Commit 4ee36314 authored by Pavel Begunkov's avatar Pavel Begunkov Committed by Jens Axboe
Browse files

io_uring: check non-sync defer_list carefully 



io_req_defer() do double-checked locking. Use proper helpers for that,
i.e. list_empty_careful().

Signed-off-by: default avatarPavel Begunkov <asml.silence@gmail.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 7759a0bf

fs/io_uring.c

+1 −1
Original line number Diff line number Diff line
@@ -5031,7 +5031,7 @@ static int io_req_defer(struct io_kiocb *req, const struct io_uring_sqe *sqe) 
	int ret;



	/* Still need defer if there is pending req in defer list. */

	if (!req_need_defer(req) && list_empty(&ctx->defer_list))

	if (!req_need_defer(req) && list_empty_careful(&ctx->defer_list))

		return 0;



	if (!req->io && io_alloc_async_ctx(req))