Re: [PATCH v9 1/3] rust: add basic serial device bus abstractions

[Markus Probst]

On Sat, 2026-05-30 at 17:36 +0000, Markus Probst wrote:
> 
> +#[doc(hidden)]
> +#[pin_data(PinnedDrop)]
> +pub struct PrivateData<'bound, T: Driver> {
> +    sdev: &'bound Device<device::Bound>,
> +    #[pin]
> +    driver: UnsafeCell<MaybeUninit<T::Data<'bound>>>,
> +    #[pin]
> +    probe_complete: Completion,
> +    error: UnsafeCell<bool>,
> +}
> +
> +#[pinned_drop]
> +impl<T: Driver> PinnedDrop for PrivateData<'_, T> {
> +    fn drop(self: Pin<&mut Self>) {
> +        // SAFETY: No one has exclusive access to `self.error`.
> +        if !unsafe { *self.error.get() } {
> +            // SAFETY:
> +            // - We have exclusive access to `self.driver`.
> +            // - `self.driver` is guaranteed to be initialized.
> +            unsafe { (*self.driver.get()).assume_init_drop() };
> +        }
> +
> +        // SAFETY: `self.sdev.as_raw()` is guaranteed to be a pointer to a valid
> +        // `struct serdev_device`.
> +        unsafe { bindings::serdev_device_close(self.sdev.as_raw()) };
Ok, I might have sent this too early.

ignore for now. This is unsound.

Thanks
- Markus Probst

> +    }
> +}
> +

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