From patchwork Fri May 4 13:52:12 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peter Rosin X-Patchwork-Id: 10380585 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 3395860353 for ; Fri, 4 May 2018 13:59:23 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 1325B2946B for ; Fri, 4 May 2018 13:59:23 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 04FF12946E; Fri, 4 May 2018 13:59:23 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.9 required=2.0 tests=BAD_ENC_HEADER,BAYES_00, DKIM_SIGNED, DKIM_VALID, MAILING_LIST_MULTI autolearn=unavailable version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 85F0C2946B for ; Fri, 4 May 2018 13:59:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=Xj4zidPZWpcX3rOHiWBdSy0RucwhU1PEXOzQhbD4/XQ=; b=Own6ggi+bTJCjR v2aGDhKkYBE6HNk3uw51VGnpkkacgoLGfuiQoGkrGTvCAaUdKdRd8HI7/CXCzaSuVRTPGAN9S7rz5 of4ChPObi+ivXpWN5exwybg2DL1A4aXUGMQ7N7dmLg/bzmwy+egYrAR5/TFWQ9TFw0s9XVK+tMRy3 zSK8U6w4ui0v/+4Ks8By4xYRtirGGRocIPqd24pwCsBFFzaI9ioNCPEYaaJEBjuYzMKrcxiVo920F kN5vf9OXevQZ2e/AQRd3pWXG8Ynktt41QvM/us0ESDwYRM/r7I3QiHgsrh22eXPMdeANMakXfP679 l1R3K2k4Lw2P+RF4WUjQ==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1fEbF0-0002vc-Kt; Fri, 04 May 2018 13:59:18 +0000 Received: from mail-eopbgr20112.outbound.protection.outlook.com ([40.107.2.112] helo=EUR02-VE1-obe.outbound.protection.outlook.com) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1fEbAo-0007iD-3B; Fri, 04 May 2018 13:55:35 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=axentia.se; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version; bh=o4CgJ4Ig3+G3wrQeS1SA7inEA8MHS2ayliGeZyETzc4=; b=eOK6fbiV3APxzeZhEm0/iTEP/U2x4YsLitnbnVX4Ft3cp0M+MxKsaOD0OmfYFFyN2H/UBYi3X47v6NBmlGEwRl76rPeLykzwFTW/ZNpg0QG9zZryAyhwYYytNGiTAQZ2HPJa3Ad2ByxnIOgsnBjH0q06Cc+PAfFGblBWhQIFVQs= Authentication-Results: spf=none (sender IP is ) smtp.mailfrom=peda@axentia.se; Received: from orc.pedanet (85.226.244.23) by AM4PR0202MB2769.eurprd02.prod.outlook.com (2603:10a6:200:8c::19) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.735.16; Fri, 4 May 2018 13:53:48 +0000 From: Peter Rosin To: linux-kernel@vger.kernel.org Subject: [PATCH v2 26/26] drm/bridge: establish a link between the bridge supplier and consumer Date: Fri, 4 May 2018 15:52:12 +0200 Message-Id: <20180504135212.26977-27-peda@axentia.se> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20180504135212.26977-1-peda@axentia.se> References: <20180504135212.26977-1-peda@axentia.se> MIME-Version: 1.0 X-Originating-IP: [85.226.244.23] X-ClientProxiedBy: DB6PR0202CA0039.eurprd02.prod.outlook.com (2603:10a6:4:a5::25) To AM4PR0202MB2769.eurprd02.prod.outlook.com (2603:10a6:200:8c::19) X-MS-PublicTrafficType: Email X-Microsoft-Antispam: UriScan:; BCL:0; PCL:0; RULEID:(7020095)(4652020)(7021125)(5600026)(4534165)(7022125)(4603075)(4627221)(201702281549075)(7048125)(7024125)(7027125)(7028125)(7023125)(2017052603328)(7153060)(7193020); SRVR:AM4PR0202MB2769; X-Microsoft-Exchange-Diagnostics: 1; AM4PR0202MB2769; 3:h/EL09aUjDZaZjsfyhhDyMJk/7+F39FKubOM2AtQ+PDGk52dll8gaNXW7/Y/1ywkP7AueTutTtWrUD9+Q3pHwT/ejm2JjMsZL/Ok+8EYSTOyz5ocghqmUbqjs7JGggo/38UxRvxka+I8zDuC8DDO9NdizG0np2czmYJbwU5aYX24dgIWfXqMiheR8Z3xnsRJkErvmbqVLxvjVCN0+QZ/7wnp5E78i5oUZqbhdMgmoB8HLyn0qjPsGW6u2pFAGVJm; 25:ieW76aSwOiutPc4IkO7JAXu6icgCwkfNlgWSnV0GRxAQOQ/OdI0X7VBnVLYle+UOyfDr7kY5gbGzveXWdlGakCdunhMeqKrZ6CmCz5nCekgN3ijAp8lstqMNPFYaKR0AgFLZF/BULXLvbpr+5utrzNn2010TfOCYQlCUbSINjsTNUc9sof0cNejd8GaP9uSwH03RvGM+gPbCp9Cs3AWpyt6onj6BMKHQZOr5a/8/3vwhDvmPKgZLHeiZMP1ZPuoXOQeJfMulWwG8xpUTu8ou6oG230eKfjInTYvOdeGGV6fmAWViZ/LxBhTkFkP5SGH5leZKzz/AoxdPwQKaBsIt+Q==; 31:ti6GUcWnxq+0NCLe7IEWOSttIw66tV5Ys0UgrWjR2wEVt2U7NObnHbt+ACzUQnqOmyeM1cW5+4eRNVfvzpqmSs9ZbCqWDe/KRHBiqFVcaqtyUIR9sAZQmkBbQFoesU1+1q05YUBMNyzmn1Y3nhyw7Nw/zOMaoR4l+uHc2iEqJhbgX/3MUfWxyqomrOQJRbPbFYNYDbSdyecyyTpIZwpm/EyJMfkcqlztEPQzq375KC4= X-MS-TrafficTypeDiagnostic: AM4PR0202MB2769: X-Microsoft-Antispam-PRVS: X-Exchange-Antispam-Report-Test: UriScan:; X-Exchange-Antispam-Report-CFA-Test: BCL:0; PCL:0; RULEID:(6040522)(2401047)(5005006)(8121501046)(3002001)(3231254)(944501410)(52105095)(10201501046)(93006095)(93001095)(6041310)(2016111802025)(20161123558120)(20161123562045)(20161123564045)(20161123560045)(6043046)(6072148)(201708071742011); SRVR:AM4PR0202MB2769; BCL:0; PCL:0; RULEID:; SRVR:AM4PR0202MB2769; X-Microsoft-Exchange-Diagnostics: 1; AM4PR0202MB2769; 4:7h21nB+eEtmQQQ6bXtL6V3+PpY4+UEiS2ja9oGx9+Fs8hw+lrpfNYrJ8cuLwRUGjuDmww8ndEnrmTO7cwOfV0sLXOOyp/3TvPCeP29oeiSFz6htJ+EkuNbJ3bHb3XEWrpCZ4rt8uTCqYYR24rmqC7e+CFB5/Wtb7noFFAmuznLMpR8Pz07TZs6547XoLpRLGJtrtfVVjLwhNJuXRhdarfcAkR+iyAMs6+Lt+Y0xyn/ta8zuiFs6Iw/zY60EunyMofGAsWUWhsGLg7bwEmQUyNg== X-Forefront-PRVS: 06628F7CA4 X-Forefront-Antispam-Report: