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| author | Frans Meulenbroeks <fransmeulenbroeks@gmail.com> | 2012-01-03 12:02:40 +0100 |
|---|---|---|
| committer | Guenter Roeck <guenter.roeck@ericsson.com> | 2012-01-05 08:19:33 -0800 |
| commit | 1f962f363b762887d8f9057598b6acacf9e80234 (patch) | |
| tree | 7b8154fc56cdd6cfab6e0125fdff4451dea48047 /drivers/hwmon/lm75.c | |
| parent | aac9fe9b4697868009e752562e743cc7984809bc (diff) | |
| download | linux-1f962f363b762887d8f9057598b6acacf9e80234.tar.gz linux-1f962f363b762887d8f9057598b6acacf9e80234.tar.bz2 linux-1f962f363b762887d8f9057598b6acacf9e80234.zip | |
hwmon: (lm75) added error handling
Add error handling so if lm75_update_device fails
an error is returned when reading the value through sysfs.
This is closely modeled after the way this is handled in ltc4261.
Signed-off-by: Frans Meulenbroeks <fransmeulenbroeks@gmail.com>
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Diffstat (limited to 'drivers/hwmon/lm75.c')
| -rw-r--r-- | drivers/hwmon/lm75.c | 23 |
1 files changed, 16 insertions, 7 deletions
diff --git a/drivers/hwmon/lm75.c b/drivers/hwmon/lm75.c index 1888dd0fc05f..903f22904bf4 100644 --- a/drivers/hwmon/lm75.c +++ b/drivers/hwmon/lm75.c @@ -93,6 +93,10 @@ static ssize_t show_temp(struct device *dev, struct device_attribute *da, { struct sensor_device_attribute *attr = to_sensor_dev_attr(da); struct lm75_data *data = lm75_update_device(dev); + + if (IS_ERR(data)) + return PTR_ERR(data); + return sprintf(buf, "%d\n", LM75_TEMP_FROM_REG(data->temp[attr->index])); } @@ -402,6 +406,7 @@ static struct lm75_data *lm75_update_device(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); struct lm75_data *data = i2c_get_clientdata(client); + struct lm75_data *ret = data; mutex_lock(&data->update_lock); @@ -414,19 +419,23 @@ static struct lm75_data *lm75_update_device(struct device *dev) int status; status = lm75_read_value(client, LM75_REG_TEMP[i]); - if (status < 0) - dev_dbg(&client->dev, "reg %d, err %d\n", - LM75_REG_TEMP[i], status); - else - data->temp[i] = status; + if (unlikely(status < 0)) { + dev_dbg(dev, + "LM75: Failed to read value: reg %d, error %d\n", + LM75_REG_TEMP[i], status); + ret = ERR_PTR(status); + data->valid = 0; + goto abort; + } + data->temp[i] = status; } data->last_updated = jiffies; data->valid = 1; } +abort: mutex_unlock(&data->update_lock); - - return data; + return ret; } /*-----------------------------------------------------------------------*/ |