[lm-sensors] [patch] hwmon: fix unchecked returncodes in w83791d

[jim.cromie@gmail.com (Jim Cromie)]

Jean Delvare wrote:
>> Fix unchecked return-status by replacing all unchecked calls 
>> to device_create_file with a single group declaration,
>> and one call to sysfs_create_group, and check that one return status.
>>
>> Signed-off-by:  Jim Cromie  <jim.cromie at gmail.com>
>> ---
>> $ diffstat pc-set/hwmon-unchecked-return-status-fixes-w83791d.patch
>>  w83791d.c |   83 +++++++++++++++++++++++++++++++++++++++++---------------------
>>  1 files changed, 55 insertions(+), 28 deletions(-)
>>
>> ---
>>
>> Its impressive (or embarrassing) how much slop you detect.
>> I trust this comment is in right place for auto-strip to 
>> keep it out of Changelog.  Is any of this automated, and if so,
>> are we/I getting it right (or close) ?
>>     
>
> Yes, anything between "---" and the beginning of the actual patch is
> dropped upstream. But I'm still editing things manually anyway so it's
> no big deal where you add your comments.
>
>   
>> @@ -1029,6 +1054,8 @@ static int w83791d_detach_client(struct 
>>  	if (data)
>>  		hwmon_device_unregister(data->class_dev);
>>  
>> +	sysfs_remove_group(&client->dev.kobj, &w83791d_group);
>> +
>>  	if ((err = i2c_detach_client(client)))
>>  		return err;
>>     
>
> The "if (data)" is used to differenciate between the real client and
> the subclients, exactly as is done in the w83781d driver. As subclients
> have no files, the call to sysfs_remove_group() should be made
> conditional as well. If not, it'll still work, but with a significant
> performance drop.
>
>   
on this item, I actually checked :-)

 w83791d_detect will fail unless data is sucessfully allocated,
so it must be there if detach_client is called.

but I suppose its safer (less action-at-a-distance) your way, esp wrt 
any future changes.
redo attached.

> Thanks,
>   

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