staging: goldfish: Introduce the use of managed interfaces

This patch introduces the use of managed interfaces like devm_kzalloc,
devm_ioremap, dmam_alloc_coherent, devm_request_irq and does away with
the calls to functions to free the allocated memory in the probe and
remove functions. Also, the labels are removed in the probe function.

Signed-off-by: Himangi Saraogi <himangi774@gmail.com>
Acked-by: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/goldfish/goldfish_audio.c

@@ -274,11 +274,9 @@ static int goldfish_audio_probe(struct platform_device *pdev)
 	struct goldfish_audio *data;
 	dma_addr_t buf_addr;
 
-	data = kzalloc(sizeof(*data), GFP_KERNEL);
-	if (data == NULL) {
-		ret = -ENOMEM;
-		goto err_data_alloc_failed;
-	}
+	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
+	if (data == NULL)
+		return -ENOMEM;
 	spin_lock_init(&data->lock);
 	init_waitqueue_head(&data->wait);
 	platform_set_drvdata(pdev, data);
@@ -286,38 +284,33 @@ static int goldfish_audio_probe(struct platform_device *pdev)
 	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (r == NULL) {
 		dev_err(&pdev->dev, "platform_get_resource failed\n");
-		ret = -ENODEV;
-		goto err_no_io_base;
-	}
-	data->reg_base = ioremap(r->start, PAGE_SIZE);
-	if (data->reg_base == NULL) {
-		ret = -ENOMEM;
-		goto err_no_io_base;
+		return -ENODEV;
 	}
+	data->reg_base = devm_ioremap(&pdev->dev, r->start, PAGE_SIZE);
+	if (data->reg_base == NULL)
+		return -ENOMEM;
 
 	data->irq = platform_get_irq(pdev, 0);
 	if (data->irq < 0) {
 		dev_err(&pdev->dev, "platform_get_irq failed\n");
-		ret = -ENODEV;
-		goto err_no_irq;
+		return -ENODEV;
 	}
-	data->buffer_virt = dma_alloc_coherent(&pdev->dev,
+	data->buffer_virt = dmam_alloc_coherent(&pdev->dev,
 				COMBINED_BUFFER_SIZE, &buf_addr, GFP_KERNEL);
 	if (data->buffer_virt == 0) {
-		ret = -ENOMEM;
 		dev_err(&pdev->dev, "allocate buffer failed\n");
-		goto err_alloc_write_buffer_failed;
+		return -ENOMEM;
 	}
 	data->buffer_phys = buf_addr;
 	data->write_buffer1 = data->buffer_virt;
 	data->write_buffer2 = data->buffer_virt + WRITE_BUFFER_SIZE;
 	data->read_buffer = data->buffer_virt + 2 * WRITE_BUFFER_SIZE;
 
-	ret = request_irq(data->irq, goldfish_audio_interrupt,
+	ret = devm_request_irq(&pdev->dev, data->irq, goldfish_audio_interrupt,
 					IRQF_SHARED, pdev->name, data);
 	if (ret) {
 		dev_err(&pdev->dev, "request_irq failed\n");
-		goto err_request_irq_failed;
+		return ret;
 	}
 
 	ret = misc_register(&goldfish_audio_device);
@@ -325,7 +318,7 @@ static int goldfish_audio_probe(struct platform_device *pdev)
 		dev_err(&pdev->dev,
 			"misc_register returned %d in goldfish_audio_init\n",
 								ret);
-		goto err_misc_register_failed;
+		return ret;
 	}
 
 	AUDIO_WRITE64(data, AUDIO_SET_WRITE_BUFFER_1,
@@ -344,31 +337,11 @@ static int goldfish_audio_probe(struct platform_device *pdev)
 
 	audio_data = data;
 	return 0;
-
-err_misc_register_failed:
-	free_irq(data->irq, data);
-err_request_irq_failed:
-	dma_free_coherent(&pdev->dev, COMBINED_BUFFER_SIZE,
-					data->buffer_virt, data->buffer_phys);
-err_alloc_write_buffer_failed:
-err_no_irq:
-	iounmap(data->reg_base);
-err_no_io_base:
-	kfree(data);
-err_data_alloc_failed:
-	return ret;
 }
 
 static int goldfish_audio_remove(struct platform_device *pdev)
 {
-	struct goldfish_audio *data = platform_get_drvdata(pdev);
-
 	misc_deregister(&goldfish_audio_device);
-	free_irq(data->irq, data);
-	dma_free_coherent(&pdev->dev, COMBINED_BUFFER_SIZE,
-					data->buffer_virt, data->buffer_phys);
-	iounmap(data->reg_base);
-	kfree(data);
 	audio_data = NULL;
 	return 0;
 }