[PATCH 1/4] Input: ads7846 - convert to devm_ alloc functions

[Marco Felsch <m.felsch@pengutronix.de>]

Convert to devm function to drop the 'no-mem' error handling path and
strip down the remove funciton a bit.

Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
---
 drivers/input/touchscreen/ads7846.c | 37 ++++++++++++-----------------
 1 file changed, 15 insertions(+), 22 deletions(-)

diff --git a/drivers/input/touchscreen/ads7846.c b/drivers/input/touchscreen/ads7846.c
index a2f45aefce08..5a7a8425d619 100644
--- a/drivers/input/touchscreen/ads7846.c
+++ b/drivers/input/touchscreen/ads7846.c
@@ -1283,13 +1283,17 @@ static int ads7846_probe(struct spi_device *spi)
 	if (err < 0)
 		return err;
 
-	ts = kzalloc(sizeof(struct ads7846), GFP_KERNEL);
-	packet = kzalloc(sizeof(struct ads7846_packet), GFP_KERNEL);
-	input_dev = input_allocate_device();
-	if (!ts || !packet || !input_dev) {
-		err = -ENOMEM;
-		goto err_free_mem;
-	}
+	ts = devm_kzalloc(&spi->dev, sizeof(*ts), GFP_KERNEL);
+	if (!ts)
+		return -ENOMEM;
+
+	packet = devm_kzalloc(&spi->dev, sizeof(*packet), GFP_KERNEL);
+	if (!packet)
+		return -ENOMEM;
+
+	input_dev = devm_input_allocate_device(&spi->dev);
+	if (!input_dev)
+		return -ENOMEM;
 
 	spi_set_drvdata(spi, ts);
 
@@ -1303,10 +1307,8 @@ static int ads7846_probe(struct spi_device *spi)
 	pdata = dev_get_platdata(&spi->dev);
 	if (!pdata) {
 		pdata = ads7846_probe_dt(&spi->dev);
-		if (IS_ERR(pdata)) {
-			err = PTR_ERR(pdata);
-			goto err_free_mem;
-		}
+		if (IS_ERR(pdata))
+			return PTR_ERR(pdata);
 	}
 
 	ts->model = pdata->model ? : 7846;
@@ -1321,7 +1323,7 @@ static int ads7846_probe(struct spi_device *spi)
 		if (pdata->filter_init != NULL) {
 			err = pdata->filter_init(pdata, &ts->filter_data);
 			if (err < 0)
-				goto err_free_mem;
+				return err;
 		}
 		ts->filter = pdata->filter;
 		ts->filter_cleanup = pdata->filter_cleanup;
@@ -1352,7 +1354,6 @@ static int ads7846_probe(struct spi_device *spi)
 
 	input_dev->name = ts->name;
 	input_dev->phys = ts->phys;
-	input_dev->dev.parent = &spi->dev;
 
 	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 	input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
@@ -1451,10 +1452,7 @@ static int ads7846_probe(struct spi_device *spi)
  err_cleanup_filter:
 	if (ts->filter_cleanup)
 		ts->filter_cleanup(ts->filter_data);
- err_free_mem:
-	input_free_device(input_dev);
-	kfree(packet);
-	kfree(ts);
+
 	return err;
 }
 
@@ -1467,8 +1465,6 @@ static int ads7846_remove(struct spi_device *spi)
 	ads7846_disable(ts);
 	free_irq(ts->spi->irq, ts);
 
-	input_unregister_device(ts->input);
-
 	ads784x_hwmon_unregister(spi, ts);
 
 	regulator_put(ts->reg);
@@ -1484,9 +1480,6 @@ static int ads7846_remove(struct spi_device *spi)
 	if (ts->filter_cleanup)
 		ts->filter_cleanup(ts->filter_data);
 
-	kfree(ts->packet);
-	kfree(ts);
-
 	dev_dbg(&spi->dev, "unregistered touchscreen\n");
 
 	return 0;
-- 
2.20.1