linux-kernel - Re: Race free attributes in sysfs

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Message-ID: <46535FDD.3030801@rtr.ca>
Date:	Tue, 22 May 2007 17:25:49 -0400
From:	Mark Lord <lkml@....ca>
To:	Pierre Ossman <drzeus-list@...eus.cx>
Cc:	Kay Sievers <kay.sievers@...y.org>, Greg KH <greg@...ah.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Kristian Høgsberg <krh@...planet.net>
Subject: Re: Race free attributes in sysfs

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.
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