Re: udev and sysfs permissions

[Greg KH <greg@kroah.com>]

On Fri, May 20, 2005 at 05:53:33PM -0400, Jon Smirl wrote:
> On 5/20/05, Greg KH <greg@kroah.com> wrote:
> > On Fri, May 20, 2005 at 05:40:05PM -0400, Jon Smirl wrote:
> > > On 5/20/05, Greg KH <greg@kroah.com> wrote:
> > > > > That would make things simpler for driver writers if more devices are
> > > > > going to follow this model.
> > > >
> > > > I think you are going to be pretty unique here, as no one else has come
> > > > up with a situation yet that requires this.
> > >
> > > If the mantra about sysfs attributes being superior to IOCTLs is true,
> > > then anyone who converts to sysfs attributes is going to run into this
> > > problem.  In the IOCTL model permission obviously follows the owner of
> > > the /dev device. There is no parallel for this in the sysfs model.
> > 
> > True.  Hm, let me look into the sysfs code to see if we can just save
> > the changed attributes, so that they do not get lost.  That would be the
> > simplest solution, right?
> 
> That will work. Right now it is random for me from half an hour to
> four hours before they get lost.

Yes, see my previous comments about how the sysfs backing store works
to explain this.

thanks,

greg k-h


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