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rust: drm: Improve safety comment when using `Pin::into_inner_unchecked` 

The safety requirements for `Pin::into_inner_unchecked` state that the
returned pointer must be treated as pinned until it is dropped. Such a
guarantee is provided by the `ARef` type. This patch improves the safety
comment to better reflect this.

Signed-off-by: Ewan Chorynski <ewan.chorynski@ik.me>
Link: https://patch.msgid.link/20251228-drm-gem-safety-comment-v2-1-99bb861c3371@ik.me
Signed-off-by: Danilo Krummrich <dakr@kernel.org>
This commit is contained in:
Ewan Chorynski 2025-12-28 17:15:23 +01:00 committed by Danilo Krummrich
parent 7acc70476f
commit 4348796233
1 changed files with 1 additions and 1 deletions
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2
rust/kernel/drm/gem/mod.rs
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@ -210,7 +210,7 @@ impl<T: DriverObject> Object<T> {
// SAFETY: The arguments are all valid per the type invariants.
to_result(unsafe { bindings::drm_gem_object_init(dev.as_raw(), obj.obj.get(), size) })?;
// SAFETY: We never move out of `Self`.
// SAFETY: We will never move out of `Self` as `ARef<Self>` is always treated as pinned.
let ptr = KBox::into_raw(unsafe { Pin::into_inner_unchecked(obj) });
// SAFETY: `ptr` comes from `KBox::into_raw` and hence can't be NULL.