linux-kernel - [PATCH 5.13 248/351] io_uring: remove not needed PF

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Date:   Mon, 19 Jul 2021 16:53:14 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Pavel Begunkov <asml.silence@...il.com>,
        Jens Axboe <axboe@...nel.dk>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.13 248/351] io_uring: remove not needed PF_EXITING check

From: Pavel Begunkov <asml.silence@...il.com>

[ Upstream commit e5dc480d4ed9884274e95c757fa2d2e9cc1047ee ]

Since cancellation got moved before exit_signals(), there is no one left
who can call io_run_task_work() with PF_EXIING set, so remove the check.
Note that __io_req_task_submit() still needs a similar check.

Signed-off-by: Pavel Begunkov <asml.silence@...il.com>
Link: https://lore.kernel.org/r/f7f305ececb1e6044ea649fb983ca754805bb884.1624739600.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/io_uring.c | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 262e6748c88a..eeea6b8c8bee 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -2227,12 +2227,6 @@ static inline unsigned int io_put_rw_kbuf(struct io_kiocb *req)
 
 static inline bool io_run_task_work(void)
 {
-	/*
-	 * Not safe to run on exiting task, and the task_work handling will
-	 * not add work to such a task.
-	 */
-	if (unlikely(current->flags & PF_EXITING))
-		return false;
 	if (current->task_works) {
 		__set_current_state(TASK_RUNNING);
 		task_work_run();
@@ -8958,7 +8952,8 @@ static void io_uring_try_cancel_requests(struct io_ring_ctx *ctx,
 		ret |= io_cancel_defer_files(ctx, task, cancel_all);
 		ret |= io_poll_remove_all(ctx, task, cancel_all);
 		ret |= io_kill_timeouts(ctx, task, cancel_all);
-		ret |= io_run_task_work();
+		if (task)
+			ret |= io_run_task_work();
 		ret |= io_run_ctx_fallback(ctx);
 		if (!ret)
 			break;
-- 
2.30.2