Re: [PATCH 6/7] rust: workqueue: add Work::cancel_work_sync()

["Onur Özkan" <work@onurozkan.dev>]

On Tue, 04 Aug 2026 21:52:08 +0200
Danilo Krummrich <dakr@kernel.org> wrote:

> Add a method to cancel a work item and wait for it to finish if it is
> currently running.
> 
> This will also be used by ScopedWork's destructor to synchronously
> cancel work before dropping borrowed data.
> 
> Signed-off-by: Danilo Krummrich <dakr@kernel.org>
> ---
>  rust/kernel/workqueue/mod.rs | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/rust/kernel/workqueue/mod.rs b/rust/kernel/workqueue/mod.rs
> index 5de88c59b2e5..2b87f935712a 100644
> --- a/rust/kernel/workqueue/mod.rs
> +++ b/rust/kernel/workqueue/mod.rs
> @@ -585,6 +585,14 @@ pub unsafe fn raw_get(ptr: *const Self) -> *mut bindings::work_struct {
>          // the compiler does not complain that the `work` field is unused.
>          unsafe { Opaque::cast_into(core::ptr::addr_of!((*ptr).work)) }
>      }
> +
> +    /// Cancels the work item and waits for it to finish if it is running.
> +    ///
> +    /// Returns `true` if the work was pending, `false` otherwise.
> +    pub fn cancel_work_sync(&self) -> bool {
> +        // SAFETY: We have a reference to a valid, initialized Work, so the pointer is valid.
> +        unsafe { bindings::cancel_work_sync(Self::raw_get(self)) }
> +    }
>  }

We can't directly add cancel_sync support to every work items. Perhaps you could
pull the exiting effort for `cancel_sync` support [1] which is also used by the
tyr reset implementation [2]?

[1]: https://lore.kernel.org/all/20260617131731.145337-2-work@onurozkan.dev
[2]: https://lore.kernel.org/all/20260708114358.957305-1-work@onurozkan.dev

>  
>  /// Declares that a type contains a [`Work<T, ID>`].
> -- 
> 2.55.0
>