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From 771eede6339e4ab3444babfcc66d93f4c38a78c3 Mon Sep 17 00:00:00 2001
From: Xie Yongji <xieyongji@bytedance.com>
Date: Mon, 13 Sep 2021 19:19:28 +0800
Subject: [PATCH 312/323] aio: Fix incorrect usage of eventfd_signal_allowed()
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/5.10/older/patches-5.10.215-rt107.tar.xz
commit 4b3749865374899e115aa8c48681709b086fe6d3 upstream.
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@bytedance.com>
Link: https://lore.kernel.org/r/20210913111928.98-1-xieyongji@bytedance.com
Reviewed-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Luis Claudio R. Goncalves <lgoncalv@redhat.com>
---
fs/aio.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/aio.c b/fs/aio.c
index 7030157e99338..0f02ea16305cf 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -1776,7 +1776,7 @@ static int aio_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync,
list_del_init(&req->wait.entry);
list_del(&iocb->ki_list);
iocb->ki_res.res = mangle_poll(mask);
- 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);
--
2.44.0
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