thermal: exynos: Use devm_* functions

devm_* functions are used to replace kzalloc, request_mem_region, ioremap
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: Sachin Kamat <sachin.kamat@samsung.com>
Signed-off-by: Amit Daniel Kachhap <amit.kachhap@linaro.org>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>

drivers/thermal/exynos_thermal.c

@@ -842,55 +842,44 @@ static int __devinit exynos_tmu_probe(struct platform_device *pdev)
 		dev_err(&pdev->dev, "No platform init data supplied.\n");
 		return -ENODEV;
 	}
-	data = kzalloc(sizeof(struct exynos_tmu_data), GFP_KERNEL);
+	data = devm_kzalloc(&pdev->dev, sizeof(struct exynos_tmu_data),
+					GFP_KERNEL);
 	if (!data) {
 		dev_err(&pdev->dev, "Failed to allocate driver structure\n");
 		return -ENOMEM;
 	}
 
 	data->irq = platform_get_irq(pdev, 0);
 	if (data->irq < 0) {
-		ret = data->irq;
 		dev_err(&pdev->dev, "Failed to get platform irq\n");
-		goto err_free;
+		return data->irq;
 	}
 
 	INIT_WORK(&data->irq_work, exynos_tmu_work);
 
 	data->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!data->mem) {
-		ret = -ENOENT;
 		dev_err(&pdev->dev, "Failed to get platform resource\n");
-		goto err_free;
+		return -ENOENT;
 	}
 
-	data->mem = request_mem_region(data->mem->start,
-			resource_size(data->mem), pdev->name);
-	if (!data->mem) {
-		ret = -ENODEV;
-		dev_err(&pdev->dev, "Failed to request memory region\n");
-		goto err_free;
-	}
-
-	data->base = ioremap(data->mem->start, resource_size(data->mem));
+	data->base = devm_request_and_ioremap(&pdev->dev, data->mem);
 	if (!data->base) {
-		ret = -ENODEV;
 		dev_err(&pdev->dev, "Failed to ioremap memory\n");
-		goto err_mem_region;
+		return -ENODEV;
 	}
 
-	ret = request_irq(data->irq, exynos_tmu_irq,
+	ret = devm_request_irq(&pdev->dev, data->irq, exynos_tmu_irq,
 		IRQF_TRIGGER_RISING, "exynos-tmu", data);
 	if (ret) {
 		dev_err(&pdev->dev, "Failed to request irq: %d\n", data->irq);
-		goto err_io_remap;
+		return ret;
 	}
 
 	data->clk = clk_get(NULL, "tmu_apbif");
 	if (IS_ERR(data->clk)) {
-		ret = PTR_ERR(data->clk);
 		dev_err(&pdev->dev, "Failed to get clock\n");
-		goto err_irq;
+		return  PTR_ERR(data->clk);
 	}
 
 	if (pdata->type == SOC_ARCH_EXYNOS ||
@@ -942,15 +931,6 @@ static int __devinit exynos_tmu_probe(struct platform_device *pdev)
 err_clk:
 	platform_set_drvdata(pdev, NULL);
 	clk_put(data->clk);
-err_irq:
-	free_irq(data->irq, data);
-err_io_remap:
-	iounmap(data->base);
-err_mem_region:
-	release_mem_region(data->mem->start, resource_size(data->mem));
-err_free:
-	kfree(data);
-
 	return ret;
 }
 
@@ -964,15 +944,8 @@ static int __devexit exynos_tmu_remove(struct platform_device *pdev)
 
 	clk_put(data->clk);
 
-	free_irq(data->irq, data);
-
-	iounmap(data->base);
-	release_mem_region(data->mem->start, resource_size(data->mem));
-
 	platform_set_drvdata(pdev, NULL);
 
-	kfree(data);
-
 	return 0;
 }