| commit | 0d7bae69c574c5f25802f8a71252e7d66933a3ab | [log] [tgz] |
|---|---|---|
| author | Stefan Bühler <source@stbuehler.de> | Fri Apr 19 11:57:45 2019 +0200 |
| committer | Jens Axboe <axboe@kernel.dk> | Mon Apr 22 11:00:56 2019 -0600 |
| tree | 9c6bd0dd0456a51080c7ed95350768452385aecb | |
| parent | e523a29c4f2703bdb98f68ce1bb256e259fd8d5f [diff] |
io_uring: fix race condition when sq threads goes sleeping Reading the SQ tail needs to come after setting IORING_SQ_NEED_WAKEUP in flags; there is no cheap barrier for ordering a store before a load, a full memory barrier is required. Userspace needs a full memory barrier between updating SQ tail and checking for the IORING_SQ_NEED_WAKEUP too. Signed-off-by: Stefan Bühler <source@stbuehler.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>