iio: adc: mcp3422: Checking for error on probe

Some part of the configuration are not touched after the probe
and if something goes wrong on writing the initial one,
the chip will misbehave.
Adding an error checking ensures that the inital configuration will
be written correctly. Moreover ensures that a sensible configuration
will be saved in driver data and used subsequently as intended.

Signed-off-by: Angelo Compagnucci <angelo.compagnucci@gmail.com>
Reported-by: Maarten Brock <m.brock@vanmierlo.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

diff --git a/drivers/iio/adc/mcp3422.c b/drivers/iio/adc/mcp3422.c
index 6737df8d9bdd0a9206e71b2cb42ab25de121dc5e..63de705086ed499addccaf978e22fe1366eeb60d 100644 (file)
--- a/drivers/iio/adc/mcp3422.c
+++ b/drivers/iio/adc/mcp3422.c
@@ -382,7 +382,9 @@ static int mcp3422_probe(struct i2c_client *client,
                | MCP3422_CHANNEL_VALUE(0)
                | MCP3422_PGA_VALUE(MCP3422_PGA_1)
                | MCP3422_SAMPLE_RATE_VALUE(MCP3422_SRATE_240));
-       mcp3422_update_config(adc, config);
+       err = mcp3422_update_config(adc, config);
+       if (err < 0)
+               return err;
 
        err = devm_iio_device_register(&client->dev, indio_dev);
        if (err < 0)