From 771eede6339e4ab3444babfcc66d93f4c38a78c3 Mon Sep 17 00:00:00 2001 From: Xie Yongji 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 Link: https://lore.kernel.org/r/20210913111928.98-1-xieyongji@bytedance.com Reviewed-by: Eric Biggers Signed-off-by: Eric Biggers Signed-off-by: Luis Claudio R. Goncalves --- 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