hwmon: (max31790) potential ERR_PTR dereference

We should only dereference "data" after we check if it is an error
pointer.

Fixes: 54187ff9d766 ('hwmon: (max31790) Convert to use new hwmon registration API')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

diff --git a/drivers/hwmon/max31790.c b/drivers/hwmon/max31790.c
index bef84e0..c1b9275 100644 (file)
--- a/drivers/hwmon/max31790.c
+++ b/drivers/hwmon/max31790.c
@@ -268,11 +268,13 @@ static int max31790_read_pwm(struct device *dev, u32 attr, int channel,
                             long *val)
 {
        struct max31790_data *data = max31790_update_device(dev);
-       u8 fan_config = data->fan_config[channel];
+       u8 fan_config;
 
        if (IS_ERR(data))
                return PTR_ERR(data);
 
+       fan_config = data->fan_config[channel];
+
        switch (attr) {
        case hwmon_pwm_input:
                *val = data->pwm[channel] >> 8;