Commit 9cb0073b authored by Pavel Begunkov's avatar Pavel Begunkov Committed by Jens Axboe
Browse files

io_uring: pin ctx on fallback execution 



Pin ring in io_fallback_req_func() by briefly elevating ctx->refs in
case any task_work handler touches ctx after releasing a request.

Fixes: 9011bf9a ("io_uring: fix stuck fallback reqs")
Signed-off-by: default avatarPavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/833a494713d235ec144284a9bbfe418df4f6b61c.1629235576.git.asml.silence@gmail.com


Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 21f96522

fs/io_uring.c

+2 −0
Original line number Diff line number Diff line
@@ -2477,8 +2477,10 @@ static void io_fallback_req_func(struct work_struct *work) 
	struct llist_node *node = llist_del_all(&ctx->fallback_llist);

	struct io_kiocb *req, *tmp;



	percpu_ref_get(&ctx->refs);

	llist_for_each_entry_safe(req, tmp, node, io_task_work.fallback_node)

		req->io_task_work.func(req);

	percpu_ref_put(&ctx->refs);

}



static void __io_complete_rw(struct io_kiocb *req, long res, long res2,