io_uring: recycle kbuf recycle on tw requeue

When we queue a request via tw for execution it's not going to be
executed immediately, so when io_queue_async() hits IO_APOLL_READY
and queues a tw but doesn't try to recycle/consume the buffer some other
request may try to use the the buffer.

Fixes: c7fb194 ("io_uring: add support for ring mapped supplied buffers")
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/a19bc9e211e3184215a58e129b62f440180e9212.1662480490.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Author: isilence

io_uring/io_uring.c

@@ -1728,6 +1728,7 @@ static void io_queue_async(struct io_kiocb *req, int ret)
 
 	switch (io_arm_poll_handler(req, 0)) {
 	case IO_APOLL_READY:
+		io_kbuf_recycle(req, 0);
 		io_req_task_queue(req);
 		break;
 	case IO_APOLL_ABORTED: