Re: [PATCH 2/2] rust: platform: require Send for Driver trait implementers

[Benno Lossin]

On Wed Mar 19, 2025 at 3:52 PM CET, Danilo Krummrich wrote:
> The instance of Self, returned and created by Driver::probe() is
> dropped in the bus' remove() callback.
>
> Request implementers of the Driver trait to implement Send, since the
> remove() callback is not guaranteed to run from the same thread as
> probe().
>
> Fixes: 683a63befc73 ("rust: platform: add basic platform device / driver abstractions")
> Reported-by: Alice Ryhl <aliceryhl@xxxxxxxxxx>
> Closes: https://lore.kernel.org/lkml/Z9rDxOJ2V2bPjj5i@xxxxxxxxxx/
> Signed-off-by: Danilo Krummrich <dakr@xxxxxxxxxx>

Good catch Alice!

Reviewed-by: Benno Lossin <benno.lossin@xxxxxxxxx>

---
Cheers,
Benno

> ---
>  rust/kernel/platform.rs | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/rust/kernel/platform.rs b/rust/kernel/platform.rs
> index 2811ca53d8b6..e37531bae8e9 100644
> --- a/rust/kernel/platform.rs
> +++ b/rust/kernel/platform.rs
> @@ -149,7 +149,7 @@ macro_rules! module_platform_driver {
>  ///     }
>  /// }
>  ///```
> -pub trait Driver {
> +pub trait Driver: Send {
>      /// The type holding driver private data about each device id supported by the driver.
>      ///
>      /// TODO: Use associated_type_defaults once stabilized: