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hwmon: (lm80) fix a missing check of bus read in lm80 probe 

In lm80_probe(), if lm80_read_value() fails, it returns a negative
error number which is stored to data->fan[f_min] and will be further
used. We should avoid using the data if the read fails.

The fix checks if lm80_read_value() fails, and if so, returns with the
error number.

Signed-off-by: Kangjie Lu <kjlu@umn.edu>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Kangjie Lu 2018-12-21 13:10:39 -06:00 committed by Guenter Roeck
parent c9c6391551
commit 9aa3aa15f4
1 changed files with 9 additions and 2 deletions
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11
drivers/hwmon/lm80.c
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@ -628,6 +628,7 @@ static int lm80_probe(struct i2c_client *client,
struct device *dev = &client->dev;
struct device *hwmon_dev;
struct lm80_data *data;
int rv;
data = devm_kzalloc(dev, sizeof(struct lm80_data), GFP_KERNEL);
if (!data)
@ -640,8 +641,14 @@ static int lm80_probe(struct i2c_client *client,
lm80_init_client(client);
/* A few vars need to be filled upon startup */
data->fan[f_min][0] = lm80_read_value(client, LM80_REG_FAN_MIN(1));
data->fan[f_min][1] = lm80_read_value(client, LM80_REG_FAN_MIN(2));
rv = lm80_read_value(client, LM80_REG_FAN_MIN(1));
if (rv < 0)
return rv;
data->fan[f_min][0] = rv;
rv = lm80_read_value(client, LM80_REG_FAN_MIN(2));
if (rv < 0)
return rv;
data->fan[f_min][1] = rv;
hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
data, lm80_groups);