6.9-stable review patch. If anyone has any objections, please let me know.
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From: Jens Axboe axboe@kernel.dk
commit dbcabac138fdfc730ba458ed2199ff1f29a271fc upstream.
Before SQPOLL was transitioned to managing its own task_work, the core used TWA_SIGNAL_NO_IPI to ensure that task_work was processed. If not, we can't be sure that all task_work is processed at SQPOLL thread exit time.
Fixes: af5d68f8892f ("io_uring/sqpoll: manage task_work privately") Cc: stable@vger.kernel.org Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- io_uring/io_uring.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/io_uring/io_uring.c +++ b/io_uring/io_uring.c @@ -1374,8 +1374,8 @@ static void io_req_normal_work_add(struc if (ctx->flags & IORING_SETUP_SQPOLL) { struct io_sq_data *sqd = ctx->sq_data;
- if (wq_has_sleeper(&sqd->wait)) - wake_up(&sqd->wait); + if (sqd->thread) + __set_notify_signal(sqd->thread); return; }