[PATCH v2 4/4] rust: drm: dispatch delayed work items to the private data

[Daniel Almeida <daniel.almeida@collabora.com>]

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.

Signed-off-by: Daniel Almeida <daniel.almeida@collabora.com>
---
 rust/kernel/drm/device.rs | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/rust/kernel/drm/device.rs b/rust/kernel/drm/device.rs
index c760a743e1df..ad0447e8763f 100644
--- a/rust/kernel/drm/device.rs
+++ b/rust/kernel/drm/device.rs
@@ -12,7 +12,7 @@
     prelude::*,
     sync::aref::{ARef, AlwaysRefCounted},
     types::Opaque,
-    workqueue::{HasWork, Work, WorkItem},
+    workqueue::{HasDelayedWork, HasWork, Work, WorkItem},
 };
 use core::{alloc::Layout, mem, ops::Deref, ptr, ptr::NonNull};
 
@@ -273,3 +273,15 @@ 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>,
+{
+}

-- 
2.52.0