From: Jens Axboe <axboe@xxxxxxxxx>
Commit f58680085478dd292435727210122960d38e8014 upstream.
If CONFIG_PREEMPT_NONE is set and the task_work chains are long, we
could be running into issues blocking others for too long. Add a
reschedule check in handle_tw_list(), and flush the ctx if we need to
reschedule.
Cc: stable@xxxxxxxxxxxxxxx # 5.10+
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
io_uring/io_uring.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -2217,9 +2217,12 @@ static void tctx_task_work(struct callba
}
req->io_task_work.func(req, &locked);
node = next;
+ if (unlikely(need_resched())) {
+ ctx_flush_and_put(ctx, &locked);
+ ctx = NULL;
+ cond_resched();
+ }
} while (node);
-
- cond_resched();
}
ctx_flush_and_put(ctx, &locked);
