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{ "id": 17897, "url": "https://patchwork.libcamera.org/api/patches/17897/?format=api", "web_url": "https://patchwork.libcamera.org/patch/17897/", "project": { "id": 1, "url": "https://patchwork.libcamera.org/api/projects/1/?format=api", "name": "libcamera", "link_name": "libcamera", "list_id": "libcamera_core", "list_email": "libcamera-devel@lists.libcamera.org", "web_url": "", "scm_url": "", "webscm_url": "" }, "msgid": "<20221124144553.3012369-1-kieran.bingham@ideasonboard.com>", "date": "2022-11-24T14:45:53", "name": "[libcamera-devel,v5] libcamera: v4l2_device: Workaround faulty control menus", "commit_ref": "96ed45b9711e5c70afc4f91eab0ed657ccfb9695", "pull_url": null, "state": "accepted", "archived": false, "hash": "12c1a58dbbaf19021373ba119be7b1e736b3f92c", "submitter": { "id": 4, "url": "https://patchwork.libcamera.org/api/people/4/?format=api", "name": "Kieran Bingham", "email": "kieran.bingham@ideasonboard.com" }, "delegate": null, "mbox": "https://patchwork.libcamera.org/patch/17897/mbox/", "series": [ { "id": 3640, "url": "https://patchwork.libcamera.org/api/series/3640/?format=api", "web_url": "https://patchwork.libcamera.org/project/libcamera/list/?series=3640", "date": "2022-11-24T14:45:53", "name": "[libcamera-devel,v5] libcamera: v4l2_device: Workaround faulty control menus", "version": 5, "mbox": "https://patchwork.libcamera.org/series/3640/mbox/" } ], "comments": "https://patchwork.libcamera.org/api/patches/17897/comments/", "check": "pending", "checks": "https://patchwork.libcamera.org/api/patches/17897/checks/", "tags": {}, "headers": { "Return-Path": "<libcamera-devel-bounces@lists.libcamera.org>", "X-Original-To": "parsemail@patchwork.libcamera.org", "Delivered-To": "parsemail@patchwork.libcamera.org", "Received": [ "from lancelot.ideasonboard.com (lancelot.ideasonboard.com\n\t[92.243.16.209])\n\tby patchwork.libcamera.org (Postfix) with ESMTPS id 33711BDE6B\n\tfor <parsemail@patchwork.libcamera.org>;\n\tThu, 24 Nov 2022 14:45:59 +0000 (UTC)", "from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 7DAFE6331F;\n\tThu, 24 Nov 2022 15:45:58 +0100 (CET)", "from perceval.ideasonboard.com (perceval.ideasonboard.com\n\t[213.167.242.64])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 8C8CF6330D\n\tfor <libcamera-devel@lists.libcamera.org>;\n\tThu, 24 Nov 2022 15:45:57 +0100 (CET)", "from Monstersaurus.local\n\t(cpc89244-aztw30-2-0-cust3082.18-1.cable.virginm.net [86.31.172.11])\n\tby perceval.ideasonboard.com (Postfix) with ESMTPSA id DCC52496;\n\tThu, 24 Nov 2022 15:45:56 +0100 (CET)" ], "DKIM-Signature": [ "v=1; 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dkim=pass (1024-bit key; \n\tunprotected) header.d=ideasonboard.com\n\theader.i=@ideasonboard.com\n\theader.b=\"Oymq002i\"; dkim-atps=neutral", "To": "libcamera devel <libcamera-devel@lists.libcamera.org>", "Date": "Thu, 24 Nov 2022 14:45:53 +0000", "Message-Id": "<20221124144553.3012369-1-kieran.bingham@ideasonboard.com>", "X-Mailer": "git-send-email 2.34.1", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "Subject": "[libcamera-devel] [PATCH v5] libcamera: v4l2_device: Workaround\n\tfaulty control menus", "X-BeenThere": "libcamera-devel@lists.libcamera.org", "X-Mailman-Version": "2.1.29", "Precedence": "list", "List-Id": "<libcamera-devel.lists.libcamera.org>", "List-Unsubscribe": "<https://lists.libcamera.org/options/libcamera-devel>,\n\t<mailto:libcamera-devel-request@lists.libcamera.org?subject=unsubscribe>", "List-Archive": "<https://lists.libcamera.org/pipermail/libcamera-devel/>", "List-Post": "<mailto:libcamera-devel@lists.libcamera.org>", "List-Help": "<mailto:libcamera-devel-request@lists.libcamera.org?subject=help>", "List-Subscribe": "<https://lists.libcamera.org/listinfo/libcamera-devel>,\n\t<mailto:libcamera-devel-request@lists.libcamera.org?subject=subscribe>", "From": "Kieran Bingham via libcamera-devel\n\t<libcamera-devel@lists.libcamera.org>", "Reply-To": "Kieran Bingham <kieran.bingham@ideasonboard.com>", "Cc": "Marian Buschsieweke <marian.buschsieweke@ovgu.de>", "Errors-To": "libcamera-devel-bounces@lists.libcamera.org", "Sender": "\"libcamera-devel\" <libcamera-devel-bounces@lists.libcamera.org>" }, "content": "Some UVC cameras have been identified that can provide V4L2 menu\ncontrols without any menu items.\n\nThis leads to a segfault where we try to construct a\nControlInfo(Span<>,default) with an empty span.