From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4036CC4321E for ; Mon, 5 Dec 2022 21:05:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233079AbiLEVFd (ORCPT ); Mon, 5 Dec 2022 16:05:33 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33458 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233708AbiLEVEs (ORCPT ); Mon, 5 Dec 2022 16:04:48 -0500 Received: from mail-pf1-x42b.google.com (mail-pf1-x42b.google.com [IPv6:2607:f8b0:4864:20::42b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 173CB10F; Mon, 5 Dec 2022 13:04:21 -0800 (PST) Received: by mail-pf1-x42b.google.com with SMTP id c13so5505490pfp.5; Mon, 05 Dec 2022 13:04:21 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=TpZoCNuVtqWmqXfOBYxoJCLHU/tCYzYlfr7fdZ1HLBU=; b=PC0oDyi/tmGrc1uhDSRSEHyMY+H+R9uB+dmHF3Y35EYWmpVS2VY+Xrv+sssREll6lq KttFq0viN82AH9/OKk8DWaa5QQK5ITu/FGFnPaWo9T5LoNcWu4JgQ/t7xCCmrcFH/YqH ga0N38vcc6CnlDsoxLkPblh8QNaxgUeBdq48dpKPheV6rGGoymBeHbxEYLJykrEqyvnx taVNEOLElceyej6h+5pnu+EXV1mO/UBcm0nW7pzjXmi15UfUryXUkLjuufdfbShiAjYf L++8MxBQTBq4c7EwPMxFF0V1lCVC19SK/3ArAuunrKXHJhV1ub+9rk8sTm/wuR9MxKUV hiMQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=TpZoCNuVtqWmqXfOBYxoJCLHU/tCYzYlfr7fdZ1HLBU=; b=V7MrBsWYPCjhQRkotbS3yDL4rOl1zi4xbIcnf+bVupPNVrvq8i+RPzkmvUXdziyyQU gtXsPuYmnZLw1mi32NPo0AqRpK7jFDPTCQ/LfX5HywOmclwqsDsxPv8fRUryPyjO5aQO UJ/50/LHd/+hDw8FbDn/drycsB+U0mgefWOdYbth6XpXGMnnx1EB8M1FbdNPrht40Fnw Pfl0tEi9RxDMf/yvvtYszg0IA6PR7b2Dh4tGjz9ymBvSALiMjWW5Pp+b41m/HY2+KOn5 PfM+DFnZMg8dqNJZMwDSJYBDYmTaV8NOCVTsY+m3J3glwov/XJm7w6wY+ykuJSVE/RFT UobQ== X-Gm-Message-State: ANoB5pkpbsOxs55nzua0L2xwpA3PUtFIMoGTUu1IK+/RygB7ADYQJrkI LitVxDpUXgKz3DHmVnl/TvEi+OLBKjM= X-Google-Smtp-Source: AA0mqf7BOcx8t21C04DWALOygV4H7r6nlIrgg9PhDxbAEYd1rUS67q8msfI3NTisCzD6lpfLLjlSNQ== X-Received: by 2002:a63:ea17:0:b0:477:9a46:f57b with SMTP id c23-20020a63ea17000000b004779a46f57bmr58686536pgi.319.1670274260086; Mon, 05 Dec 2022 13:04:20 -0800 (PST) Received: from charizard.lan (c-67-183-167-205.hsd1.wa.comcast.net. [67.183.167.205]) by smtp.gmail.com with ESMTPSA id b13-20020a170903228d00b0017ec1b1bf9fsm3209863plh.217.2022.12.05.13.04.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 05 Dec 2022 13:04:19 -0800 (PST) From: Andrey Smirnov To: linux-input@vger.kernel.org Cc: Andrey Smirnov , David Rheinsberg , Jiri Kosina , Benjamin Tissoires , linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org Subject: [RFC PATCH 2/2] HID: usbhid: Don't include report ID zero into returned data Date: Mon, 5 Dec 2022 13:03:54 -0800 Message-Id: <20221205210354.11846-3-andrew.smirnov@gmail.com> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20221205210354.11846-1-andrew.smirnov@gmail.com> References: <20221205210354.11846-1-andrew.smirnov@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Report ID of zero is a special case for ID-less reports, which by definition do not have report ID as a part of their payload. Not returning an extra zero also matches hidraw documentation, specifically: For devices which do not use numbered reports, set the first byte to 0. The returned report buffer will contain the report number in the first byte, followed by the report data read from the device. For devices which do not use numbered reports, the report data will begin at the first byte of the returned buffer. Cc: David Rheinsberg Cc: Jiri Kosina Cc: Benjamin Tissoires Cc: linux-input@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: linux-usb@vger.kernel.org Signed-off-by: Andrey Smirnov --- drivers/hid/usbhid/hid-core.c | 14 -------------- 1 file changed, 14 deletions(-) diff --git a/drivers/hid/usbhid/hid-core.c b/drivers/hid/usbhid/hid-core.c index be4c731aaa65..575f09003602 100644 --- a/drivers/hid/usbhid/hid-core.c +++ b/drivers/hid/usbhid/hid-core.c @@ -874,18 +874,8 @@ static int usbhid_get_raw_report(struct hid_device *hid, struct usb_device *dev = hid_to_usb_dev(hid); struct usb_interface *intf = usbhid->intf; struct usb_host_interface *interface = intf->cur_altsetting; - int skipped_report_id = 0; int ret; - /* Byte 0 is the report number. Report data starts at byte 1.*/ - buf[0] = report_number; - if (report_number == 0x0) { - /* Offset the return buffer by 1, so that the report ID - will remain in byte 0. */ - buf++; - count--; - skipped_report_id = 1; - } ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), HID_REQ_GET_REPORT, USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE, @@ -893,10 +883,6 @@ static int usbhid_get_raw_report(struct hid_device *hid, interface->desc.bInterfaceNumber, buf, count, USB_CTRL_SET_TIMEOUT); - /* count also the report id */ - if (ret > 0 && skipped_report_id) - ret++; - return ret; } -- 2.34.1