Re: PATCH: (as177) Add class_device_unregister_wait() and platform_device_unregister_wait() to the driver model core

[viro _at_ xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx]

On Wed, Jan 28, 2004 at 03:03:31AM +0100, Roman Zippel wrote:
> Hi,
> 
> On Tue, 27 Jan 2004, Greg KH wrote:
> 
> > > All this is done without a module count, this means that
> > > pci_unregister_driver() cannot return before the last reference is gone.
> > > For network devices this is not that much of a problem, as they can be
> > > rather easily deconfigured automatically, but that's not that easy for
> > > mounted block devices, so one has to be damned careful when to call the
> > > exit function.
> >
> > Um, not anymore.  I can yank out a mounted block device and watch the
> > scsi core recover just fine.  The need to make everything hotpluggable
> > has fixed up a lot of issues like this (as well as made more
> > problems...)
> 
> Recovery of the scsi core is IMO one the smallest problems, but how do you
> recover at the block layer? The point is that you have here theoretically
> more one recovery strategy, but simply pulling out the module leaves you
> not much room for a controlled recovery.

Block layer is not too big issue.  We have almost everything in the tree
already - the main problem is to get check_disk_change() use regularized.
Now, sound and character devices in general...
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