hwmon: (lm80) add error handling

The LM80 driver currently does not return errors after I2C access failures.
Add it.

Signed-off-by: Frans Meulenbroeks <fransmeulenbroeks@gmail.com>
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>

1 files changed, 101 insertions, 31 deletions

diff --git a/drivers/hwmon/lm80.c b/drivers/hwmon/lm80.c
index 0891b38ffec0..616f470c38b3 100644
--- a/drivers/hwmon/lm80.c
+++ b/drivers/hwmon/lm80.c
@@ -170,6 +170,8 @@ static ssize_t show_in_##suffix(struct device *dev, \
 { \
         int nr = to_sensor_dev_attr(attr)->index; \
         struct lm80_data *data = lm80_update_device(dev); \
+        if (IS_ERR(data)) \
+                return PTR_ERR(data); \
         return sprintf(buf, "%d\n", IN_FROM_REG(data->value[nr])); \
 }
 show_in(min, in_min)
@@ -200,6 +202,8 @@ static ssize_t show_fan_##suffix(struct device *dev, \
 { \
         int nr = to_sensor_dev_attr(attr)->index; \
         struct lm80_data *data = lm80_update_device(dev); \
+        if (IS_ERR(data)) \
+                return PTR_ERR(data); \
         return sprintf(buf, "%d\n", FAN_FROM_REG(data->value[nr], \
                        DIV_FROM_REG(data->fan_div[nr]))); \
 }
@@ -211,6 +215,8 @@ static ssize_t show_fan_div(struct device *dev, struct device_attribute *attr,
 {
         int nr = to_sensor_dev_attr(attr)->index;
         struct lm80_data *data = lm80_update_device(dev);
+        if (IS_ERR(data))
+                return PTR_ERR(data);
         return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]));
 }
 
@@ -283,6 +289,8 @@ static ssize_t show_temp_input1(struct device *dev,
         struct device_attribute *attr, char *buf)
 {
         struct lm80_data *data = lm80_update_device(dev);
+        if (IS_ERR(data))
+                return PTR_ERR(data);
         return sprintf(buf, "%ld\n", TEMP_FROM_REG(data->temp));
 }
 
@@ -291,6 +299,8 @@ static ssize_t show_temp_##suffix(struct device *dev, \
         struct device_attribute *attr, char *buf) \
 { \
         struct lm80_data *data = lm80_update_device(dev); \
+        if (IS_ERR(data)) \
+                return PTR_ERR(data); \
         return sprintf(buf, "%d\n", TEMP_LIMIT_FROM_REG(data->value)); \
 }
 show_temp(hot_max, temp_hot_max);
@@ -321,6 +331,8 @@ static ssize_t show_alarms(struct device *dev, struct device_attribute *attr,
                            char *buf)
 {
         struct lm80_data *data = lm80_update_device(dev);
+        if (IS_ERR(data))
+                return PTR_ERR(data);
         return sprintf(buf, "%u\n", data->alarms);
 }
 
@@ -329,6 +341,8 @@ static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
 {
         int bitnr = to_sensor_dev_attr(attr)->index;
         struct lm80_data *data = lm80_update_device(dev);
+        if (IS_ERR(data))
+                return PTR_ERR(data);
         return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
 }
 
@@ -563,50 +577,106 @@ static struct lm80_data *lm80_update_device(struct device *dev)
         struct i2c_client *client = to_i2c_client(dev);
         struct lm80_data *data = i2c_get_clientdata(client);
         int i;
+        int rv;
+        int prev_rv;
+        struct lm80_data *ret = data;
 
         mutex_lock(&data->update_lock);
 