SFV:NSPM; SFS:(10019020)(1496009)(366004)(39840400004)(39380400002)(376002)(346002)(396003)(199004)(189003)(52116002)(386003)(50466002)(305945005)(6506007)(54906003)(74482002)(316002)(68736007)(5660300001)(16586007)(6666003)(50226002)(7736002)(8936002)(81166006)(8676002)(97736004)(6916009)(1076002)(48376002)(2906002)(2351001)(2361001)(16526019)(81156014)(39060400002)(76176011)(4326008)(86362001)(6486002)(6116002)(3846002)(53936002)(5890100001)(106356001)(478600001)(11346002)(575784001)(486006)(446003)(36756003)(25786009)(51416003)(476003)(7406005)(956004)(105586002)(2616005)(7416002)(66066001)(6512007)(186003)(26005)(47776003)(42262002); DIR:OUT; SFP:1102; SCL:1; SRVR:AM4PR0202MB2769; H:orc.pedanet; FPR:; SPF:None; LANG:en; PTR:InfoNoRecords; A:1; MX:1; Received-SPF: None (protection.outlook.com: axentia.se does not designate permitted sender hosts) X-Microsoft-Exchange-Diagnostics: =?us-ascii?Q?1; AM4PR0202MB2769; 23:zNOFy6FVuiMFFpQNmhZ65YYhQ9jHfYRxEVWMA+s?= =?us-ascii?Q?sjtcLAMUJEJV0WLWnVQMh3ZRw3T0D3hPV87eUU/SG241LcmrVZQeWykESpXN?= =?us-ascii?Q?/8esDzq6jsYqoy67m3zAlyvii4BqJsq0xxcLiA40jdZugHhiku/ySoyEBm6X?= =?us-ascii?Q?TiQziP/t9x6OGG0BxGc4eME/69PIb+82ulZ6NwefqVdS4PHe/ok0C2ir7f+q?= =?us-ascii?Q?qXB5mh9lWO338Bmoi1mT1C2JZS0n6UBXvqN/qDuLHbj0BSR9GXw1ucddAkg4?= =?us-ascii?Q?OXBfXiUTtDooc0uj3GmGfLdVNMw6ZUGqePjD3evPc4uVAYRmbZTI/MLtqK6/?= =?us-ascii?Q?BDJ4ts4wNOR8EKK9tlumARd7apNze/D3wMWlubz4+0Cdi91l81ieW1tJX9df?= =?us-ascii?Q?HbwWN74SHKpRoS9RCTxblDi488LCb7hcz6o0mK0DuUIsrPMIH/6mZGVMDkkI?= =?us-ascii?Q?5KrnWvx1BdbHrYQ7/GYYdeCu/53C0Mlk9fbUpGUY1HZkA1EOmZgY8DUC2R1A?= =?us-ascii?Q?ZeggCjxCVRneWO8dPnb4MUCs9PTn6f4BFzuwilS5jqTSBfKSq36MqEFYWnu2?= =?us-ascii?Q?hWmX/3tuTOzLijuf6UULY4/MavsDBLWwK/WkxHA7JxEYlEiWlKPNQzYVdB9Y?= =?us-ascii?Q?VoBxOQB6QG0e98tHAkT8Xxc5zoc8X9WRIaiZfPLmGG4jf94DlyV+OGQOtskX?= =?us-ascii?Q?2/137N6DfFQUri+PTV/xpMsm9CIC+ETd55OnDEEvYBm+b6Z7xaLA+0kFUifz?= =?us-ascii?Q?iLrL5AJnKIuTEyUe3zgYQK47T7406h3hR/yL0f6sxIgJSOVrro07n1KsiNXX?= =?us-ascii?Q?dQiB0EseYFO/JnTG4Vr+B4+p3/xVXBxWXDYeflEdB7d9vZEYneLveAE/2Q/X?= =?us-ascii?Q?+1X1Gen+lnJj5DXSdx2JkXW0rM7gXVmHGA63vrvuzqqGToeZpfCRC2EpG/cw?= =?us-ascii?Q?J0/jHHwlf3gvIJqwHcJs1E1OtlePL/6vaiuF8L2G1fX1LhOiN6joauqZaGqm?= =?us-ascii?Q?49sm5urpUwqWFhiURtRr3YCL37eZGtLP/hQwpCANclp2vlMbYBMJVcbBHDQT?= =?us-ascii?Q?6aoO9t2P/4/P5JOUUsyZX2ciBHsZDoWJJ1FJadZD3G07GyAFi4pGHq3KD361?= =?us-ascii?Q?BpeSAaEOYXIgIpArzXaKtaNiCrhfof7jSnOiWNni2WccZTz42F2FNnVwElrT?= =?us-ascii?Q?mgnuihzUoJZS3tNRb0b0t350LeiM6yMPtq9OQ2ytN0BL8ukdjWPZDM9cadtG?= =?us-ascii?Q?vJFZiuWmQkvjUphkbYXrpcBsZQ9e/7owqvYI9JaU7kS/JqDw5l2ZMOfK1rxs?= =?us-ascii?Q?6vF+Bxv7bdD4iZp2wCFi3hTzXiERo77mZS4Cv4F3DnXc4wDo6aHX5l39Xsbc?= =?us-ascii?Q?/pjavvhcTezd56OFQ/yp3jjayQ/SwCvliE4FS6pV/OKUDxykzPEeCWZtxjrp?= =?us-ascii?Q?kvp3RbxYmzpCUbb8j42Hgg6m6LITgtd0=3D?