linux-kernel - Re: [PATCH 4/4] rust: drm: dispatch delayed work items to the private data

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Message-Id: <DFTDFR0943NX.3RTHNQURC11XQ@kernel.org>
Date: Tue, 20 Jan 2026 12:14:33 +0100
From: "Danilo Krummrich" <dakr@...nel.org>
To: "Daniel Almeida" <daniel.almeida@...labora.com>
Cc: "Miguel Ojeda" <ojeda@...nel.org>, "Boqun Feng" <boqun.feng@...il.com>,
 "Gary Guo" <gary@...yguo.net>, Björn Roy Baron
 <bjorn3_gh@...tonmail.com>, "Benno Lossin" <lossin@...nel.org>, "Andreas
 Hindborg" <a.hindborg@...nel.org>, "Alice Ryhl" <aliceryhl@...gle.com>,
 "Trevor Gross" <tmgross@...ch.edu>, "David Airlie" <airlied@...il.com>,
 "Simona Vetter" <simona@...ll.ch>, <rust-for-linux@...r.kernel.org>,
 <linux-kernel@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH 4/4] rust: drm: dispatch delayed work items to the
 private data

On Fri Jan 16, 2026 at 1:36 AM CET, Daniel Almeida wrote:
> +// SAFETY: Our `HasWork<T, ID>` implementation returns a `work_struct` that is
> +// stored in the `work` field of a `delayed_work` with the same access rules as
> +// the `work_struct` owing to the bound on `T::Data: HasDelayedWork<Device<T>,
> +// ID>`, which requires that `T::Data::raw_get_work` return a `work_struct` that
> +// is inside a `delayed_work`.
> +unsafe impl<T, const ID: u64> HasDelayedWork<Device<T>, ID> for Device<T>
> +where
> +    T: drm::Driver,
> +    T::Data: HasDelayedWork<Device<T>, ID>,
> +{
> +}

What do you intend to do within work that is queued for a DRM device? I assume
you have to access bus device resources?

Also, it would be nice to see how this is used in a driver. Can you please add a
patch for Tyr to the series?