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Diffstat (limited to 'rust/kernel/sync/lock.rs')
| -rw-r--r-- | rust/kernel/sync/lock.rs | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/rust/kernel/sync/lock.rs b/rust/kernel/sync/lock.rs index 72dbf3fbb259..eb80048e0110 100644 --- a/rust/kernel/sync/lock.rs +++ b/rust/kernel/sync/lock.rs @@ -90,6 +90,13 @@ pub unsafe trait Backend { // SAFETY: The safety requirements ensure that the lock is initialised. *guard_state = unsafe { Self::lock(ptr) }; } + + /// Asserts that the lock is held using lockdep. + /// + /// # Safety + /// + /// Callers must ensure that [`Backend::init`] has been previously called. + unsafe fn assert_is_held(ptr: *mut Self::State); } /// A mutual exclusion primitive. @@ -235,6 +242,9 @@ impl<'a, T: ?Sized, B: Backend> Guard<'a, T, B> { /// /// The caller must ensure that it owns the lock. pub unsafe fn new(lock: &'a Lock<T, B>, state: B::GuardState) -> Self { + // SAFETY: The caller can only hold the lock if `Backend::init` has already been called. + unsafe { B::assert_is_held(lock.state.get()) }; + Self { lock, state, |