linux-kernel - [PATCH] aio: Fix incorrect usage of eventfd_signal

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Message-Id: <20210913111928.98-1-xieyongji@bytedance.com>
Date:   Mon, 13 Sep 2021 19:19:28 +0800
From:   Xie Yongji <xieyongji@...edance.com>
To:     bcrl@...ck.org, viro@...iv.linux.org.uk, tglx@...utronix.de,
        axboe@...nel.dk
Cc:     linux-aio@...ck.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] aio: Fix incorrect usage of eventfd_signal_allowed()

We should defer eventfd_signal() to the workqueue when
eventfd_signal_allowed() return false rather than return
true.

Fixes: b542e383d8c0 ("eventfd: Make signal recursion protection a task bit")
Signed-off-by: Xie Yongji <xieyongji@...edance.com>
---
 fs/aio.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/aio.c b/fs/aio.c
index 51b08ab01dff..8822e3ed4566 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -1695,7 +1695,7 @@ static int aio_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync,
 		list_del(&iocb->ki_list);
 		iocb->ki_res.res = mangle_poll(mask);
 		req->done = true;
-		if (iocb->ki_eventfd && eventfd_signal_allowed()) {
+		if (iocb->ki_eventfd && !eventfd_signal_allowed()) {
 			iocb = NULL;
 			INIT_WORK(&req->work, aio_poll_put_work);
 			schedule_work(&req->work);
-- 
2.11.0