From nobody Thu Apr 2 21:34:20 2026 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 8A13BC32771 for ; Wed, 21 Sep 2022 09:12:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230424AbiIUJMl (ORCPT ); Wed, 21 Sep 2022 05:12:41 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41052 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230118AbiIUJMg (ORCPT ); Wed, 21 Sep 2022 05:12:36 -0400 Received: from mail-ej1-x633.google.com (mail-ej1-x633.google.com [IPv6:2a00:1450:4864:20::633]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EC3118C46C for ; Wed, 21 Sep 2022 02:12:34 -0700 (PDT) Received: by mail-ej1-x633.google.com with SMTP id lh5so12085046ejb.10 for ; Wed, 21 Sep 2022 02:12:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:from:to:cc:subject:date; bh=7SbWdOzYyZ4DvXywVbhtnQssUKjn+mgaC4ezA3WwW3o=; b=YijMFEwnZJDizWX0f+eH3pCP+PWv7I8ClvZqfqQGbyTBg+SvtkVyjU+P/WvwbEE50S +NMSIRy+dcM8bTM+wYAEYkmvlr62VDaH4EORp+cAmhjRqroexl8TKoEEkfPCBirUHQQq 2nk1JtH8nEHYdjTzZelWVV5p/wOPvnz5WuvUQ= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-message-state:from:to:cc :subject:date; bh=7SbWdOzYyZ4DvXywVbhtnQssUKjn+mgaC4ezA3WwW3o=; b=7RiZ5ZT5ARPWuhnOxmqGF13y3/1wtTRAd4Tgqu4j+PZxHk+FDW8kD1QugQfbdc2tzS gzQWP3cxT7WdefzbbWPmlu/N151R4Di5MTl70BaPyXSJa7ylCSbMOc1ShR4njvVfBcRM UoGUK+Q7lC+hpN9PWOWN51iN5S2Q93W0gkERtI8sVxDg46K5tdP7SnfMql5gsjVfuvnm tJwWHUaUe6k6j+ys+T4bMJGGJhBCzSTeLPQMG++aQtqg1KZq1oeI3fuM9NEzaV3oNHB0 freXVkm8jRC7F4n/vLq7ngmF7cWHRKWBlJrQLw6vRwBsqztz+kOUpx+mPi6i9YBpUOvE /d7A== X-Gm-Message-State: ACrzQf0UDENkI8fIuKxvLWmCLzoShbVOhoLDQ3rXx/S5VKQLsJmiOPF6 h/7ouwWFnffQI/cuyY3/fFFhLA== X-Google-Smtp-Source: AMsMyM6wc3c0+orkPQiXhGroUrR/GRGODLFbNoe8tE5I0NOINNXOXlik+5dSr3v4pts5Z1EB9057ZQ== X-Received: by 2002:a17:906:fd82:b0:770:7e61:3707 with SMTP id xa2-20020a170906fd8200b007707e613707mr19611883ejb.143.1663751553499; Wed, 21 Sep 2022 02:12:33 -0700 (PDT) Received: from alco.roam.corp.google.com ([2620:0:1059:10:160b:cee7:2e8b:f72c]) by smtp.gmail.com with ESMTPSA id v4-20020a17090690c400b00771cb506149sm1031913ejw.59.2022.09.21.02.12.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Sep 2022 02:12:33 -0700 (PDT) From: Ricardo Ribalda Date: Wed, 21 Sep 2022 11:12:10 +0200 Subject: [PATCH v2 1/7] media: uvcvideo: uvc_ctrl_is_accessible: check for INACTIVE MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Message-Id: <20220920-resend-v4l2-compliance-v2-1-7c0942040004@chromium.org> References: <20220920-resend-v4l2-compliance-v2-0-7c0942040004@chromium.org> In-Reply-To: <20220920-resend-v4l2-compliance-v2-0-7c0942040004@chromium.org> To: Mauro Carvalho Chehab Cc: Laurent Pinchart , linux-media@vger.kernel.org, Hans Verkuil , Ricardo Ribalda , linux-kernel@vger.kernel.org X-Mailer: b4 0.11.0-dev-d93f8 X-Developer-Signature: v=1; a=openpgp-sha256; l=5006; i=ribalda@chromium.org; h=from:subject:message-id; bh=xRue/wJ3pUDw9TYU7ZEzphzigf/XRMvyyhrkUV+XLC0=; b=owEBbQKS/ZANAwAKAdE30T7POsSIAcsmYgBjKtV1Mb5wbPhj9MC58ku5ntzQRAlRcyVv7zWahjM8 r72EY9OJAjMEAAEKAB0WIQREDzjr+/4oCDLSsx7RN9E+zzrEiAUCYyrVdQAKCRDRN9E+zzrEiEfAD/ 48ZhGIcYGmGxqiQ9n40ihVBvUK3jJ5KfCOYT746WdTq+vT7eQg0JAwOlmXpgIDYIvA2mZ+jIKKqh4s S9ERooFZUEtDxxTiNZIwFbPfJ6AcYWK/qzkK3qmo/j2u7WPN2m3XAal0Ne/h1ENt9KbZxJkdHYHJfE s0Zt1F5zv3W562TVf3gfjqwtZ0icqgUCFcFlkFo6qKssvpxxiXw0/GPwWcc4oIY5Ztu8z4KYU8SNaF o0fy5HTn3hzw89cygG/v9/Jo+pckc1PZ+UTQrmtL9DM6sfsR7yQ857Ojbx37W19BGJv9jG/KN3/Pa5 hJRFaIicwCRKIMmOqYLxPcO8/37lazhxmNpmXAFHzl6nwCQNiueLFnFwfAEZara8dkBICWbZnFrkXg ke8rsUfY1mupBQgrzGs5vHashKNrBT9IM+wWrORTgdTFTj7Gk84efHFbsZylQPPzWU3GVVM1s7p9np cX3xpAiQ89KXf8nyR5j/fx2FFCFK9o5r+PRhbpmWetUKvrF8/Lvq2b44jc93W/ye5Enw9vCaSDv7MS AFxdNN9dfdrH6aRey1HaFyPj1hgGHl9HXnS9edAA97785Ym9KHDeoCrnFsMT1jUChF0zf/FtVF1/5f IfFk8gaeJdxv4p3xwT5tX2U5kRoBG5A1oqn2tpTG3z6jJW1HFA8Vgd464pYQ== X-Developer-Key: i=ribalda@chromium.org; a=openpgp; fpr=9EC3BB66E2FC129A6F90B39556A0D81F9F782DA9 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Hans Verkuil Check for inactive controls in uvc_ctrl_is_accessible(). Use the new value for the master_id controls if present, otherwise use the existing value to determine if it is OK to set the control. Doing this here avoids attempting to set an inactive control, which will return an error from the USB device, which returns an invalid errorcode. This fixes: warn: v4l2-test-controls.cpp(483): s_ctrl returned EIO =C2=A0 warn: v4l2-test-controls.cpp(483): s_ctrl returned EIO test VIDIOC_G/S_CTRL: OK =C2=A0 warn: v4l2-test-controls.cpp(739): s_ext_ctrls returned EIO =C2=A0 warn: v4l2-test-controls.cpp(739): s_ext_ctrls returned EIO =C2=A0 warn: v4l2-test-controls.cpp(816): s_ext_ctrls returned EIO test VIDIOC_G/S/TRY_EXT_CTRLS: OK Tested with: v4l2-ctl -c auto_exposure=3D1 OK v4l2-ctl -c exposure_time_absolute=3D251 OK v4l2-ctl -c auto_exposure=3D3 OK v4l2-ctl -c exposure_time_absolute=3D251 VIDIOC_S_EXT_CTRLS: failed: Input/output error exposure_time_absolute: Input/output error ERROR v4l2-ctl -c auto_exposure=3D3,exposure_time_absolute=3D251,auto_exposure=3D1 v4l2-ctl -C auto_exposure,exposure_time_absolute =C2=A0 auto_exposure: 1 exposure_time_absolute: 251 Reviewed-by: Ricardo Ribalda Signed-off-by: Hans Verkuil diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_c= trl.c index 8c208db9600b..7153ee5aabb1 100644 --- a/drivers/media/usb/uvc/uvc_ctrl.c +++ b/drivers/media/usb/uvc/uvc_ctrl.c @@ -1064,11 +1064,33 @@ static int uvc_query_v4l2_class(struct uvc_video_ch= ain *chain, u32 req_id, return 0; } =20 +/** + * uvc_ctrl_is_accessible() - Check if a control can be read/writen/tried. + * @chain: uvc_video_chain that the controls belong to. + * @v4l2_id: video4linux id of the control. + * @ctrl: Other controls that will be accessed in the ioctl. + * @ioctl: ioctl used to