Input: ad7877 - use managed resource allocations

Use managed resource allocations to simplify error handling during
probing failure and module exiting.

With this all the goto labels in the probe function together with
the cleanups in the remove function are unnecessary, therefore
removed.
Signed-off-by: Andi Shyti <andi@etezian.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/touchscreen/ad7877.c

@@ -417,8 +417,10 @@ static irqreturn_t ad7877_irq(int irq, void *handle)
 	return IRQ_HANDLED;
 }
 
-static void ad7877_disable(struct ad7877 *ts)
+static void ad7877_disable(void *data)
 {
+	struct ad7877 *ts = data;
+
 	mutex_lock(&ts->mutex);
 
 	if (!ts->disabled) {
@@ -707,12 +709,17 @@ static int ad7877_probe(struct spi_device *spi)
 		return err;
 	}
 
-	ts = kzalloc(sizeof(struct ad7877), GFP_KERNEL);
-	input_dev = input_allocate_device();
-	if (!ts || !input_dev) {
-		err = -ENOMEM;
-		goto err_free_mem;
-	}
+	ts = devm_kzalloc(&spi->dev, sizeof(struct ad7877), GFP_KERNEL);
+	if (!ts)
+		return -ENOMEM;
+
+	input_dev = devm_input_allocate_device(&spi->dev);
+	if (!input_dev)
+		return -ENOMEM;
+
+	err = devm_add_action_or_reset(&spi->dev, ad7877_disable, ts);
+	if (err)
+		return err;
 
 	spi_set_drvdata(spi, ts);
 	ts->spi = spi;
@@ -761,11 +768,10 @@ static int ad7877_probe(struct spi_device *spi)
 
 	verify = ad7877_read(spi, AD7877_REG_SEQ1);
 
-	if (verify != AD7877_MM_SEQUENCE){
+	if (verify != AD7877_MM_SEQUENCE) {
 		dev_err(&spi->dev, "%s: Failed to probe %s\n",
 			dev_name(&spi->dev), input_dev->name);
-		err = -ENODEV;
-		goto err_free_mem;
+		return -ENODEV;
 	}
 
 	if (gpio3)
@@ -775,47 +781,21 @@ static int ad7877_probe(struct spi_device *spi)
 
 	/* Request AD7877 /DAV GPIO interrupt */
 
-	err = request_threaded_irq(spi->irq, NULL, ad7877_irq,
-				   IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
-				   spi->dev.driver->name, ts);
+	err = devm_request_threaded_irq(&spi->dev, spi->irq, NULL, ad7877_irq,
+					IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+					spi->dev.driver->name, ts);
 	if (err) {
 		dev_dbg(&spi->dev, "irq %d busy?\n", spi->irq);
-		goto err_free_mem;
+		return err;
 	}
 
-	err = sysfs_create_group(&spi->dev.kobj, &ad7877_attr_group);
+	err = devm_device_add_group(&spi->dev, &ad7877_attr_group);
 	if (err)
-		goto err_free_irq;
+		return err;
 
 	err = input_register_device(input_dev);
 	if (err)
-		goto err_remove_attr_group;
-
-	return 0;
-
-err_remove_attr_group:
-	sysfs_remove_group(&spi->dev.kobj, &ad7877_attr_group);
-err_free_irq:
-	free_irq(spi->irq, ts);
-err_free_mem:
-	input_free_device(input_dev);
-	kfree(ts);
-	return err;
-}
-
-static int ad7877_remove(struct spi_device *spi)
-{
-	struct ad7877 *ts = spi_get_drvdata(spi);
-
-	sysfs_remove_group(&spi->dev.kobj, &ad7877_attr_group);
-
-	ad7877_disable(ts);
-	free_irq(ts->spi->irq, ts);
-
-	input_unregister_device(ts->input);
-	kfree(ts);
-
-	dev_dbg(&spi->dev, "unregistered touchscreen\n");
+		return err;
 
 	return 0;
 }
@@ -846,7 +826,6 @@ static struct spi_driver ad7877_driver = {
 		.pm	= &ad7877_pm,
 	},
 	.probe		= ad7877_probe,
-	.remove		= ad7877_remove,
 };
 
 module_spi_driver(ad7877_driver);