[PATCH v7 2/8] iio: magnetometer: ak8975: check if gpiod read was successful

[Joshua Crofts via B4 Relay <devnull+joshua.crofts1.gmail.com@kernel.org>]

From: Joshua Crofts <joshua.crofts1@gmail.com>

Add a check that ensures that valid data has been read from GPIOD. If
not, log an error and return the negative read value.

Suggested-by: Jonathan Cameron <jic23@kernel.org>
Reviewed-by: Nuno Sá <nuno.sa@analog.com>
Signed-off-by: Joshua Crofts <joshua.crofts1@gmail.com>
---
 drivers/iio/magnetometer/ak8975.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/iio/magnetometer/ak8975.c b/drivers/iio/magnetometer/ak8975.c
index b990c123e2808c2078abcfaf6b2ef86c09393e6b..63b6e8465f5f3873841550a1cd03ce86b95d1d67 100644
--- a/drivers/iio/magnetometer/ak8975.c
+++ b/drivers/iio/magnetometer/ak8975.c
@@ -658,6 +658,10 @@ static int wait_conversion_complete_gpio(struct ak8975_data *data,
 				 timeout_ms * USEC_PER_MSEC);
 	if (ret)
 		return ret;
+	if (val < 0) {
+		dev_err(&client->dev, "Error in reading GPIOD\n");
+		return val;
+	}
 
 	ret = i2c_smbus_read_byte_data(client, data->def->ctrl_regs[ST1]);
 	if (ret < 0)

-- 
2.47.3