[PATCH v3 4/4] rust: drm: dispatch delayed work items to the private data

[Daniel Almeida]

Much like the patch that dispatched (regular) work items, we also need to
dispatch delayed work items in order not to trigger the orphan rule. This
allows a drm::Device<T> to dispatch the delayed work to T::Data.

Reviewed-by: Alice Ryhl <aliceryhl@xxxxxxxxxx>
Acked-by: Danilo Krummrich <dakr@xxxxxxxxxx>
Signed-off-by: Daniel Almeida <daniel.almeida@xxxxxxxxxxxxx>
---
 rust/kernel/drm/device.rs | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/rust/kernel/drm/device.rs b/rust/kernel/drm/device.rs
index 5db5c7e3bb7a..adbafe8db54d 100644
--- a/rust/kernel/drm/device.rs
+++ b/rust/kernel/drm/device.rs
@@ -19,6 +19,7 @@
     },
     types::Opaque,
     workqueue::{
+        HasDelayedWork,
         HasWork,
         Work,
         WorkItem, //
@@ -291,3 +292,15 @@ unsafe fn work_container_of(ptr: *mut Work<Device<T>, ID>) -> *mut Self {
         unsafe { crate::container_of!(data_ptr, Self, data) }
     }
 }
+
+// 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>,
+{
+}

-- 
2.53.0