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 X-Spam-Level: X-Spam-Status: No, score=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 6D9F9C43462 for ; Fri, 19 Mar 2021 17:10:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5A3DF61960 for ; Fri, 19 Mar 2021 17:10:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231182AbhCSRKD (ORCPT ); Fri, 19 Mar 2021 13:10:03 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33426 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230267AbhCSRJX (ORCPT ); Fri, 19 Mar 2021 13:09:23 -0400 Received: from mail-ej1-x632.google.com (mail-ej1-x632.google.com [IPv6:2a00:1450:4864:20::632]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9FEC1C06175F for ; Fri, 19 Mar 2021 10:09:22 -0700 (PDT) Received: by mail-ej1-x632.google.com with SMTP id k10so10892775ejg.0 for ; Fri, 19 Mar 2021 10:09:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=d2ao3XLmmt/D2986Jeu7tVcMUKwvKwTpzqsditCLfoQ=; b=QLyRRdN5eqUYoVXkXc6rjkGll8bcW3YLX0pAdu89oERxLmMOKJFCtwH5apNxHHFzzL UOEo2x+BrIzRTa3d7JEdSPBq9p2yX7VsFQWhlGTl7CS5Agodhj2DkI+f4dW0jP1QzRJ3 lJap5si7EUdosRLSwIQeUVex8Mwy6yr6Bxxls= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=d2ao3XLmmt/D2986Jeu7tVcMUKwvKwTpzqsditCLfoQ=; b=XFiOE4XcuArPuV9cGfnY6jZldBrJx0qjI9JLy2lXRJ4EL4jFSTOxLBAnKmGnN6N4xB w8Bn3r9wuhemWLWWb74IiH+6Pjech4nD6K8/4oTjJWvTHiy0lj83T+04rGRqQo8nVZaW EEyMPyq1A2saGeX4wT2y9+yNFkYyQxAqI2XSZurOmldYKbwEsG9FOemZw2Zsj49VllMZ 2OMNGgMwLEpwIxvhhCeFUzA1GMxjCc+lNAVGxf6xt3AlkKEgRFJa5srR3VHxSRuySlrg 1QmBDgu/6rzQtNm0wEnAsiNf1OBJ5Wdp196ThUcn2QTXKylS9msaDmtK5H11iyHGOPY+ TMxA== X-Gm-Message-State: AOAM5331jnvrH1+w6SNCr96beEJdqR37mdwaN8NbkdU8CswsrEpgnpE/ NtWYH53VHGLRLqUtFf3K1RMtbswG41R+Xr/Qfm8= X-Google-Smtp-Source: ABdhPJyd0wngx7F7lMWAKTe68oU3y87xOHQw/jTMe4pbGxKkj6ecbjHGz6I+0tyRzz6iGqSHpoNnGA== X-Received: by 2002:a17:906:1494:: with SMTP id x20mr5511578ejc.101.1616173761415; Fri, 19 Mar 2021 10:09:21 -0700 (PDT) Received: from alco.lan ([80.71.134.83]) by smtp.gmail.com with ESMTPSA id be27sm4506050edb.47.2021.03.19.10.09.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 19 Mar 2021 10:09:20 -0700 (PDT) From: Ricardo Ribalda To: Laurent Pinchart , Mauro Carvalho Chehab , Hans Verkuil , Sergey Senozhatsky , linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, tfiga@chromium.org Cc: Ricardo Ribalda Subject: [PATCH v8 16/19] media: uvcvideo: Return -EACCES to inactive controls Date: Fri, 19 Mar 2021 18:09:03 +0100 Message-Id: <20210319170906.278238-17-ribalda@chromium.org> X-Mailer: git-send-email 2.31.0.rc2.261.g7f71774620-goog In-Reply-To: <20210319170906.278238-1-ribalda@chromium.org> References: <20210319170906.278238-1-ribalda@chromium.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org If a control is inactive return -EACCES to let the userspace know that the value will not be applied automatically when the control is active again. Suggested-by: Hans Verkuil Signed-off-by: Ricardo Ribalda --- drivers/media/usb/uvc/uvc_ctrl.c | 71 +++++++++++++++++++++----------- 1 file changed, 48 insertions(+), 23 deletions(-) diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c index bcebf9d1a46f..d9d4add1e813 100644 --- a/drivers/media/usb/uvc/uvc_ctrl.c +++ b/drivers/media/usb/uvc/uvc_ctrl.c @@ -1082,13 +1082,36 @@ static const char *uvc_map_get_name(const struct uvc_control_mapping *map) return "Unknown Control"; } +static bool uvc_ctrl_is_inactive(struct uvc_video_chain *chain, + struct uvc_control *ctrl, + struct uvc_control_mapping *mapping) +{ + struct uvc_control_mapping *master_map = NULL; + struct uvc_control *master_ctrl = NULL; + s32 val; + int ret; + + if (!mapping->master_id) + return false; + + __uvc_find_control(ctrl->entity, mapping->master_id, &master_map, + &master_ctrl, 0); + + if (!master_ctrl || !(master_ctrl->info.flags & UVC_CTRL_FLAG_GET_CUR)) + return false; + + ret = __uvc_ctrl_get(chain, master_ctrl, master_map, &val); + if (ret < 0 || val == mapping->master_manual) + return false; + + return true; +} + static int __uvc_query_v4l2_ctrl(struct uvc_video_chain *chain, struct uvc_control *ctrl, struct uvc_control_mapping *mapping, struct v4l2_queryctrl *v4l2_ctrl) { - struct uvc_control_mapping *master_map = NULL; - struct uvc_control *master_ctrl = NULL; const struct uvc_menu_info *menu; unsigned int i; @@ -1104,18 +1127,8 @@ static int __uvc_query_v4l2_ctrl(struct uvc_video_chain *chain, if (!(ctrl->info.flags & UVC_CTRL_FLAG_SET_CUR)) v4l2_ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY; - if (mapping->master_id) - __uvc_find_control(ctrl->entity, mapping->master_id, - &master_map, &master_ctrl, 0); - if (master_ctrl && (master_ctrl->info.flags & UVC_CTRL_FLAG_GET_CUR)) { - s32 val; - int ret = __uvc_ctrl_get(chain, master_ctrl, master_map, &val); - if (ret < 0) - return ret; - - if (val != mapping->master_manual) - v4l2_ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE; - } + if (uvc_ctrl_is_inactive(chain, ctrl, mapping)) + v4l2_ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE; if (!ctrl->cached) { int ret = uvc_ctrl_populate_cache(chain, ctrl); @@ -1638,25 +1651,37 @@ static int uvc_ctrl_commit_entity(struct uvc_device *dev, return 0; } -static int uvc_ctrl_find_ctrlidx(struct uvc_entity *entity, +static int uvc_ctrl_commit_error(struct uvc_video_chain *chain, + struct uvc_entity *entity, struct v4l2_ext_controls *ctrls, - struct uvc_control *uvc_control) + struct uvc_control *err_control, + int ret) { struct uvc_control_mapping *mapping; struct uvc_control *ctrl_found; unsigned int i; - if (!entity) - return ctrls->count; + if (!entity) { + ctrls->error_idx = ctrls->count; + return ret; + } for (i = 0; i < ctrls->count; i++) { __uvc_find_control(entity, ctrls->controls[i].id, &mapping, &ctrl_found, 0); - if (uvc_control == ctrl_found) - return i; + if (err_control == ctrl_found) + break; } + ctrls->error_idx = i; + + /* We could not find the control that failed. */ + if (i == ctrls->count) + return ret; - return ctrls->count; + if (uvc_ctrl_is_inactive(chain, err_control, mapping)) + return -EACCES; + + return ret; } int __uvc_ctrl_commit(struct uvc_fh *handle, int rollback, @@ -1679,8 +1704,8 @@ int __uvc_ctrl_commit(struct uvc_fh *handle, int rollback, uvc_ctrl_send_events(handle, ctrls->controls, ctrls->count); done: if (ret < 0 && ctrls) - ctrls->error_idx = uvc_ctrl_find_ctrlidx(entity, ctrls, - err_ctrl); + ret = uvc_ctrl_commit_error(chain, entity, ctrls, err_ctrl, + ret); mutex_unlock(&chain->ctrl_mutex); return ret; } -- 2.31.0.rc2.261.g7f71774620-goog