Re: [PATCH, RFC] sysfs: only allow one scheduled removal callback per kobj

[Alex Chiang <achiang@hp.com>]

* Cornelia Huck <cornelia.huck@de.ibm.com>:
> On Wed, 11 Mar 2009 Alex Chiang <achiang@hp.com> wrote:
> 
> > * Greg KH <gregkh@suse.de>:
> > > On Wed, Mar 11, 2009 Cornelia Huck wrote:
> > > > (For the original oops, I'd rather solve the problem by
> > > > making sure the caller doesn't trigger removal several
> > > > times - should probably be less code than the proposed
> > > > patch?)
> > > 
> > > Any ideas on how to do this?
> > 
> > I still think the original patch I proposed is the right
> > answer.
> 
> How about just putting a marker on your device that is going to
> be unregistered and refusing to schedule it again? (This marker
> could also be used to block other undesired actions; that's
> what ccwgroup does.)
 
I looked at what ccwgroup does, and you're right that it's a
smaller patch, and easy to implement.

But I still think that it makes more sense to fix the underlying
sysfs_schedule_callback() interface, rather than asking all the
callers to implement their own exclusion mechanisms.

Thanks.

/ac