6.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Jens Axboe <axboe@xxxxxxxxx>
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@xxxxxxxxxxxxxxx
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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;
}
