Re: [PATCH v3 4/4] rust: devres: implement register_release()

[Danilo Krummrich <dakr@kernel.org>]

On Thu, Jun 26, 2025 at 01:15:34PM +0200, Danilo Krummrich wrote:
> On Thu, Jun 26, 2025 at 12:36:23PM +0200, Benno Lossin wrote:
> > Or, we could change `Release` to be:
> > 
> >     pub trait Release {
> >         type Ptr: ForeignOwnable;
> > 
> >         fn release(this: Self::Ptr);
> >     }
> > 
> > and then `register_release` is:
> > 
> >     pub fn register_release<T: Release>(dev: &Device<Bound>, data: T::Ptr) -> Result
> > 
> > This way, one can store a `Box<T>` and get access to the `T` at the end.
> 
> I think this was also the case before? Well, it was P::Borrowed instead.
> 
> > Or if they store the value in an `Arc<T>`, they have the option to clone
> > it and give it to somewhere else.
> 
> Anyways, I really like this proposal of implementing the Release trait.

One downside seems to be that the compiler cannot infer T anymore with this
function signature.