lkml.org 
[lkml]   [2007]   [May]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Race free attributes in sysfs
On 5/22/07, Pierre Ossman <drzeus-list@drzeus.cx> 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).

I agree here - if it was just possible to do this between create and
add, this discussion would be moot.

> > 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).

I did a little helper struct for the firewire subsystem that might be
useful on a more general level. It's struct fw_attribute_group in
drivers/firewire/fw-device.h and the implementation is
init_fw_attribute_group in drivers/firewire/fw-device.c. But I agree,
attribute groups require a fair bit of boiler plate code.

cheers,
Kristian
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2007-05-22 18:01    [from the cache]
©2003-2014 Jasper Spaans. Advertise on this site