rtc: rtc-stmp3xxx: use devm_*() functions

Use devm_*() functions to make cleanup paths simpler.
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-stmp3xxx.c

@@ -227,11 +227,7 @@ static int stmp3xxx_rtc_remove(struct platform_device *pdev)
 
 	writel(STMP3XXX_RTC_CTRL_ALARM_IRQ_EN,
 			rtc_data->io + STMP3XXX_RTC_CTRL_CLR);
-	free_irq(rtc_data->irq_alarm, &pdev->dev);
-	rtc_device_unregister(rtc_data->rtc);
 	platform_set_drvdata(pdev, NULL);
-	iounmap(rtc_data->io);
-	kfree(rtc_data);
 
 	return 0;
 }
@@ -242,22 +238,20 @@ static int stmp3xxx_rtc_probe(struct platform_device *pdev)
 	struct resource *r;
 	int err;
 
-	rtc_data = kzalloc(sizeof *rtc_data, GFP_KERNEL);
+	rtc_data = devm_kzalloc(&pdev->dev, sizeof(*rtc_data), GFP_KERNEL);
 	if (!rtc_data)
 		return -ENOMEM;
 
 	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!r) {
 		dev_err(&pdev->dev, "failed to get resource\n");
-		err = -ENXIO;
-		goto out_free;
+		return -ENXIO;
 	}
 
-	rtc_data->io = ioremap(r->start, resource_size(r));
+	rtc_data->io = devm_ioremap(&pdev->dev, r->start, resource_size(r));
 	if (!rtc_data->io) {
 		dev_err(&pdev->dev, "ioremap failed\n");
-		err = -EIO;
-		goto out_free;
+		return -EIO;
 	}
 
 	rtc_data->irq_alarm = platform_get_irq(pdev, 0);
@@ -265,8 +259,7 @@ static int stmp3xxx_rtc_probe(struct platform_device *pdev)
 	if (!(readl(STMP3XXX_RTC_STAT + rtc_data->io) &
 			STMP3XXX_RTC_STAT_RTC_PRESENT)) {
 		dev_err(&pdev->dev, "no device onboard\n");
-		err = -ENODEV;
-		goto out_remap;
+		return -ENODEV;
 	}
 
 	platform_set_drvdata(pdev, rtc_data);
@@ -281,31 +274,26 @@ static int stmp3xxx_rtc_probe(struct platform_device *pdev)
 			STMP3XXX_RTC_CTRL_ALARM_IRQ_EN,
 			rtc_data->io + STMP3XXX_RTC_CTRL_CLR);
 
-	rtc_data->rtc = rtc_device_register(pdev->name, &pdev->dev,
+	rtc_data->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
 				&stmp3xxx_rtc_ops, THIS_MODULE);
 	if (IS_ERR(rtc_data->rtc)) {
 		err = PTR_ERR(rtc_data->rtc);
-		goto out_remap;
+		goto out;
 	}
 
-	err = request_irq(rtc_data->irq_alarm, stmp3xxx_rtc_interrupt, 0,
-			"RTC alarm", &pdev->dev);
+	err = devm_request_irq(&pdev->dev, rtc_data->irq_alarm,
+			stmp3xxx_rtc_interrupt, 0, "RTC alarm", &pdev->dev);
 	if (err) {
 		dev_err(&pdev->dev, "Cannot claim IRQ%d\n",
 			rtc_data->irq_alarm);
-		goto out_irq_alarm;
+		goto out;
 	}
 
 	stmp3xxx_wdt_register(pdev);
 	return 0;
 
-out_irq_alarm:
-	rtc_device_unregister(rtc_data->rtc);
-out_remap:
+out:
 	platform_set_drvdata(pdev, NULL);
-	iounmap(rtc_data->io);
-out_free:
-	kfree(rtc_data);
 	return err;
 }