linux-kernel - Re: [PATCH 1/2] rust: pci: require Send for Driver trait implementers

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Message-ID: <D8KC149B0URD.6I35KIJOEHT4@proton.me>
Date: Wed, 19 Mar 2025 15:02:43 +0000
From: Benno Lossin <benno.lossin@...ton.me>
To: Danilo Krummrich <dakr@...nel.org>, bhelgaas@...gle.com, gregkh@...uxfoundation.org, rafael@...nel.org, ojeda@...nel.org, alex.gaynor@...il.com, boqun.feng@...il.com, gary@...yguo.net, bjorn3_gh@...tonmail.com, a.hindborg@...nel.org, aliceryhl@...gle.com, tmgross@...ch.edu
Cc: linux-pci@...r.kernel.org, rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] rust: pci: require Send for Driver trait implementers

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: 1bd8b6b2c5d3 ("rust: pci: add basic PCI device / driver abstractions")
> Reported-by: Alice Ryhl <aliceryhl@...gle.com>
> Closes: https://lore.kernel.org/lkml/Z9rDxOJ2V2bPjj5i@google.com/
> Signed-off-by: Danilo Krummrich <dakr@...nel.org>

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

---
Cheers,
Benno

> ---
>  rust/kernel/pci.rs | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/rust/kernel/pci.rs b/rust/kernel/pci.rs
> index 0d09ae34a64d..22a32172b108 100644
> --- a/rust/kernel/pci.rs
> +++ b/rust/kernel/pci.rs
> @@ -222,7 +222,7 @@ macro_rules! pci_device_table {
>  ///```
>  /// Drivers must implement this trait in order to get a PCI driver registered. Please refer to the
>  /// `Adapter` documentation for an example.
> -pub trait Driver {
> +pub trait Driver: Send {
>      /// The type holding information about each device id supported by the driver.
>      ///
>      /// TODO: Use associated_type_defaults once stabilized: