From: Pavel Begunkov <asml.silence@xxxxxxxxx> [ Upstream commit 4ee3631451c9a62e6b6bc7ee51fb9a5b34e33509 ] io_req_defer() do double-checked locking. Use proper helpers for that, i.e. list_empty_careful(). Signed-off-by: Pavel Begunkov <asml.silence@xxxxxxxxx> Signed-off-by: Jens Axboe <axboe@xxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- fs/io_uring.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/io_uring.c b/fs/io_uring.c index 01f71b9efb88f..832e042531bc4 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -4258,7 +4258,7 @@ 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)) -- 2.20.1
