diff options
| author | Jens Axboe <axboe@kernel.dk> | 2026-03-09 23:35:49 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2026-03-11 23:35:19 +0300 |
| commit | 177c69432161f6e4bab07ccacf8a1748a6898a6b (patch) | |
| tree | 3876666f26a48ace76bf5b17dcaf19853a3cf34b | |
| parent | 96189080265e6bb5dde3a4afbaf947af493e3f82 (diff) | |
| download | linux-177c69432161f6e4bab07ccacf8a1748a6898a6b.tar.xz | |
io_uring/eventfd: use ctx->rings_rcu for flags checking
Similarly to what commit e78f7b70e837 did for local task work additions,
use ->rings_rcu under RCU rather than dereference ->rings directly. See
that commit for more details.
Cc: stable@vger.kernel.org
Fixes: 79cfe9e59c2a ("io_uring/register: add IORING_REGISTER_RESIZE_RINGS")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
| -rw-r--r-- | io_uring/eventfd.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/io_uring/eventfd.c b/io_uring/eventfd.c index 78f8ab7db104..ab789e1ebe91 100644 --- a/io_uring/eventfd.c +++ b/io_uring/eventfd.c @@ -76,11 +76,15 @@ void io_eventfd_signal(struct io_ring_ctx *ctx, bool cqe_event) { bool skip = false; struct io_ev_fd *ev_fd; - - if (READ_ONCE(ctx->rings->cq_flags) & IORING_CQ_EVENTFD_DISABLED) - return; + struct io_rings *rings; guard(rcu)(); + + rings = rcu_dereference(ctx->rings_rcu); + if (!rings) + return; + if (READ_ONCE(rings->cq_flags) & IORING_CQ_EVENTFD_DISABLED) + return; ev_fd = rcu_dereference(ctx->io_ev_fd); /* * Check again if ev_fd exists in case an io_eventfd_unregister call |