[PATCH 5/6] io_uring/futex: ensure partial wakes are appropriately dequeued

[Jens Axboe <axboe@kernel.dk>]

If a FUTEX_WAITV vectored operation is only partially woken, we
should call __futex_wake_mark() on the queue to account for that.
If not, then a later wakeup will wake the same entry, rather than
the next one in line.

Fixes: 8f350194d5cfd ("io_uring: add support for vectored futex waits")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 io_uring/futex.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/io_uring/futex.c b/io_uring/futex.c
index fd503c24b428..9cc1788ef4c6 100644
--- a/io_uring/futex.c
+++ b/io_uring/futex.c
@@ -159,8 +159,10 @@ static void io_futex_wakev_fn(struct wake_q_head *wake_q, struct futex_q *q)
 	struct io_kiocb *req = q->wake_data;
 	struct io_futexv_data *ifd = req->async_data;
 
-	if (!io_futexv_claim(ifd))
+	if (!io_futexv_claim(ifd)) {
+		__futex_wake_mark(q);
 		return;
+	}
 	if (unlikely(!__futex_wake_mark(q)))
 		return;
 
-- 
2.53.0