diff options
Diffstat (limited to 'rust/kernel/types.rs')
| -rw-r--r-- | rust/kernel/types.rs | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/rust/kernel/types.rs b/rust/kernel/types.rs index 9e7ca066355c..070d03152937 100644 --- a/rust/kernel/types.rs +++ b/rust/kernel/types.rs @@ -299,6 +299,22 @@ impl<T> Opaque<T> { } } + /// Creates a fallible pin-initializer from the given initializer closure. + /// + /// The returned initializer calls the given closure with the pointer to the inner `T` of this + /// `Opaque`. Since this memory is uninitialized, the closure is not allowed to read from it. + /// + /// This function is safe, because the `T` inside of an `Opaque` is allowed to be + /// uninitialized. Additionally, access to the inner `T` requires `unsafe`, so the caller needs + /// to verify at that point that the inner value is valid. + pub fn try_ffi_init<E>( + init_func: impl FnOnce(*mut T) -> Result<(), E>, + ) -> impl PinInit<Self, E> { + // SAFETY: We contain a `MaybeUninit`, so it is OK for the `init_func` to not fully + // initialize the `T`. + unsafe { init::pin_init_from_closure::<_, E>(move |slot| init_func(Self::raw_get(slot))) } + } + /// Returns a raw pointer to the opaque data. pub const fn get(&self) -> *mut T { UnsafeCell::get(&self.value).cast::<T>() |