From patchwork Thu May 21 17:02:45 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manivannan Sadhasivam X-Patchwork-Id: 189039 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 21984C433DF for ; Thu, 21 May 2020 17:03:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 010F420829 for ; Thu, 21 May 2020 17:03:47 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="yE2F3eqU" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730228AbgEURDq (ORCPT ); Thu, 21 May 2020 13:03:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50914 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729988AbgEURDp (ORCPT ); Thu, 21 May 2020 13:03:45 -0400 Received: from mail-pf1-x442.google.com (mail-pf1-x442.google.com [IPv6:2607:f8b0:4864:20::442]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C4D72C061A0E for ; Thu, 21 May 2020 10:03:45 -0700 (PDT) Received: by mail-pf1-x442.google.com with SMTP id n18so3607707pfa.2 for ; Thu, 21 May 2020 10:03:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=HJdUtFskJTJX9hH5IqG0JWO7Sknuz1pUAhyTdOQmOSs=; b=yE2F3eqU2dXuCxAO8X3zL1DuhcawU48juSAfsfYH1wgB9zqgXwzU0anzBUe2gwqCvN MSy8eCEy39vC1RhBLUgVHsoVNtOOdcIheysyZoYLHoSBMRw84pLm3dIAOd1WA7RJ0ZCS wCcM3Tdy1+4FfxQ+oBt1KFcFOKP0A2zYlB8mQbHv+nuesOHE2KOQCDYYb9WC7wTfxpwd TN9mP024MK5zP/ceU2ks8YKgpb5QRMULKfN4gJ9cixRX3SxonNz6kkebytlQwfgYVluz EjY8EAU64IpJRmuUxeQzeDU3yX9zrNISHCkaCv+4frMMnxzkv9P0m1kaxFFu6gnyDnMN GPcA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=HJdUtFskJTJX9hH5IqG0JWO7Sknuz1pUAhyTdOQmOSs=; b=Hfk3lxpihgH/W+GkZxmBb41UYUJHYXGNcyl8mRpWzCo+Yh3tj3XBfayTNsSuT9va1w TlAHxu7kHNb7rCSXFWE2SPxgvhphu4eswE7hOxe2MFtes8AA++Xv7nLV2m5inu0VUE8F nkXf8MsWd07NH9RwNX+5ohLQtT+TuXa6hzl4//CaN2NuiHNzvwO81FF+u4nBy0WOWWFe N6rtmha5E+D84s2tpL+F50UZAdlhMkU5mnj0/Y1pt4kC65JO+hcZgRm1fnhAcVEiQW55 17o9vJULsSr3DGTvMVqUMx2b33Y7HA2jH3wOLnseW2Q4n9IDc4TZ/JyJbZ3NQkNlU9gO I93g== X-Gm-Message-State: AOAM531KFA60dTusCoGcRAyVY2AA5YZIC9KuRMq3GhDOkAIIZPXVTDIU ptE0arKzZRSlxvePbLvlA3/W X-Google-Smtp-Source: ABdhPJxsrfOklYSPQDiDPdFTwuCEkiUARZXOFTMu1gxUQM0Oee13qxGfDle3g0oTQPnCyenyjvQ9vQ== X-Received: by 2002:a62:b503:: with SMTP id y3mr6816452pfe.3.1590080625223; Thu, 21 May 2020 10:03:45 -0700 (PDT) Received: from localhost.localdomain ([2409:4072:69f:45f2:3d8d:3719:f568:7ee9]) by smtp.gmail.com with ESMTPSA id e26sm4874693pff.137.2020.05.21.10.03.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 21 May 2020 10:03:44 -0700 (PDT) From: Manivannan Sadhasivam To: gregkh@linuxfoundation.org Cc: hemantk@codeaurora.org, jhugo@codeaurora.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, Manivannan Sadhasivam Subject: [RESEND PATCH 10/14] bus: mhi: core: Handle disable transitions in state worker Date: Thu, 21 May 2020 22:32:45 +0530 Message-Id: <20200521170249.21795-11-manivannan.sadhasivam@linaro.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200521170249.21795-1-manivannan.sadhasivam@linaro.org> References: <20200521170249.21795-1-manivannan.sadhasivam@linaro.org> Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org From: Hemant Kumar Mission mode transition is handled by state worker thread but power off is not. There is a possibility while mission mode transition is in progress which calls MHI client driver probe, power off is issued by MHI controller. This results into client driver probe and remove running in parallel and causes use after free situation. By queuing disable transition work when mission mode is in progress prevents the race condition. Signed-off-by: Hemant Kumar Reviewed-by: Jeffrey Hugo Reviewed-by: Manivannan Sadhasivam Signed-off-by: Manivannan Sadhasivam --- drivers/bus/mhi/core/init.c | 1 + drivers/bus/mhi/core/internal.h | 1 + drivers/bus/mhi/core/pm.c | 11 ++++++++++- 3 files changed, 12 insertions(+), 1 deletion(-) diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c index 3a853c5d2103..12207cc438aa 100644 --- a/drivers/bus/mhi/core/init.c +++ b/drivers/bus/mhi/core/init.c @@ -35,6 +35,7 @@ const char * const dev_state_tran_str[DEV_ST_TRANSITION_MAX] = { [DEV_ST_TRANSITION_SBL] = "SBL", [DEV_ST_TRANSITION_MISSION_MODE] = "MISSION_MODE", [DEV_ST_TRANSITION_SYS_ERR] = "SYS_ERR", + [DEV_ST_TRANSITION_DISABLE] = "DISABLE", }; const char * const mhi_state_str[MHI_STATE_MAX] = { diff --git a/drivers/bus/mhi/core/internal.h b/drivers/bus/mhi/core/internal.h index f01283b8a451..b1f640b75a94 100644 --- a/drivers/bus/mhi/core/internal.h +++ b/drivers/bus/mhi/core/internal.h @@ -387,6 +387,7 @@ enum dev_st_transition { DEV_ST_TRANSITION_SBL, DEV_ST_TRANSITION_MISSION_MODE, DEV_ST_TRANSITION_SYS_ERR, + DEV_ST_TRANSITION_DISABLE, DEV_ST_TRANSITION_MAX, }; diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c index 743b3207c390..a5d9973059c8 100644 --- a/drivers/bus/mhi/core/pm.c +++ b/drivers/bus/mhi/core/pm.c @@ -657,6 +657,10 @@ void mhi_pm_st_worker(struct work_struct *work) mhi_pm_disable_transition (mhi_cntrl, MHI_PM_SYS_ERR_PROCESS); break; + case DEV_ST_TRANSITION_DISABLE: + mhi_pm_disable_transition + (mhi_cntrl, MHI_PM_SHUTDOWN_PROCESS); + break; default: break; } @@ -868,7 +872,12 @@ void mhi_power_down(struct mhi_controller *mhi_cntrl, bool graceful) to_mhi_pm_state_str(MHI_PM_LD_ERR_FATAL_DETECT), to_mhi_pm_state_str(mhi_cntrl->pm_state)); } - mhi_pm_disable_transition(mhi_cntrl, MHI_PM_SHUTDOWN_PROCESS); + + mhi_queue_state_transition(mhi_cntrl, DEV_ST_TRANSITION_DISABLE); + + /* Wait for shutdown to complete */ + flush_work(&mhi_cntrl->st_worker); + mhi_deinit_free_irq(mhi_cntrl); if (!mhi_cntrl->pre_init) {