Alice Ryhl 6fcd6feaf1 rust: sync: require T: Sync for LockedBy::access ... commit a8ee30f45d upstream. The `LockedBy::access` method only requires a shared reference to the owner, so if we have shared access to the `LockedBy` from several threads at once, then two threads could call `access` in parallel and both obtain a shared reference to the inner value. Thus, require that `T: Sync` when calling the `access` method. An alternative is to require `T: Sync` in the `impl Sync for LockedBy`. This patch does not choose that approach as it gives up the ability to use `LockedBy` with `!Sync` types, which is okay as long as you only use `access_mut`. Cc: stable@vger.kernel.org Fixes: 7b1f55e3a9 ("rust: sync: introduce `LockedBy`") Signed-off-by: Alice Ryhl <aliceryhl@google.com> Suggested-by: Boqun Feng <boqun.feng@gmail.com> Reviewed-by: Gary Guo <gary@garyguo.net> Link: https://lore.kernel.org/r/20240915-locked-by-sync-fix-v2-1-1a8d89710392@google.com Signed-off-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2024-10-10 11:57:44 +02:00
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arc	rust: sync: arc: Implement Arc<dyn Any + Send + Sync>::downcast()	2023-04-10 23:55:43 +02:00
lock	rust: sync: make doctests compilable/testable	2023-07-19 09:32:41 -06:00
arc.rs	rust: arc: add explicit drop() around Box::from_raw()	2024-02-16 19:10:43 +01:00
condvar.rs	rust: sync: introduce CondVar	2023-04-22 01:46:45 +02:00
lock.rs	rust: lock: Add intra-doc links to the Backend trait	2023-08-07 11:33:33 +02:00
locked_by.rs	rust: sync: require T: Sync for LockedBy::access	2024-10-10 11:57:44 +02:00