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Diffstat (limited to 'rust/kernel/device.rs')
| -rw-r--r-- | rust/kernel/device.rs | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/rust/kernel/device.rs b/rust/kernel/device.rs index d527ceef829e..b6b81546a0da 100644 --- a/rust/kernel/device.rs +++ b/rust/kernel/device.rs @@ -60,6 +60,25 @@ impl Device { // SAFETY: By the safety requirements ptr is valid unsafe { Self::as_ref(ptr) }.into() } + + /// Convert a [`&Device`](Device) into a [`&Device<Bound>`](Device<Bound>). + /// + /// # Safety + /// + /// The caller is responsible to ensure that the returned [`&Device<Bound>`](Device<Bound>) + /// only lives as long as it can be guaranteed that the [`Device`] is actually bound. + pub unsafe fn as_bound(&self) -> &Device<Bound> { + let ptr = core::ptr::from_ref(self); + + // CAST: By the safety requirements the caller is responsible to guarantee that the + // returned reference only lives as long as the device is actually bound. + let ptr = ptr.cast(); + + // SAFETY: + // - `ptr` comes from `from_ref(self)` above, hence it's guaranteed to be valid. + // - Any valid `Device` pointer is also a valid pointer for `Device<Bound>`. + unsafe { &*ptr } + } } impl Device<CoreInternal> { |