From patchwork Sun Jul 30 12:42:36 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hans Verkuil X-Patchwork-Id: 9870457 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 5E9FD6037D for ; Sun, 30 Jul 2017 12:43:16 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 54ABC28582 for ; Sun, 30 Jul 2017 12:43:16 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 474F42858F; Sun, 30 Jul 2017 12:43:16 +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=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 4431528582 for ; Sun, 30 Jul 2017 12:43:14 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 6AC126E394; Sun, 30 Jul 2017 12:42:44 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from lb3-smtp-cloud7.xs4all.net (lb3-smtp-cloud7.xs4all.net [194.109.24.31]) by gabe.freedesktop.org (Postfix) with ESMTPS id 669BA6E394 for ; Sun, 30 Jul 2017 12:42:43 +0000 (UTC) Received: from [192.168.2.10] ([212.251.195.8]) by smtp-cloud7.xs4all.net with ESMTPA id bnYKdCaMyfjgxbnYOd2UO6; Sun, 30 Jul 2017 14:42:41 +0200 To: Maling list - DRI developers , Rob Clark , linux-arm-msm@vger.kernel.org, Archit Taneja From: Hans Verkuil Subject: WARN_ON in drivers/gpu/drm/msm/msm_gem.c Message-ID: <52195708-75db-936a-ef43-a813f1d47598@xs4all.nl> Date: Sun, 30 Jul 2017 14:42:36 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.2.1 MIME-Version: 1.0 Content-Language: en-US X-CMAE-Envelope: MS4wfH77QahcwHTcB7xWb18MDE5QRFODE1GSYhhx5T/VJyyOH+eAZEsX7JxL4JkmtxI7uFnNpNoeFUekkcJ2ayVA6Eiv0pzrFKSLmcbNgtv59fEDYwPui/p9 8IdSwFGvKEMuZi20thpvbRofB79J722lP5Hmr1kC2VI781ooPp+RsKmlhXbZB3GwD0dxrBPb9t9CaI26josIhkEqjJRQcpK2Rc/5jq3w/fTXe8njkaeHi94e nwvkkT1CUGHclj1ZAxkLVzXUoRlUfE6t7T8BCgM53j3Bd7YkpN+CHt6Ft+EgbCUTDxCpA0/+2xEFEHz7swbjoUlTEONwY0uN2+zoTvllcxg= X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" X-Virus-Scanned: ClamAV using ClamSMTP Hi all, While I was testing the upcoming adv7533 CEC support with my Dragonboard c410 I encountered this warning several times during boot: [ 4.408309] WARNING: CPU: 3 PID: 1347 at drivers/gpu/drm/msm/msm_gem.c:312 add_vma+0x78/0x88 [msm] [ 4.412951] Modules linked in: snd_soc_hdmi_codec adv7511 cec qcom_wcnss_pil msm mdt_loader drm_kms_helper msm_rng rng_core drm [ 4.421728] CPU: 3 PID: 1347 Comm: kworker/3:3 Not tainted 4.13.0-rc1-dragonboard #111 [ 4.433090] Hardware name: Qualcomm Technologies, Inc. APQ 8016 SBC (DT) [ 4.441081] Workqueue: events deferred_probe_work_func [ 4.447929] task: ffff800031243600 task.stack: ffff800003394000 [ 4.453023] PC is at add_vma+0x78/0x88 [msm] [ 4.458823] LR is at _msm_gem_new+0xd4/0x188 [msm] [ 4.463207] pc : [] lr : [] pstate: 40000145 [ 4.467811] sp : ffff8000033978a0 [ 4.475357] x29: ffff8000033978a0 x28: ffff8000031dea18 [ 4.478572] x27: ffff800003933a00 x26: ffff800003b39800 [ 4.483953] x25: ffff8000338ff800 x24: 0000000000000001 [ 4.489249] x23: 0000000000000000 x22: ffff800003b39800 [ 4.494544] x21: ffff8000338ff800 x20: 0000000000000000 [ 4.499839] x19: ffff800003932600 x18: 0000000000000001 [ 4.505135] x17: 0000ffff8969e9e0 x16: ffff7e00000ce7a0 [ 4.510429] x15: ffffffffffffffff x14: