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hwmon: (ina2xx) don't accept shunt values greater than the calibration factor

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Shunt resistance values greater than the chip's calibration factor make no
sense since the actual value written to the register equals:

	<calibration factor> / <shunt>

Bail-out from ina2xx_probe() if the configured value is greater than the
calibration factor.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Bartosz Golaszewski 2015-01-05 15:20:54 +01:00 committed by Guenter Roeck
parent f4fe902717
commit e794704000
1 changed files with 2 additions and 1 deletions
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3
drivers/hwmon/ina2xx.c
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@ -313,7 +313,8 @@ static int ina2xx_probe(struct i2c_client *client,
data->config = &ina2xx_config[data->kind];
data->client = client;
if (data->rshunt <= 0)
if (data->rshunt <= 0 ||
data->rshunt > data->config->calibration_factor)
return -ENODEV;
ret = ina2xx_init(data);