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The Rust configfs abstractions do not fully constrain callback data for
cross-thread use. Add the missing `Send` and `Sync` requirements.
Specifically, make the following changes:
1. Require `Data: Send` when implementing `Send` for `Subsystem<Data>`,
since the subsystem stores its data by value.
2. Make `GroupOperations` a `Sync` supertrait because `make_group` and
`drop_item` receive `&self` from foreign threads. Require `Child: Send`
because configfs may release child groups on an arbitrary thread.
3. Require `AttributeOperations::Data: Sync` because its callbacks receive
`&Data` from foreign threads.
4. Update the safety comments in FFI callbacks that call `get_group_data`
to cite these bounds as justification for sharing the returned
references with the callback thread.
5. Remove redundant `Child: 'static` bounds from `GroupOperationsVTable`
and `new_with_child_ctor`.
Fixes:
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|---|---|---|
| .. | ||
| bindings | ||
| helpers | ||
| kernel | ||
| macros | ||
| pin-init | ||
| proc-macro2 | ||
| quote | ||
| syn | ||
| uapi | ||
| zerocopy | ||
| zerocopy-derive | ||
| .gitignore | ||
| .kunitconfig | ||
| bindgen_parameters | ||
| build_error.rs | ||
| compiler_builtins.rs | ||
| exports.c | ||
| ffi.rs | ||
| Makefile | ||