linux-kernel - [RESEND PATCH v2 4/4] iio: adc: rcar-gyroadc: use for_each_available_child_node

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Message-ID: <20240225142714.286440-5-jic23@kernel.org>
Date: Sun, 25 Feb 2024 14:27:14 +0000
From: Jonathan Cameron <jic23@...nel.org>
To: devicetree@...r.kernel.org,
	linux-iio@...r.kernel.org,
	Rob Herring <robh@...nel.org>,
	Frank Rowand <frowand.list@...il.com>,
	linux-kernel@...r.kernel.org,
	Julia Lawall <Julia.Lawall@...ia.fr>
Cc: Peter Zijlstra <peterz@...radead.org>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	marek.vasut@...il.com,
	Jonathan Cameron <Jonathan.Cameron@...wei.com>
Subject: [RESEND PATCH v2 4/4] iio: adc: rcar-gyroadc: use for_each_available_child_node_scoped()

From: Jonathan Cameron <Jonathan.Cameron@...wei.com>

Using automated cleanup to replace of_node_put() handling allows for
a simplfied flow by enabling direct returns on errors.

Non available child nodes should never have been considered; that
is ones where status != okay and was defined.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
---
 drivers/iio/adc/rcar-gyroadc.c | 21 ++++++---------------
 1 file changed, 6 insertions(+), 15 deletions(-)

diff --git a/drivers/iio/adc/rcar-gyroadc.c b/drivers/iio/adc/rcar-gyroadc.c
index d524f2e8e927..15a21d2860e7 100644
--- a/drivers/iio/adc/rcar-gyroadc.c
+++ b/drivers/iio/adc/rcar-gyroadc.c
@@ -318,7 +318,6 @@ static int rcar_gyroadc_parse_subdevs(struct iio_dev *indio_dev)
 	struct rcar_gyroadc *priv = iio_priv(indio_dev);
 	struct device *dev = priv->dev;
 	struct device_node *np = dev->of_node;
-	struct device_node *child;
 	struct regulator *vref;
 	unsigned int reg;
 	unsigned int adcmode = -1, childmode;
@@ -326,7 +325,7 @@ static int rcar_gyroadc_parse_subdevs(struct iio_dev *indio_dev)
 	unsigned int num_channels;
 	int ret, first = 1;
 
-	for_each_child_of_node(np, child) {
+	for_each_available_child_of_node_scoped(np, child) {
 		of_id = of_match_node(rcar_gyroadc_child_match, child);
 		if (!of_id) {
 			dev_err(dev, "Ignoring unsupported ADC \"%pOFn\".",
@@ -352,7 +351,7 @@ static int rcar_gyroadc_parse_subdevs(struct iio_dev *indio_dev)
 			num_channels = ARRAY_SIZE(rcar_gyroadc_iio_channels_3);
 			break;
 		default:
-			goto err_e_inval;
+			return -EINVAL;
 		}
 
 		/*
@@ -369,7 +368,7 @@ static int rcar_gyroadc_parse_subdevs(struct iio_dev *indio_dev)
 				dev_err(dev,
 					"Failed to get child reg property of ADC \"%pOFn\".\n",
 					child);
-				goto err_of_node_put;
+				return ret;
 			}
 
 			/* Channel number is too high. */
@@ -377,7 +376,7 @@ static int rcar_gyroadc_parse_subdevs(struct iio_dev *indio_dev)
 				dev_err(dev,
 					"Only %i channels supported with %pOFn, but reg = <%i>.\n",
 					num_channels, child, reg);
-				goto err_e_inval;
+				return -EINVAL;
 			}
 		}
 
@@ -386,7 +385,7 @@ static int rcar_gyroadc_parse_subdevs(struct iio_dev *indio_dev)
 			dev_err(dev,
 				"Channel %i uses different ADC mode than the rest.\n",
 				reg);
-			goto err_e_inval;
+			return -EINVAL;
 		}
 
 		/* Channel is valid, grab the regulator. */
@@ -396,8 +395,7 @@ static int rcar_gyroadc_parse_subdevs(struct iio_dev *indio_dev)
 		if (IS_ERR(vref)) {
 			dev_dbg(dev, "Channel %i 'vref' supply not connected.\n",
 				reg);
-			ret = PTR_ERR(vref);
-			goto err_of_node_put;
+			return PTR_ERR(vref);
 		}
 
 		priv->vref[reg] = vref;
@@ -422,7 +420,6 @@ static int rcar_gyroadc_parse_subdevs(struct iio_dev *indio_dev)
 		 * we can stop parsing here.
 		 */
 		if (childmode == RCAR_GYROADC_MODE_SELECT_1_MB88101A) {
-			of_node_put(child);
 			break;
 		}
 	}
@@ -433,12 +430,6 @@ static int rcar_gyroadc_parse_subdevs(struct iio_dev *indio_dev)
 	}
 
 	return 0;
-
-err_e_inval:
-	ret = -EINVAL;
-err_of_node_put:
-	of_node_put(child);
-	return ret;
 }
 
 static void rcar_gyroadc_deinit_supplies(struct iio_dev *indio_dev)
-- 
2.44.0