From patchwork Thu Sep 10 12:44:15 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mansur Alisha Shaik X-Patchwork-Id: 11767779 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 60AC2698 for ; Thu, 10 Sep 2020 12:48:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4C3C120882 for ; Thu, 10 Sep 2020 12:48:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730832AbgIJMqY (ORCPT ); Thu, 10 Sep 2020 08:46:24 -0400 Received: from alexa-out.qualcomm.com ([129.46.98.28]:11026 "EHLO alexa-out.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730696AbgIJMpg (ORCPT ); Thu, 10 Sep 2020 08:45:36 -0400 Received: from ironmsg07-lv.qualcomm.com (HELO ironmsg07-lv.qulacomm.com) ([10.47.202.151]) by alexa-out.qualcomm.com with ESMTP; 10 Sep 2020 05:44:39 -0700 Received: from ironmsg02-blr.qualcomm.com ([10.86.208.131]) by ironmsg07-lv.qulacomm.com with ESMTP/TLS/AES256-SHA; 10 Sep 2020 05:44:37 -0700 Received: from c-mansur-linux.qualcomm.com ([10.204.90.208]) by ironmsg02-blr.qualcomm.com with ESMTP; 10 Sep 2020 18:14:25 +0530 Received: by c-mansur-linux.qualcomm.com (Postfix, from userid 461723) id DD94921D23; Thu, 10 Sep 2020 18:14:23 +0530 (IST) From: Mansur Alisha Shaik To: linux-media@vger.kernel.org, stanimir.varbanov@linaro.org Cc: linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, vgarodia@codeaurora.org, Mansur Alisha Shaik Subject: [PATCH v2 2/3] venus: core: cancel pending work items in workqueue Date: Thu, 10 Sep 2020 18:14:15 +0530 Message-Id: <1599741856-16239-3-git-send-email-mansur@codeaurora.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1599741856-16239-1-git-send-email-mansur@codeaurora.org> References: <1599741856-16239-1-git-send-email-mansur@codeaurora.org> Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org In concurrency usecase and reboot scenario we are observing race condition and seeing NULL pointer dereference crash. In shutdown path and system recovery path we are destroying the same mutex hence seeing crash. This case is handled by mutex protection and cancel delayed work items in work queue. Below is the call trace for the crash Call trace: venus_remove+0xdc/0xec [venus_core] venus_core_shutdown+0x1c/0x34 [venus_core] platform_drv_shutdown+0x28/0x34 device_shutdown+0x154/0x1fc kernel_restart_prepare+0x40/0x4c kernel_restart+0x1c/0x64 Call trace: mutex_lock+0x34/0x60 venus_hfi_destroy+0x28/0x98 [venus_core] hfi_destroy+0x1c/0x28 [venus_core] venus_sys_error_handler+0x60/0x14c [venus_core] process_one_work+0x210/0x3d0 worker_thread+0x248/0x3f4 kthread+0x11c/0x12c ret_from_fork+0x10/0x18 Signed-off-by: Mansur Alisha Shaik --- drivers/media/platform/qcom/venus/core.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/media/platform/qcom/venus/core.c b/drivers/media/platform/qcom/venus/core.c index c5af428..69aa199 100644 --- a/drivers/media/platform/qcom/venus/core.c +++ b/drivers/media/platform/qcom/venus/core.c @@ -323,6 +323,8 @@ static int venus_remove(struct platform_device *pdev) struct device *dev = core->dev; int ret; + cancel_delayed_work_sync(&core->work); + ret = pm_runtime_get_sync(dev); WARN_ON(ret < 0); @@ -340,7 +342,9 @@ static int venus_remove(struct platform_device *pdev) if (pm_ops->core_put) pm_ops->core_put(dev); + mutex_lock(&core->lock); hfi_destroy(core); + mutex_unlock(&core->lock); icc_put(core->video_path); icc_put(core->cpucfg_path);