\n",
 			vt8500_rtc->irq_alarm, ret);
@@ -272,11 +273,7 @@ static int vt8500_rtc_probe(struct platform_device *pdev)
 
 err_unreg:
 	rtc_device_unregister(vt8500_rtc->rtc);
-err_unmap:
-	iounmap(vt8500_rtc->regbase);
-err_release:
-	release_mem_region(vt8500_rtc->res->start,
-			   resource_size(vt8500_rtc->res));
+err_return:
 	return ret;
 }
 
@@ -284,15 +281,10 @@ static int vt8500_rtc_remove(struct platform_device *pdev)
 {
 	struct vt8500_rtc *vt8500_rtc = platform_get_drvdata(pdev);
 
-	free_irq(vt8500_rtc->irq_alarm, vt8500_rtc);
-
 	rtc_device_unregister(vt8500_rtc->rtc);
 
 	/* Disable alarm matching */
 	writel(0, vt8500_rtc->regbase + VT8500_RTC_IS);
-	iounmap(vt8500_rtc->regbase);
-	release_mem_region(vt8500_rtc->res->start,
-			   resource_size(vt8500_rtc->res));
 
 	platform_set_drvdata(pdev, NULL);