linux-kernel - [PATCH v2 1/8] iio: dac: ad8801: Make use of the helper function dev_err

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Date:   Tue, 28 Sep 2021 09:38:54 +0800
From:   Cai Huoqing <caihuoqing@...du.com>
To:     <caihuoqing@...du.com>
CC:     Lars-Peter Clausen <lars@...afoo.de>,
        Michael Hennerich <Michael.Hennerich@...log.com>,
        Jonathan Cameron <jic23@...nel.org>,
        "Vladimir Zapolskiy" <vz@...ia.com>,
        Marcus Folkesson <marcus.folkesson@...il.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        <linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-stm32@...md-mailman.stormreply.com>
Subject: [PATCH v2 1/8] iio: dac: ad8801: Make use of the helper function dev_err_probe()

When possible use dev_err_probe help to properly deal with the
PROBE_DEFER error, the benefit is that DEFER issue will be logged
in the devices_deferred debugfs file.
Using dev_err_probe() can reduce code size, and the error value
gets printed.

Signed-off-by: Cai Huoqing <caihuoqing@...du.com>
---
 drivers/iio/dac/ad8801.c | 15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

diff --git a/drivers/iio/dac/ad8801.c b/drivers/iio/dac/ad8801.c
index 6354b7c8f052..8acb9fee273c 100644
--- a/drivers/iio/dac/ad8801.c
+++ b/drivers/iio/dac/ad8801.c
@@ -123,10 +123,9 @@ static int ad8801_probe(struct spi_device *spi)
 	id = spi_get_device_id(spi);
 
 	state->vrefh_reg = devm_regulator_get(&spi->dev, "vrefh");
-	if (IS_ERR(state->vrefh_reg)) {
-		dev_err(&spi->dev, "Vrefh regulator not specified\n");
-		return PTR_ERR(state->vrefh_reg);
-	}
+	if (IS_ERR(state->vrefh_reg))
+		return dev_err_probe(&spi->dev, PTR_ERR(state->vrefh_reg),
+				     "Vrefh regulator not specified\n");
 
 	ret = regulator_enable(state->vrefh_reg);
 	if (ret) {
@@ -146,15 +145,15 @@ static int ad8801_probe(struct spi_device *spi)
 	if (id->driver_data == ID_AD8803) {
 		state->vrefl_reg = devm_regulator_get(&spi->dev, "vrefl");
 		if (IS_ERR(state->vrefl_reg)) {
-			dev_err(&spi->dev, "Vrefl regulator not specified\n");
-			ret = PTR_ERR(state->vrefl_reg);
+			ret = dev_err_probe(&spi->dev, PTR_ERR(state->vrefl_reg),
+					    "Vrefl regulator not specified\n");
 			goto error_disable_vrefh_reg;
 		}
 
 		ret = regulator_enable(state->vrefl_reg);
 		if (ret) {
-			dev_err(&spi->dev, "Failed to enable vrefl regulator: %d\n",
-					ret);
+			dev_err(&spi->dev,
+				"Failed to enable vrefl regulator: %d\n", ret);
 			goto error_disable_vrefh_reg;
 		}
 
-- 
2.25.1