Andreas Hindborg 06dad60393 rust: block: implement Send and Sync for TagSet ...

`TagSet` never implemented `Send` or `Sync`. This did not matter until
commit "rust: block: fix `Send` bound for `GenDisk`" made `GenDisk: Send`
depend on `Arc<TagSet<T>>: Send`, which in turn requires `TagSet<T>: Send +
Sync`. With that bound unsatisfiable, `GenDisk` is never `Send`, and the
rnull driver fails to build once configfs requires `GroupOperations::Child:
Send`.

`TagSet` owns no data typed by `T`. It only wraps the C `struct
blk_mq_tag_set`, which can be dropped from any thread by calling
`blk_mq_free_tag_set`. Thus, implement `Send` and `Sync` for `TagSet`
unconditionally.

Reported-by: Thorsten Leemhuis <linux@leemhuis.info>
Closes: https://lore.kernel.org/r/d1381ed8-eab8-4fd7-8b15-1e94876d7099@leemhuis.info
Suggested-by: Gary Guo <gary@garyguo.net>
Signed-off-by: Andreas Hindborg <a.hindborg@kernel.org>
Tested-by: Thorsten Leemhuis <linux@leemhuis.info>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Link: https://patch.msgid.link/20260930-tag-set-send-sync-v1-1-51acdb36f4bb@kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>

2026-10-01 07:53:55 -06:00

..

mq

rust: block: implement Send and Sync for TagSet

2026-10-01 07:53:55 -06:00

mq.rs

rust: block: update ARef and AlwaysRefCounted imports from sync::aref

2025-11-05 18:24:10 -07:00