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| author | Jens Axboe <axboe@kernel.dk> | 2022-11-20 10:18:45 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2022-11-22 06:08:31 -0700 |
| commit | 4464853277d0ccdb9914608dd1332f0fa2f9846f (patch) | |
| tree | 3c1df058d34a9852a6623d6db533eeb5c0525dde /io_uring/io_uring.c | |
| parent | 03e02acda8e267a8183e1e0ed289ff1ef9cd7ed8 (diff) | |
| download | linux-4464853277d0ccdb9914608dd1332f0fa2f9846f.tar.bz2 | |
io_uring: pass in EPOLL_URING_WAKE for eventfd signaling and wakeups
Pass in EPOLL_URING_WAKE when signaling eventfd or doing poll related
wakups, so that we can check for a circular event dependency between
eventfd and epoll. If this flag is set when our wakeup handlers are
called, then we know we have a dependency that needs to terminate
multishot requests.
eventfd and epoll are the only such possible dependencies.
Cc: stable@vger.kernel.org # 6.0
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'io_uring/io_uring.c')
| -rw-r--r-- | io_uring/io_uring.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c index 1299f9c8567a..762ecab801f2 100644 --- a/io_uring/io_uring.c +++ b/io_uring/io_uring.c @@ -495,7 +495,7 @@ static void io_eventfd_ops(struct rcu_head *rcu) int ops = atomic_xchg(&ev_fd->ops, 0); if (ops & BIT(IO_EVENTFD_OP_SIGNAL_BIT)) - eventfd_signal(ev_fd->cq_ev_fd, 1); + eventfd_signal_mask(ev_fd->cq_ev_fd, 1, EPOLL_URING_WAKE); /* IO_EVENTFD_OP_FREE_BIT may not be set here depending on callback * ordering in a race but if references are 0 we know we have to free @@ -531,7 +531,7 @@ static void io_eventfd_signal(struct io_ring_ctx *ctx) goto out; if (likely(eventfd_signal_allowed())) { - eventfd_signal(ev_fd->cq_ev_fd, 1); + eventfd_signal_mask(ev_fd->cq_ev_fd, 1, EPOLL_URING_WAKE); } else { atomic_inc(&ev_fd->refs); if (!atomic_fetch_or(BIT(IO_EVENTFD_OP_SIGNAL_BIT), &ev_fd->ops)) |