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From:   Chuhong Yuan <hslester96@gmail.com>
Cc:     Lars-Peter Clausen <lars@metafoo.de>,
        Michael Hennerich <Michael.Hennerich@analog.com>,
        Jonathan Cameron <jic23@kernel.org>,
        Hartmut Knaack <knaack.h@gmx.de>,
        Peter Meerwald-Stadler <pmeerw@pmeerw.net>,
        Alexandru Ardelean <alexandru.ardelean@analog.com>,
        Paul Cercueil <paul.cercueil@analog.com>,
        linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org,
        Chuhong Yuan <hslester96@gmail.com>
Subject: [PATCH v3] iio: amplifiers: ad8366: Change devm_gpiod_get() to optional and add the missed check
Date:   Wed,  3 Jun 2020 17:26:10 +0800
Message-Id: <20200603092610.1424489-1-hslester96@gmail.com>
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Since if there is no GPIO, nothing happens, replace devm_gpiod_get()
with devm_gpiod_get_optional().
Also add IS_ERR() to fix the missing-check bug.

Fixes: cee211f4e5a0 ("iio: amplifiers: ad8366: Add support for the ADA4961 DGA")
Signed-off-by: Chuhong Yuan <hslester96@gmail.com>
---
Changes in v3:
  - Change devm_gpiod_get() to optional.
  - Modify description.

 drivers/iio/amplifiers/ad8366.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/amplifiers/ad8366.c b/drivers/iio/amplifiers/ad8366.c
index 62167b87caea..8819e8997f76 100644
--- a/drivers/iio/amplifiers/ad8366.c
+++ b/drivers/iio/amplifiers/ad8366.c
@@ -262,8 +262,12 @@ static int ad8366_probe(struct spi_device *spi)
 	case ID_ADA4961:
 	case ID_ADL5240:
 	case ID_HMC1119:
-		st->reset_gpio = devm_gpiod_get(&spi->dev, "reset",
+		st->reset_gpio = devm_gpiod_get_optional(&spi->dev, "reset",
 			GPIOD_OUT_HIGH);
+		if (IS_ERR(st->reset_gpio)) {
+			ret = PTR_ERR(st->reset_gpio);
+			goto error_disable_reg;
+		}
 		indio_dev->channels = ada4961_channels;
 		indio_dev->num_channels = ARRAY_SIZE(ada4961_channels);
 		break;
-- 
2.26.2