iio: adc: gyroadc: fix uninitialized return code

commit 90c6260c1905a68fb596844087f2223bd4657fee upstream.

gcc-9 complains about a blatant uninitialized variable use that
all earlier compiler versions missed:

drivers/iio/adc/rcar-gyroadc.c:510:5: warning: 'ret' may be used uninitialized in this function [-Wmaybe-uninitialized]

Return -EINVAL instead here and a few lines above it where
we accidentally return 0 on failure.

Cc: stable@vger.kernel.org
Fixes: 059c53b32329 ("iio: adc: Add Renesas GyroADC driver")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/iio/adc/rcar-gyroadc.c b/drivers/iio/adc/rcar-gyroadc.c
index 2c0d0316d149707f96e069b11711fa2988ae9fa8..b373acce5927277269a74ccad53e4ca7dfc307ec 100644 (file)
--- a/drivers/iio/adc/rcar-gyroadc.c
+++ b/drivers/iio/adc/rcar-gyroadc.c
@@ -382,7 +382,7 @@ static int rcar_gyroadc_parse_subdevs(struct iio_dev *indio_dev)
                                dev_err(dev,
                                        "Only %i channels supported with %pOFn, but reg = <%i>.\n",
                                        num_channels, child, reg);
-                               return ret;
+                               return -EINVAL;
                        }
                }
 
@@ -391,7 +391,7 @@ static int rcar_gyroadc_parse_subdevs(struct iio_dev *indio_dev)
                        dev_err(dev,
                                "Channel %i uses different ADC mode than the rest.\n",
                                reg);
-                       return ret;
+                       return -EINVAL;
                }
 
                /* Channel is valid, grab the regulator. */