Re: [PATCH 1/6] gpio: make the gpiochip a real device

[Johan Hovold <johan@kernel.org>]

On Mon, Nov 02, 2015 at 01:17:01PM +0000, Mark Brown wrote:
> On Mon, Nov 02, 2015 at 02:14:56PM +0100, Johan Hovold wrote:
> > On Mon, Nov 02, 2015 at 01:06:33PM +0000, Mark Brown wrote:
> 
> > > > Dynamically allocated struct device are not the problem as then you're
> > > > not *reusing* the same device structure.
> 
> > > You may end up doing exactly that depending on what you get back from
> > > the allocator of course.
> 
> > But then the memory has already been released. You're not deregistering
> > and reregistering the same device as in your example.
> 
> Depends on your definition of "same" :)  You might get the same address
> back which has been known to confuse unhelpfully designed things.

Yeah, I got your point, but again my claim was that 

	device_unregister(dev);
	memset(dev);
	device_initialise(dev);
	...
	device_add(dev);

is not legal (and the current patch does not prevent this).

Johan