linux-kernel - [PATCH stable-5.10] io_uring: fix clear IORING_SETUP_R

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Date:   Thu, 15 Jul 2021 21:18:25 +0800
From:   Yang Yingliang <yangyingliang@...wei.com>
To:     <linux-kernel@...r.kernel.org>, <stable@...r.kernel.org>
CC:     <gregkh@...uxfoundation.org>, <axboe@...nel.dk>
Subject: [PATCH stable-5.10] io_uring: fix clear IORING_SETUP_R_DISABLED in wrong function

In commit 3ebba796fa25 ("io_uring: ensure that SQPOLL thread is started for exit"),
the IORING_SETUP_R_DISABLED is cleared in io_sq_offload_start(), but when backport
it to stable-5.10, IORING_SETUP_R_DISABLED is cleared in __io_req_task_submit(),
move clearing IORING_SETUP_R_DISABLED to io_sq_offload_start() to fix this.

Fixes: 6cae8095490ca ("io_uring: ensure that SQPOLL thread is started for exit")
Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
---
 fs/io_uring.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index fdbaaf579cc60..57db1dfc35829 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -2086,7 +2086,6 @@ static void __io_req_task_submit(struct io_kiocb *req)
 		__io_req_task_cancel(req, -EFAULT);
 	mutex_unlock(&ctx->uring_lock);
 
-	ctx->flags &= ~IORING_SETUP_R_DISABLED;
 	if (ctx->flags & IORING_SETUP_SQPOLL)
 		io_sq_thread_drop_mm();
 }
@@ -7998,6 +7997,7 @@ static void io_sq_offload_start(struct io_ring_ctx *ctx)
 {
 	struct io_sq_data *sqd = ctx->sq_data;
 
+	ctx->flags &= ~IORING_SETUP_R_DISABLED;
 	if ((ctx->flags & IORING_SETUP_SQPOLL) && sqd->thread)
 		wake_up_process(sqd->thread);
 }
-- 
2.25.1