io_uring: remove unnecessary PF_EXITING check

We prefer nornal task_works even if it would fail requests inside. Kill
a PF_EXITING check in io_req_task_work_add(), task_work_add() handles
well dying tasks, i.e. return error when can't enqueue due to late
stages of do_exit().

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/fc14297e8441cd8f5d1743a2488cf0df09bf48ac.1628471125.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 1a7c91e..620ab4c 100644 (file)
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -2006,8 +2006,6 @@ static void io_req_task_work_add(struct io_kiocb *req)
        if (test_bit(0, &tctx->task_state) ||
            test_and_set_bit(0, &tctx->task_state))
                return;
-       if (unlikely(tsk->flags & PF_EXITING))
-               goto fail;
 
        /*
         * SQPOLL kernel thread doesn't need notification, just a wakeup. For
@@ -2020,7 +2018,7 @@ static void io_req_task_work_add(struct io_kiocb *req)
                wake_up_process(tsk);
                return;
        }
-fail:
+
        clear_bit(0, &tctx->task_state);
        spin_lock_irqsave(&tctx->task_lock, flags);
        node = tctx->task_list.first;