access the control. + * + * Check if a control can be accessed by a specicific ioctl operation, + * assuming that other controls are also going to be accessed by that ioct= l. + * We need to check the value of the other controls, to support operations + * where a master value is changed with a slave value. Eg. + * auto_exposure=3D1,exposure_time_absolute=3D251 + * + */ int uvc_ctrl_is_accessible(struct uvc_video_chain *chain, u32 v4l2_id, - bool read) + const struct v4l2_ext_controls *ctrls, + unsigned long ioctl) { + struct uvc_control_mapping *master_map =3D NULL; + struct uvc_control *master_ctrl =3D NULL; struct uvc_control_mapping *mapping; struct uvc_control *ctrl; + bool read =3D ioctl =3D=3D VIDIOC_G_EXT_CTRLS; + bool try =3D ioctl =3D=3D VIDIOC_TRY_EXT_CTRLS; + s32 val; + int ret; + int i; =20 if (__uvc_query_v4l2_class(chain, v4l2_id, 0) >=3D 0) return -EACCES; @@ -1083,6 +1105,29 @@ int uvc_ctrl_is_accessible(struct uvc_video_chain *c= hain, u32 v4l2_id, if (!(ctrl->info.flags & UVC_CTRL_FLAG_SET_CUR) && !read) return -EACCES; =20 + if (read || try || !mapping->master_id) + return 0; + + /* + * Iterate backwards in cases where the master control is accessed + * multiple times in the same ioctl. We want the last value. + */ + for (i =3D ctrls->count - 1; i >=3D 0; i--) { + if (ctrls->controls[i].id =3D=3D mapping->master_id) + return ctrls->controls[i].value =3D=3D + mapping->master_manual ? 0 : -EACCES; + } + + __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 0; + + ret =3D __uvc_ctrl_get(chain, master_ctrl, master_map, &val); + if (ret >=3D 0 && val !=3D mapping->master_manual) + return -EACCES; + return 0; } =20 diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v= 4l2.c index 4cc3fa6b8c98..d95168cdc2d1 100644 --- a/drivers/media/usb/uvc/uvc_v4l2.c +++ b/drivers/media/usb/uvc/uvc_v4l2.c @@ -1020,8 +1020,8 @@ static int uvc_ctrl_check_access(struct uvc_video_cha= in *chain, int ret =3D 0; =20 for (i =3D 0; i < ctrls->count; ++ctrl, ++i) { - ret =3D uvc_ctrl_is_accessible(chain, ctrl->id, - ioctl =3D=3D VIDIOC_G_EXT_CTRLS); + ret =3D uvc_ctrl_is_accessible(chain, ctrl->id, ctrls, + ioctl); if (ret) break; } diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvi= deo.h index 24c911aeebce..644d5fcf2eef 100644 --- a/drivers/media/usb/uvc/uvcvideo.h +++ b/drivers/media/usb/uvc/uvcvideo.h @@ -905,7 +905,8 @@ static inline int uvc_ctrl_rollback(struct uvc_fh *hand= le) int uvc_ctrl_get(struct uvc_video_chain *chain, struct v4l2_ext_control *x= ctrl); int uvc_ctrl_set(struct uvc_fh *handle, struct v4l2_ext_control *xctrl); int uvc_ctrl_is_accessible(struct uvc_video_chain *chain, u32 v4l2_id, - bool read); + const struct v4l2_ext_controls *ctrls, + unsigned long ioctl); =20 int uvc_xu_ctrl_query(struct uvc_video_chain *chain, struct uvc_xu_control_query *xqry); --=20 b4 0.11.0-dev-d93f8