io_uring: refactor __io_req_complete_post

Keep parts of __io_req_complete_post() relying on req->flags together so
the value can be cached.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/2b4fbb42f404a0e75c4d9f0a5b16f314a839d0a9.1673887636.git.asml.silence@gmail.comSigned-off-by: Jens Axboe <axboe@kernel.dk>

io_uring/io_uring.c

@@ -974,14 +974,14 @@ static void __io_req_complete_post(struct io_kiocb *req)
 				req->link = NULL;
 			}
 		}
+		io_put_kbuf_comp(req);
+		io_dismantle_req(req);
 		io_req_put_rsrc(req);
 		/*
 		 * Selected buffer deallocation in io_clean_op() assumes that
 		 * we don't hold ->completion_lock. Clean them here to avoid
 		 * deadlocks.
 		 */
-		io_put_kbuf_comp(req);
-		io_dismantle_req(req);
 		io_put_task(req->task, 1);
 		wq_list_add_head(&req->comp_list, &ctx->locked_free_list);
 		ctx->locked_free_nr++;