Re: [PATCH v3 17/27] rust: auxiliary: generalize Registration over ForLt

[Danilo Krummrich]

On Tue May 19, 2026 at 9:56 AM CEST, Eliot Courtney wrote:
> For example, in the next patch on the sample aux driver you can do:
>
> ```
> let data = adev.registration_data::<ForLt!(for<'a> Data<'static>)>()?;
> let pdev: &'static pci::Device<Bound> = data.parent;
> ```
>
> and mint a 'static reference to a bound device, which seems unsound to
> me.

Good catch, I applied the fix.

Additionally, we could probably reject unused lifetime binders in the ForLt!()
macro, which doesn't help when used with a type alias, but may be a good
defensive measure anyway.

> What about requiring all device ids declared to be supported by an aux
> bus driver to have the same rust registration data type?

Please see [1] and [2].

Thanks,
Danilo

[1] https://lore.kernel.org/driver-core/DIFBME3GXDC0.14UHJTPD6TTAE@xxxxxxxxxx/
[2] https://lore.kernel.org/driver-core/DIFXM2N21Q5J.2RIYLU11C5FR6@xxxxxxxxxx/