>
> On Mon, 2008-02-04 at 08:14 -0800, Greg KH wrote:
> > On Mon, Feb 04, 2008 at 08:27:55AM +0000, Adrian McMenamin wrote:
> > >
> > > On Sun, 2008-02-03 at 21:29 -0800, Greg KH wrote:
> > > > On Sun, Feb 03, 2008 at 08:00:47PM +0000, Adrian McMenamin wrote:
> > > > > From: Adrian McMenamin
> > > > >
> > > > > This patch fixes the regression noted here:
> > > > >
http://lkml.org/lkml/2008/1/26/189 as well as whitespace issues in the
> > > > > previous commit of this driver and the memory leaks noted here:
> > > > >
http://lkml.org/lkml/2008/2/2/143 (as well as one or two other minor
> > > > > cleanups).
> > > >
> > > > Which portion of the patch fixes the kobject WARN_ON()?
> > >
> > >
> > >
> > > + if (mdev->registered == 0) {
> > > + retval = device_register(&mdev->dev);
> > > + if (retval) {
> > > + printk(KERN_INFO
> > > + "Maple bus: Attempt to register device"
> > > + " (%x, %x) failed.\n",
> > > + mdev->port, mdev->unit);
> > > + maple_free_dev(mdev);
> > > + mdev = NULL;
> > > + return;
> > > + }
> > > + mdev->registered = 1;
> > > + }
> > > }
> > >
> > >
> > > Specifically the check on mdev->registered
> >
> > So the code path could cause devices to be registered more than once?
> > That seems broken, as no other bus that I know of needs such a check :(
> >
> > Is there a way to fix the root problem here, instead of this type of
> > change?
> >
>
> The hardware is very flaky. If I add in delays to the bus start, it will
> detect the devices, but it's not brilliant. Registering an empty device
> got round that problem, at the price of testing for the earlier
> registration.
