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io_uring/futex: ensure partial wakes are appropriately dequeued

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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: 8f350194d5 ("io_uring: add support for vectored futex waits")
Reviewed-by: Gabriel Krisman Bertazi <krisman@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2026-04-20 14:24:50 -06:00
parent 7996883455
commit 7faaa6812a
1 changed files with 3 additions and 1 deletions
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4
io_uring/futex.c
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@ -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_kiocb *req = q->wake_data;
struct io_futexv_data *ifd = req->async_data; struct io_futexv_data *ifd = req->async_data;
if (!io_futexv_claim(ifd)) if (!io_futexv_claim(ifd)) {
__futex_wake_mark(q);
return; return;
}
if (unlikely(!__futex_wake_mark(q))) if (unlikely(!__futex_wake_mark(q)))
return; return;