[PATCH v5 10/19] rust: drm: pin ioctl Device reference to Normal context

[Danilo Krummrich <dakr@kernel.org>]

Explicitly annotate the Device reference produced by from_raw() in the
ioctl dispatch macro as Device<_, Normal>. Without this annotation, the
context is inferred from the handler's first parameter type, which would
allow a handler declaring &Device<T, Registered> to obtain a Registered
reference without runtime proof via RegistrationGuard.

Reviewed-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Danilo Krummrich <dakr@kernel.org>
---
 rust/kernel/drm/ioctl.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/rust/kernel/drm/ioctl.rs b/rust/kernel/drm/ioctl.rs
index ccf4150d83b6..6f5a9877bdae 100644
--- a/rust/kernel/drm/ioctl.rs
+++ b/rust/kernel/drm/ioctl.rs
@@ -134,7 +134,8 @@ macro_rules! declare_drm_ioctls {
                             // FIXME: Currently there is nothing enforcing that the types of the
                             // dev/file match the current driver these ioctls are being declared
                             // for, and it's not clear how to enforce this within the type system.
-                            let dev = $crate::drm::device::Device::from_raw(raw_dev);
+                            let dev: &$crate::drm::device::Device<_, $crate::drm::Normal> =
+                                $crate::drm::device::Device::from_raw(raw_dev);
 
                             // Enforce that the handler accepts higher-ranked
                             // lifetimes, preventing it from requiring 'static
-- 
2.54.0