Do not overwrite errors reported from i2c functions, and don't ignore any errors. Cc: Jean-Francois Dagenais <jeff.dagenais@xxxxxxxxx> Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx> --- drivers/hwmon/max6650.c | 43 ++++++++++++++++++++++++------------------- 1 file changed, 24 insertions(+), 19 deletions(-) diff --git a/drivers/hwmon/max6650.c b/drivers/hwmon/max6650.c index b6b8f8edc1b0..ac05cc5627d7 100644 --- a/drivers/hwmon/max6650.c +++ b/drivers/hwmon/max6650.c @@ -618,8 +618,8 @@ static int max6650_init_client(struct max6650_data *data, struct i2c_client *client) { struct device *dev = &client->dev; - int config; - int err = -EIO; + int reg; + int err; u32 voltage; u32 prescale; u32 target_rpm; @@ -633,21 +633,20 @@ static int max6650_init_client(struct max6650_data *data, &prescale)) prescale = prescaler; - config = i2c_smbus_read_byte_data(client, MAX6650_REG_CONFIG); - - if (config < 0) { - dev_err(dev, "Error reading config, aborting.\n"); - return err; + reg = i2c_smbus_read_byte_data(client, MAX6650_REG_CONFIG); + if (reg < 0) { + dev_err(dev, "Error reading config register, aborting.\n"); + return reg; } switch (voltage) { case 0: break; case 5: - config &= ~MAX6650_CFG_V12; + reg &= ~MAX6650_CFG_V12; break; case 12: - config |= MAX6650_CFG_V12; + reg |= MAX6650_CFG_V12; break; default: dev_err(dev, "illegal value for fan_voltage (%d)\n", voltage); @@ -657,22 +656,22 @@ static int max6650_init_client(struct max6650_data *data, case 0: break; case 1: - config &= ~MAX6650_CFG_PRESCALER_MASK; + reg &= ~MAX6650_CFG_PRESCALER_MASK; break; case 2: - config = (config & ~MAX6650_CFG_PRESCALER_MASK) + reg = (reg & ~MAX6650_CFG_PRESCALER_MASK) | MAX6650_CFG_PRESCALER_2; break; case 4: - config = (config & ~MAX6650_CFG_PRESCALER_MASK) + reg = (reg & ~MAX6650_CFG_PRESCALER_MASK) | MAX6650_CFG_PRESCALER_4; break; case 8: - config = (config & ~MAX6650_CFG_PRESCALER_MASK) + reg = (reg & ~MAX6650_CFG_PRESCALER_MASK) | MAX6650_CFG_PRESCALER_8; break; case 16: - config = (config & ~MAX6650_CFG_PRESCALER_MASK) + reg = (reg & ~MAX6650_CFG_PRESCALER_MASK) | MAX6650_CFG_PRESCALER_16; break; default: @@ -680,16 +679,22 @@ static int max6650_init_client(struct max6650_data *data, } dev_info(dev, "Fan voltage: %dV, prescaler: %d.\n", - (config & MAX6650_CFG_V12) ? 12 : 5, - 1 << (config & MAX6650_CFG_PRESCALER_MASK)); + (reg & MAX6650_CFG_V12) ? 12 : 5, + 1 << (reg & MAX6650_CFG_PRESCALER_MASK)); - if (i2c_smbus_write_byte_data(client, MAX6650_REG_CONFIG, config)) { + err = i2c_smbus_write_byte_data(client, MAX6650_REG_CONFIG, reg); + if (err) { dev_err(dev, "Config write error, aborting.\n"); return err; } - data->config = config; - data->count = i2c_smbus_read_byte_data(client, MAX6650_REG_COUNT); + data->config = reg; + reg = i2c_smbus_read_byte_data(client, MAX6650_REG_COUNT); + if (reg < 0) { + dev_err(dev, "Failed to read count register, aborting.\n"); + return reg; + } + data->count = reg; if (!of_property_read_u32(client->dev.of_node, "maxim,fan-target-rpm", &target_rpm)) { -- 2.7.4