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iio: adc: handle unknow of_device_id data 

If we get an unknown 'childmode' value, a number of variables are not
initialized properly:

drivers/iio/adc/rcar-gyroadc.c: In function 'rcar_gyroadc_probe':
drivers/iio/adc/rcar-gyroadc.c:390:5: error: 'num_channels' may be used uninitialized in this function [-Werror=maybe-uninitialized]
drivers/iio/adc/rcar-gyroadc.c:426:22: error: 'sample_width' may be used uninitialized in this function [-Werror=maybe-uninitialized]
drivers/iio/adc/rcar-gyroadc.c:428:23: error: 'channels' may be used uninitialized in this function [-Werror=maybe-uninitialized]

The driver is currently correct, but handling this properly is more robust
for possible modifications.

There is also a false-positive warning about adcmode being possibly uninitialized,
but that cannot happen as we also check the 'first' flag:

drivers/iio/adc/rcar-gyroadc.c:398:26: error: 'adcmode' may be used uninitialized in this function [-Werror=maybe-uninitialized]

This adds an initialization for 'adcmode' and bails out for any unknown childmode.

Fixes: 059c53b323 ("iio: adc: Add Renesas GyroADC driver")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Marek Vasut <marek.vasut@gmail.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Arnd Bergmann 2017-02-03 18:01:23 +01:00 committed by Jonathan Cameron
parent 0f06feba91
commit 17fa2dcbd6
1 changed files with 3 additions and 1 deletions
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4
drivers/iio/adc/rcar-gyroadc.c
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@ -336,7 +336,7 @@ static int rcar_gyroadc_parse_subdevs(struct iio_dev *indio_dev)
struct device_node *child;
struct regulator *vref;
unsigned int reg;
unsigned int adcmode, childmode;
unsigned int adcmode = -1, childmode;
unsigned int sample_width;
unsigned int num_channels;
int ret, first = 1;
@ -366,6 +366,8 @@ static int rcar_gyroadc_parse_subdevs(struct iio_dev *indio_dev)
channels = rcar_gyroadc_iio_channels_3;
num_channels = ARRAY_SIZE(rcar_gyroadc_iio_channels_3);
break;
default:
return -EINVAL;
}
/*