From: Jens Axboe <axboe@kernel.dk>
Date: Mon, 20 Apr 2026 20:24:50 +0000 (-0600)
Subject: io_uring/futex: ensure partial wakes are appropriately dequeued
X-Git-Tag: v7.1-rc1~11^2~6
X-Git-Url: http://git.ipfire.org/gitweb/?a=commitdiff_plain;h=7faaa6812aba550c24bffdfd9399568223c8a477;p=thirdparty%2Fkernel%2Flinux.git

io_uring/futex: ensure partial wakes are appropriately dequeued

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")
Reviewed-by: Gabriel Krisman Bertazi <krisman@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---

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;