         if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) {
                 dev_dbg(&client->dev, "Starting lm80 update\n");
                 for (i = 0; i <= 6; i++) {
-                        data->in[i] =
-                            lm80_read_value(client, LM80_REG_IN(i));
-                        data->in_min[i] =
-                            lm80_read_value(client, LM80_REG_IN_MIN(i));
-                        data->in_max[i] =
-                            lm80_read_value(client, LM80_REG_IN_MAX(i));
+                        rv = lm80_read_value(client, LM80_REG_IN(i));
+                        if (rv < 0)
+                                goto abort;
+                        data->in[i] = rv;
+
+                        rv = lm80_read_value(client, LM80_REG_IN_MIN(i));
+                        if (rv < 0)
+                                goto abort;
+                        data->in_min[i] = rv;
+
+                        rv = lm80_read_value(client, LM80_REG_IN_MAX(i));
+                        if (rv < 0)
+                                goto abort;
+                        data->in_max[i] = rv;
                 }
-                data->fan[0] = lm80_read_value(client, LM80_REG_FAN1);
-                data->fan_min[0] =
-                    lm80_read_value(client, LM80_REG_FAN_MIN(1));
-                data->fan[1] = lm80_read_value(client, LM80_REG_FAN2);
-                data->fan_min[1] =
-                    lm80_read_value(client, LM80_REG_FAN_MIN(2));
-
-                data->temp =
-                    (lm80_read_value(client, LM80_REG_TEMP) << 8) |
-                    (lm80_read_value(client, LM80_REG_RES) & 0xf0);
-                data->temp_os_max =
-                    lm80_read_value(client, LM80_REG_TEMP_OS_MAX);
-                data->temp_os_hyst =
-                    lm80_read_value(client, LM80_REG_TEMP_OS_HYST);
-                data->temp_hot_max =
-                    lm80_read_value(client, LM80_REG_TEMP_HOT_MAX);
-                data->temp_hot_hyst =
-                    lm80_read_value(client, LM80_REG_TEMP_HOT_HYST);
-
-                i = lm80_read_value(client, LM80_REG_FANDIV);
-                data->fan_div[0] = (i >> 2) & 0x03;
-                data->fan_div[1] = (i >> 4) & 0x03;
-                data->alarms = lm80_read_value(client, LM80_REG_ALARM1) +
-                    (lm80_read_value(client, LM80_REG_ALARM2) << 8);
+
+                rv = lm80_read_value(client, LM80_REG_FAN1);
+                if (rv < 0)
+                        goto abort;
+                data->fan[0] = rv;
+
+                rv = lm80_read_value(client, LM80_REG_FAN_MIN(1));
+                if (rv < 0)
+                        goto abort;
+                data->fan_min[0] = rv;
+
+                rv = lm80_read_value(client, LM80_REG_FAN2);
+                if (rv < 0)
+                        goto abort;
+                data->fan[1] = rv;
+
+                rv = lm80_read_value(client, LM80_REG_FAN_MIN(2));
+                if (rv < 0)
+                        goto abort;
+                data->fan_min[1] = rv;
+
+                prev_rv = rv = lm80_read_value(client, LM80_REG_TEMP);
+                if (rv < 0)
+                        goto abort;
+                rv = lm80_read_value(client, LM80_REG_RES);
+                if (rv < 0)
+                        goto abort;
+                data->temp = (prev_rv << 8) | (rv & 0xf0);
+
+                rv = lm80_read_value(client, LM80_REG_TEMP_OS_MAX);
+                if (rv < 0)
+                        goto abort;
+                data->temp_os_max = rv;
+
+                rv = lm80_read_value(client, LM80_REG_TEMP_OS_HYST);
+                if (rv < 0)
+                        goto abort;
+                data->temp_os_hyst = rv;
+
+                rv = lm80_read_value(client, LM80_REG_TEMP_HOT_MAX);
+                if (rv < 0)
+                        goto abort;
+                data->temp_hot_max = rv;
+
+                rv = lm80_read_value(client, LM80_REG_TEMP_HOT_HYST);
+                if (rv < 0)
+                        goto abort;
+                data->temp_hot_hyst = rv;
+
+                rv = lm80_read_value(client, LM80_REG_FANDIV);
+                if (rv < 0)
+                        goto abort;
+                data->fan_div[0] = (rv >> 2) & 0x03;
+                data->fan_div[1] = (rv >> 4) & 0x03;
+
+                prev_rv = rv = lm80_read_value(client, LM80_REG_ALARM1);
+                if (rv < 0)
+                        goto abort;
+                rv = lm80_read_value(client, LM80_REG_ALARM2);
+                if (rv < 0)
+                        goto abort;
+                data->alarms = prev_rv + (rv << 8);
+
                 data->last_updated = jiffies;
                 data->valid = 1;
         }
+        goto done;
+
+abort:
+        ret = ERR_PTR(rv);
+        data->valid = 0;
 
+done:
         mutex_unlock(&data->update_lock);
 
-        return data;
+        return ret;
 }
 
 static int __init sensors_lm80_init(void)