From patchwork Wed Sep 1 16:36:06 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alan Stern X-Patchwork-Id: 505437 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.2 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 50E87C4320A for ; Wed, 1 Sep 2021 16:36:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 370DF61008 for ; Wed, 1 Sep 2021 16:36:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S245426AbhIAQhI (ORCPT ); Wed, 1 Sep 2021 12:37:08 -0400 Received: from netrider.rowland.org ([192.131.102.5]:49567 "HELO netrider.rowland.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S245316AbhIAQhE (ORCPT ); Wed, 1 Sep 2021 12:37:04 -0400 Received: (qmail 405992 invoked by uid 1000); 1 Sep 2021 12:36:06 -0400 Date: Wed, 1 Sep 2021 12:36:06 -0400 From: Alan Stern To: Benjamin Tissoires , Jiri Kosina Cc: Michal Kubecek , Oleksandr Natalenko , linux-input@vger.kernel.org, Linux USB Mailing List Subject: [PATCH 3/3] HID: usbhid: Simplify code in hid_submit_ctrl() Message-ID: <20210901163606.GC404634@rowland.harvard.edu> MIME-Version: 1.0 Content-Disposition: inline User-Agent: Mutt/1.10.1 (2018-07-13) Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org This patch makes a small simplification to the code in hid_submit_ctrl(). The test for maxpacket being > 0 is unnecessary, because endpoint 0 always has a maxpacket value which is >= 8. Furthermore, endpoint 0's maxpacket value is always a power of 2, so instead of open-coding the round-to-next-multiple computation we can call the optimized round_up() routine. Signed-off-by: Alan Stern Tested-by: Benjamin Tissoires Acked-by: Benjamin Tissoires --- drivers/hid/usbhid/hid-core.c | 12 ++++-------- 1 file changed, 4 insertions(+), 8 deletions(-) Index: usb-devel/drivers/hid/usbhid/hid-core.c =================================================================== --- usb-devel.orig/drivers/hid/usbhid/hid-core.c +++ usb-devel/drivers/hid/usbhid/hid-core.c @@ -388,14 +388,10 @@ static int hid_submit_ctrl(struct hid_de usbhid->urbctrl->pipe = usb_rcvctrlpipe(hid_to_usb_dev(hid), 0); maxpacket = usb_maxpacket(hid_to_usb_dev(hid), usbhid->urbctrl->pipe, 0); - if (maxpacket > 0) { - len += (len == 0); /* Don't allow 0-length reports */ - len = DIV_ROUND_UP(len, maxpacket); - len *= maxpacket; - if (len > usbhid->bufsize) - len = usbhid->bufsize; - } else - len = 0; + len += (len == 0); /* Don't allow 0-length reports */ + len = round_up(len, maxpacket); + if (len > usbhid->bufsize) + len = usbhid->bufsize; } usbhid->urbctrl->transfer_buffer_length = len; usbhid->urbctrl->dev = hid_to_usb_dev(hid);