ffff8000833977ef [ 4.515724] x13: ffff8000033977f3 x12: 0000000000000038 [ 4.521020] x11: 0101010101010101 x10: ffffff7f7fff7f7f [ 4.526315] x9 : 0000000000000000 x8 : ffff800003932800 [ 4.531633] x7 : 0000000000000000 x6 : 000000000000003f [ 4.531644] x5 : 0000000000000040 x4 : 0000000000000000 [ 4.531650] x3 : ffff800031243600 x2 : 0000000000000000 [ 4.531655] x1 : 0000000000000000 x0 : 0000000000000000 [ 4.531670] Call trace: [ 4.531676] Exception stack(0xffff8000033976c0 to 0xffff8000033977f0) [ 4.531683] 76c0: ffff800003932600 0001000000000000 ffff8000033978a0 ffff000000ac01f8 [ 4.531688] 76e0: 0000000000000140 0000000000000000 ffff800003932550 ffff800003397780 [ 4.531694] 7700: ffff800003397730 ffff000008261ce8 0000000000000000 ffff8000031d2f80 [ 4.531699] 7720: ffff800003397800 ffff0000081d671c 0000000000000140 0000000000000000 [ 4.531705] 7740: ffff000000ac04c0 0000000000004003 ffff800003397908 00000000014080c0 [ 4.531710] 7760: 0000000000000000 ffff800003b39800 0000000000000000 0000000000000000 [ 4.531716] 7780: 0000000000000000 ffff800031243600 0000000000000000 0000000000000040 [ 4.531721] 77a0: 000000000000003f 0000000000000000 ffff800003932800 0000000000000000 [ 4.531726] 77c0: ffffff7f7fff7f7f 0101010101010101 0000000000000038 ffff8000033977f3 [ 4.531730] 77e0: ffff8000833977ef ffffffffffffffff [ 4.531881] [] add_vma+0x78/0x88 [msm] [ 4.532011] [] _msm_gem_new+0xd4/0x188 [msm] [ 4.532134] [] msm_gem_new+0x10/0x18 [msm] [ 4.532260] [] msm_dsi_host_modeset_init+0x17c/0x268 [msm] [ 4.532384] [] msm_dsi_modeset_init+0x34/0x1b8 [msm] [ 4.532504] [] modeset_init+0x408/0x488 [msm] [ 4.532623] [] mdp5_kms_init+0x2b4/0x338 [msm] [ 4.532745] [] msm_drm_bind+0x218/0x4e8 [msm] [ 4.532755] [] try_to_bring_up_master+0x1f4/0x318 [ 4.532762] [] component_add+0x98/0x180 [ 4.532887] [] dsi_dev_probe+0x18/0x28 [msm] [ 4.532895] [] platform_drv_probe+0x58/0xc0 [ 4.532901] [] driver_probe_device+0x324/0x458 [ 4.532907] [] __device_attach_driver+0xac/0x170 [ 4.532913] [] bus_for_each_drv+0x4c/0x98 [ 4.532918] [] __device_attach+0xc0/0x160 [ 4.532924] [] device_initial_probe+0x10/0x18 [ 4.532929] [] bus_probe_device+0x94/0xa0 [ 4.532934] [] deferred_probe_work_func+0x8c/0xe8 [ 4.532941] [] process_one_work+0x1d4/0x330 [ 4.532946] [] worker_thread+0x48/0x468 [ 4.532952] [] kthread+0x12c/0x130 [ 4.532958] [] ret_from_fork+0x10/0x40 [ 4.532962] ---[ end trace b1ac6888ec40b0bb ]--- After making this hack: it no longer complains. I have no idea how long the lock should be held here, but on the off-chance that I am actually right: Signed-off-by: Hans Verkuil Regards, Hans diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c index 65f35544c1ec..29459be6a4b0 100644 --- a/drivers/gpu/drm/msm/msm_gem.c +++ b/drivers/gpu/drm/msm/msm_gem.c @@ -928,8 +928,12 @@ static struct drm_gem_object *_msm_gem_new(struct drm_device *dev, if (use_vram) { struct msm_gem_vma *vma; struct page **pages; + struct msm_gem_object *msm_obj = to_msm_bo(obj); + + mutex_lock(&msm_obj->lock); vma = add_vma(obj, NULL); + mutex_unlock(&msm_obj->lock); if (IS_ERR(vma)) { ret = PTR_ERR(vma); goto fail;