Re: Race free attributes in sysfs

[Mark Lord <lkml@rtr.ca>]

Pierre Ossman wrote:
> Kay Sievers wrote:
>> We could change the driver-core to suppress the creation of an attribute
>> if the attribute's show() or store() method returns something like
>> -ENOENT at registration time?
>> The driver would pass _all_ possible attributes of the device at
>> registration time, but the core would only create the attributes which
>> are implemented for this particular device? Would that work for you?
>>   
> 
> Not sure. Not in an obvious way at least.
> 
> It also doesn't feel like "the kernel way". Generally you can
> create/allocate an object, assign attributes to it, then activate it.
> Couldn't it be done so that I can add sysfs stuff to a device after I
> just initialized it? (but before I add it).
> 
>> You can assign any number of attribute groups to the device. If they
>> don't have a group name, they will all be created directly at the device
>> level. Would that work for you?
>>
> I've had a look at sysfs groups and the biggest beef I have with those
> is that they're too low level. In order to use them I first need to
> create device attributes, then create an array of pointers to each attr
> member. It would be nice if I could just feed an array of device
> attributes (i.e. I want wrappers).

And how does this help to avoid the race condition?
Just curious.