\n\nConvert the v4l2ControlInfo and v4l2MenuControlInfo helper functions to\nreturn std::optional<ControlInfo> to be able to account in the caller if\nthe control is valid, and only add acceptable controls to the supported\ncontrol list.\n\nMenu controls without a list of menu items are no longer added as a\nvalid control and a warning is logged.\n\nThis also fixes a potential crash that would have occured in the\nunlikely event that a ctrl.minimum was set to less than 0.\n\nBug: https://bugs.libcamera.org/show_bug.cgi?id=167\nReported-by: Marian Buschsieweke <marian.buschsieweke@ovgu.de>\nReviewed-by: Jacopo Mondi <jacopo@jmondi.org>\nSigned-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>\n---\n\nAs I posted two v3 patches, I've gone straight to v5 on this.\n\nNow there's only the common path error report, and a couple of minor\ntext fixes.\n\n\n include/libcamera/internal/v4l2_device.h | 4 ++--\n src/libcamera/v4l2_device.cpp | 28 +++++++++++++++++++-----\n 2 files changed, 25 insertions(+), 7 deletions(-)", "diff": "diff --git a/include/libcamera/internal/v4l2_device.h b/include/libcamera/internal/v4l2_device.h\nindex 75304be11f77..50d4adbc5f2b 100644\n--- a/include/libcamera/internal/v4l2_device.h\n+++ b/include/libcamera/internal/v4l2_device.h\n@@ -70,8 +70,8 @@ protected:\n private:\n \tstatic ControlType v4l2CtrlType(uint32_t ctrlType);\n \tstatic std::unique_ptr<ControlId> v4l2ControlId(const v4l2_query_ext_ctrl &ctrl);\n-\tControlInfo v4l2ControlInfo(const v4l2_query_ext_ctrl &ctrl);\n-\tControlInfo v4l2MenuControlInfo(const v4l2_query_ext_ctrl &ctrl);\n+\tstd::optional<ControlInfo> v4l2ControlInfo(const v4l2_query_ext_ctrl &ctrl);\n+\tstd::optional<ControlInfo> v4l2MenuControlInfo(const v4l2_query_ext_ctrl &ctrl);\n \n \tvoid listControls();\n \tvoid updateControls(ControlList *ctrls,\ndiff --git a/src/libcamera/v4l2_device.cpp b/src/libcamera/v4l2_device.cpp\nindex c17b323f8af0..57a88d96b12c 100644\n--- a/src/libcamera/v4l2_device.cpp\n+++ b/src/libcamera/v4l2_device.cpp\n@@ -529,7 +529,7 @@ std::unique_ptr<ControlId> V4L2Device::v4l2ControlId(const v4l2_query_ext_ctrl &\n * \\param[in] ctrl The v4l2_query_ext_ctrl that represents a V4L2 control\n * \\return A ControlInfo that represents \\a ctrl\n */\n-ControlInfo V4L2Device::v4l2ControlInfo(const v4l2_query_ext_ctrl &ctrl)\n+std::optional<ControlInfo> V4L2Device::v4l2ControlInfo(const v4l2_query_ext_ctrl &ctrl)\n {\n \tswitch (ctrl.type) {\n \tcase V4L2_CTRL_TYPE_U8:\n@@ -566,14 +566,14 @@ ControlInfo V4L2Device::v4l2ControlInfo(const v4l2_query_ext_ctrl &ctrl)\n *\n * \\return A ControlInfo that represents \\a ctrl\n */\n-ControlInfo V4L2Device::v4l2MenuControlInfo(const struct v4l2_query_ext_ctrl &ctrl)\n+std::optional<ControlInfo> V4L2Device::v4l2MenuControlInfo(const struct v4l2_query_ext_ctrl &ctrl)\n {\n \tstd::vector<ControlValue> indices;\n \tstruct v4l2_querymenu menu = {};\n \tmenu.id = ctrl.id;\n \n \tif (ctrl.minimum < 0)\n-\t\treturn ControlInfo();\n+\t\treturn std::nullopt;\n \n \tfor (int32_t index = ctrl.minimum; index <= ctrl.maximum; ++index) {\n \t\tmenu.index = index;\n@@ -583,6 +583,14 @@ ControlInfo V4L2Device::v4l2MenuControlInfo(const struct v4l2_query_ext_ctrl &ct\n \t\tindices.push_back(index);\n \t}\n \n+\t/*\n+\t * Some faulty UVC devices are known to return an empty menu control.\n+\t * Controls without a menu option can not be set, or read, so they are\n+\t * not exposed.\n+\t */\n+\tif (indices.size() == 0)\n+\t\treturn std::nullopt;\n+\n \treturn ControlInfo(indices,\n \t\t\t ControlValue(static_cast<int32_t>(ctrl.default_value)));\n }\n@@ -631,7 +639,17 @@ void V4L2Device::listControls()\n \t\tcontrolIdMap_[ctrl.id] = controlIds_.back().get();\n \t\tcontrolInfo_.emplace(ctrl.id, ctrl);\n \n-\t\tctrls.emplace(controlIds_.back().get(), v4l2ControlInfo(ctrl));\n+\t\tstd::optional<ControlInfo> info = v4l2ControlInfo(ctrl);\n+\n+\t\tif (!info) {\n+\t\t\tLOG(V4L2, Error)\n+\t\t\t\t<< \"Control \" << ctrl.name\n+\t\t\t\t<< \" cannot be registered\";\n+\n+\t\t\tcontinue;\n+\t\t}\n+\n+\t\tctrls.emplace(controlIds_.back().get(), *info);\n \t}\n \n \tcontrols_ = ControlInfoMap(std::move(ctrls), controlIdMap_);\n@@ -670,7 +688,7 @@ void V4L2Device::updateControlInfo()\n \t\t\tcontinue;\n \t\t}\n \n-\t\tinfo = v4l2ControlInfo(ctrl);\n+\t\tinfo = *v4l2ControlInfo(ctrl);\n \t}\n }\n \n", "prefixes": [ "libcamera-devel", "v5" ] }