Sun, Nov 29, 2015 at 10:04:07AM CET, gerlitz...@gmail.com wrote:
>[..]
>> +enum mlxsw_hwmon_attr_type {
>> + MLXSW_HWMON_ATTR_TYPE_TEMP,
>> + MLXSW_HWMON_ATTR_TYPE_TEMP_MAX,
>> +};
>> +
>> +static void mlxsw_hwmon_attr_add(struct mlxsw_hwmon *mlxsw_hwmon,
>> + enum mlxsw_hwmon_attr_type attr_type,
>> + unsigned int type_index, unsigned int num) {
>> + struct mlxsw_hwmon_attr *mlxsw_hwmon_attr;
>> + unsigned int attr_index;
>> +
>> + attr_index = mlxsw_hwmon->attrs_count;
>> + mlxsw_hwmon_attr = &mlxsw_hwmon->hwmon_attrs[attr_index];
>> +
>> + switch (attr_type) {
>> + case MLXSW_HWMON_ATTR_TYPE_TEMP:
>> + mlxsw_hwmon_attr->dev_attr.show = mlxsw_hwmon_temp_show;
>> + mlxsw_hwmon_attr->dev_attr.attr.mode = S_IRUGO;
>> + snprintf(mlxsw_hwmon_attr->name,
>> sizeof(mlxsw_hwmon_attr->name),
>> + "temp%u_input", num + 1);
>> + break;
>> + case MLXSW_HWMON_ATTR_TYPE_TEMP_MAX:
>> + mlxsw_hwmon_attr->dev_attr.show = mlxsw_hwmon_temp_max_show;
>> + mlxsw_hwmon_attr->dev_attr.attr.mode = S_IRUGO;
>> + snprintf(mlxsw_hwmon_attr->name,
>> sizeof(mlxsw_hwmon_attr->name),
>> + "temp%u_highest", num + 1);
>> + break;
>> + default:
>> + BUG();
>
>Guys, do we really have to crash the whole system just b/c somehow an unknown
>value propagated here during **init** time?
>
>I don't think so.
"default" case simply *cannot* happen. If it happens, it is a stack
corruption or some other fatal problem. I believe that BUG is
appropriate at these cases.
>
>> +
>> + mlxsw_hwmon_attr->type_index = type_index;
>> + mlxsw_hwmon_attr->hwmon = mlxsw_hwmon;
>> + mlxsw_hwmon_attr->dev_attr.attr.name = mlxsw_hwmon_attr->name;
>> + sysfs_attr_init(&mlxsw_hwmon_attr->dev_attr.attr);
>> +
>> + mlxsw_hwmon->attrs[attr_index] = &mlxsw_hwmon_attr->dev_attr.attr;
>> + mlxsw_hwmon->attrs_count++;
>> +}
>> +
>
>[...]
>> +int mlxsw_hwmon_init(struct mlxsw_core *mlxsw_core,
>> + const struct mlxsw_bus_info *mlxsw_bus_info,
>> + struct mlxsw_hwmon **p_hwmon)
>> +{
>> + struct mlxsw_hwmon *mlxsw_hwmon;
>> + struct device *hwmon_dev;
>> + int err;
>> +
>> + mlxsw_hwmon = kzalloc(sizeof(*mlxsw_hwmon), GFP_KERNEL);
>> + if (!mlxsw_hwmon)
>> + return -ENOMEM;
>> + mlxsw_hwmon->core = mlxsw_core;
>> + mlxsw_hwmon->bus_info = mlxsw_bus_info;
>> +
>> + err = mlxsw_hwmon_temp_init(mlxsw_hwmon);
>> + if (err)
>> + goto err_temp_init;
>> +
>> + mlxsw_hwmon->groups[0] = &mlxsw_hwmon->group;
>> + mlxsw_hwmon->group.attrs = mlxsw_hwmon->attrs;
>> +
>> + hwmon_dev =
>> devm_hwmon_device_register_with_groups(mlxsw_bus_info->dev,
>> + "mlxsw",
>> + mlxsw_hwmon,
>> +
>> mlxsw_hwmon->groups);
>> + if (IS_ERR(hwmon_dev)) {
>> + err = PTR_ERR(hwmon_dev);
>> + goto err_hwmon_register;
>> + }
>> +
>> + mlxsw_hwmon->hwmon_dev = hwmon_dev;
>> + *p_hwmon = mlxsw_hwmon;
>> + return 0;
>> +
>> +err_hwmon_register:
>> +err_temp_init:
>> + kfree(mlxsw_hwmon);
>> + return err;
>> +}
>> +
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