= X-Microsoft-Antispam-Message-Info: gDeOIpxORQR+hHyJQJvJS/OIa3kKlg26W/Ji4jviX77vX8O6DLCTFvmSIPYo+gnpFTjGxuZHAm/b6nn2z/GKbJXCAxrg680zZGVHztSr864omUdqM+0hMa551KX/ZbC9YCsP7lB23NZtX1ms3wsY+Khd3uEvO0fCFIvqL6U76xaVZ0PKbbT9KaBj1mV6Obio X-Microsoft-Exchange-Diagnostics: 1; AM4PR0202MB2769; 6:8K15U9Vf/uZ0DKjT1vszcnh/Fq+qDWQK3ZJ7SjPeofJrLucNi4I7EUBhSQqlFTP+JE/cZpmF6YvXPnzvgYrjEay/hz/MN9shQZ7TSwv6iXEPrZYilIV257TaCDCAthASMGhrJvwM8gBVsvB/ewtTVvsn7kiQ/el+mQagUYpuv9Xmw0qTyt+1OSCz7191PDdfNs2k3ydEvOrpJsDTek4OzffgvdqxPPDP+9hvavN7bONXL3aFMsoi63zD0BkuhGMPJ9u82N6XaQgka2nTKljrk0+WkXt5s1nUbbDoPjsXD5mft4DiUdiEDbXj8Jhcz6CwnTQ5isjzNgI233GKAsa7qr/VYRYBjmVg07NaIVpq4IQ4qPNhvNM3WcKH+KwAde2KJjYJwC7ohLtBC2ETOIT/uX6RrnrF5Y86XzzDSJfZNmCrRhsXWIv4pb5I2gdnSH8F7MakHGC6VNjH8YqUTyxP2w==; 5:dmhyXVAnDG1Jh62aOxuCIaG0PidsZmXiG8ScAwAOqA6Zje2RgxXHAdIUMMrDgFIhykeMdpfvvBlAO5lN9ctKIq9apFXfFG79CIIdpvTIkilCPttTlqYIyMfXLFl7l/DpQc97Gxv4OlZo6qMXyAPLJt14Vqk2jIhEvKQO4gTd/dQ=; 24:W/y1XqAqjVDN7S9BPc5dPmIq59nPmkLaD+reUjO0tj/7f7NtnsxIKJLBlqIdRa/PhqogJbPigBC6O6vspsmGWRPUzK2c286akDM+Sp2PCWQ= SpamDiagnosticOutput: 1:99 SpamDiagnosticMetadata: NSPM X-Microsoft-Exchange-Diagnostics: 1; AM4PR0202MB2769; 7:kDHV7W8yzNovhypVmgwBwj/i8cg6MUCB1BvzBXXfTANNW0QOr5RPjXaZo7jb70Tdq3kDDwWODcOscGYkLUsWwAqYcO++9sMeuJ7a8wFTSaHrGjN89dtLHvG1q/YIMeZqHcR8x8F1IHehuWzk53ELTMu6ovx/cLJYDx4aXUvV+unNUIaLYGQnsGfUtZto4SLDkolkFC66lLYnUiqoKxeqpFmOD1cNTukdUimILbNtOttcnYf1HmaQLnkX4CPcjCQt X-MS-Office365-Filtering-Correlation-Id: 733b0d75-553f-4e6f-6500-08d5b1c67787 X-OriginatorOrg: axentia.se X-MS-Exchange-CrossTenant-OriginalArrivalTime: 04 May 2018 13:53:48.7057 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 733b0d75-553f-4e6f-6500-08d5b1c67787 X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 4ee68585-03e1-4785-942a-df9c1871a234 X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM4PR0202MB2769 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20180504_065458_382430_4C973EE1 X-CRM114-Status: GOOD ( 14.41 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Martyn Welch , David Airlie , Gustavo Padovan , dri-devel@lists.freedesktop.org, Andrzej Hajda , Laurent Pinchart , Benjamin Gaignard , =?UTF-8?q?Heiko=20St=C3=BCbner?= , Archit Taneja , linux-samsung-soc@vger.kernel.org, Joonyoung Shim , Kyungmin Park , Krzysztof Kozlowski , linux-rockchip@lists.infradead.org, Kukjin Kim , Peter Senna Tschudin , CK Hu , Martin Donnelly , Daniel Vetter , linux-arm-msm@vger.kernel.org, Maarten Lankhorst , Jyri Sarha , Inki Dae , Sean Paul , Matthias Brugger , Vincent Abriou , linux-arm-kernel@lists.infradead.org, Seung-Woo Kim , Sandy Huang , linux-renesas-soc@vger.kernel.org, Rob Clark , Philipp Zabel , linux-mediatek@lists.infradead.org, freedreno@lists.freedesktop.org, Peter Rosin Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+patchwork-linux-mediatek=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP If the bridge supplier is unbound, this will bring the bridge consumer down along with the bridge. Thus, there will no longer linger any dangling pointers from the bridge consumer (the drm_device) to some non-existent bridge supplier. Signed-off-by: Peter Rosin Reviewed-by: Andrzej Hajda Acked-by: Daniel Vetter --- drivers/gpu/drm/drm_bridge.c | 18 ++++++++++++++++++ include/drm/drm_bridge.h | 2 ++ 2 files changed, 20 insertions(+) diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c index 78d186b6831b..0259f0a3ff27 100644 --- a/drivers/gpu/drm/drm_bridge.c +++ b/drivers/gpu/drm/drm_bridge.c @@ -26,6 +26,7 @@ #include #include +#include #include #include "drm_crtc_internal.h" @@ -127,12 +128,25 @@ int drm_bridge_attach(struct drm_encoder *encoder, struct drm_bridge *bridge, if (bridge->dev) return -EBUSY; + if (encoder->dev->dev != bridge->odev) { + bridge->link = device_link_add(encoder->dev->dev, + bridge->odev, 0); + if (!bridge->link) { + dev_err(bridge->odev, "failed to link bridge to %s\n", + dev_name(encoder->dev->dev)); + return -EINVAL; + } + } + bridge->dev = encoder->dev; bridge->encoder = encoder; if (bridge->funcs->attach) { ret = bridge->funcs->attach(bridge); if (ret < 0) { + if (bridge->link) + device_link_del(bridge->link); + bridge->link = NULL; bridge->dev = NULL; bridge->encoder = NULL; return ret; @@ -159,6 +173,10 @@ void drm_bridge_detach(struct drm_bridge *bridge) if (bridge->funcs->detach) bridge->funcs->detach(bridge); + if (bridge->link) + device_link_del(bridge->link); + bridge->link = NULL; + bridge->dev = NULL; } diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h index b656e505d11e..804189c63a4c 100644 --- a/include/drm/drm_bridge.h +++ b/include/drm/drm_bridge.h @@ -261,6 +261,7 @@ struct drm_bridge_timings { * @list: to keep track of all added bridges * @timings: the timing specification for the bridge, if any (may * be NULL) + * @link: drm consumer <-> bridge supplier * @funcs: control functions * @driver_private: pointer to the bridge driver's internal context */ @@ -271,6 +272,7 @@ struct drm_bridge { struct drm_bridge *next; struct list_head list; const struct drm_bridge_timings *timings; + struct device_link *link; const struct drm_bridge_funcs *funcs; void *driver_private;