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

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Message-ID: <CACycT3ugx-wwPVb+Euzhj6hWn0fXO+jvfsUCew6v1iBaB8SZsQ@mail.gmail.com>
Date:   Sun, 14 Nov 2021 15:15:17 +0800
From:   Yongji Xie <xieyongji@...edance.com>
To:     bcrl@...ck.org, Al Viro <viro@...iv.linux.org.uk>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jens Axboe <axboe@...nel.dk>
Cc:     linux-aio@...ck.org, linux-fsdevel@...r.kernel.org,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] aio: Fix incorrect usage of eventfd_signal_allowed()

Ping

On Mon, Sep 13, 2021 at 7:20 PM Xie Yongji <xieyongji@...edance.com> wrote:
>
> 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
>