linux-kernel - [PATCH 5.8 160/464] iio: amplifiers: ad8366: Change devm_gpiod_get() to optional and add the missed check

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Date:   Mon, 17 Aug 2020 17:11:53 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Chuhong Yuan <hslester96@...il.com>,
        Alexandru Ardelean <alexandru.ardelean@...log.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.8 160/464] iio: amplifiers: ad8366: Change devm_gpiod_get() to optional and add the missed check

From: Chuhong Yuan <hslester96@...il.com>

[ Upstream commit 9ca39411f9a9c833727750431da8dfd96ff80005 ]

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 warning.

Fixes: cee211f4e5a0 ("iio: amplifiers: ad8366: Add support for the ADA4961 DGA")
Signed-off-by: Chuhong Yuan <hslester96@...il.com>
Acked-by: Alexandru Ardelean <alexandru.ardelean@...log.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/iio/amplifiers/ad8366.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/amplifiers/ad8366.c b/drivers/iio/amplifiers/ad8366.c
index 62167b87caea8..8345ba65d41d8 100644
--- a/drivers/iio/amplifiers/ad8366.c
+++ b/drivers/iio/amplifiers/ad8366.c
@@ -262,8 +262,11 @@ 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",
-			GPIOD_OUT_HIGH);
+		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;
-- 
2.25.1