From patchwork Tue Feb 16 21:38:16 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeffrey Hugo X-Patchwork-Id: 12090641 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=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,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 7CC8CC433DB for ; Tue, 16 Feb 2021 21:39:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 51FB964E42 for ; Tue, 16 Feb 2021 21:39:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229908AbhBPVj0 (ORCPT ); Tue, 16 Feb 2021 16:39:26 -0500 Received: from z11.mailgun.us ([104.130.96.11]:21780 "EHLO z11.mailgun.us" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229533AbhBPVjX (ORCPT ); Tue, 16 Feb 2021 16:39:23 -0500 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1613511539; h=Content-Transfer-Encoding: MIME-Version: Message-Id: Date: Subject: Cc: To: From: Sender; bh=394gxo912siOqaIpJl71yvRDB0TG0CrguHcjHcHjxjg=; b=uWhZMtn7p93KqDuiVSEhYFKxOHtFiHZY7hFPUFDmPqep/UMUnAOkQw/o8lSaRKVClpt42CRb yyIxYv+w207sO4cYx/FhAIG3heTWjBBAE1lNjyUy3f1KPh5ulHaz4QXRGGQdYlqyHgZw+Xpf qzrd/W1F09aqP+EbsnTkh/pLoYc= X-Mailgun-Sending-Ip: 104.130.96.11 X-Mailgun-Sid: WyI1MzIzYiIsICJsaW51eC1hcm0tbXNtQHZnZXIua2VybmVsLm9yZyIsICJiZTllNGEiXQ== Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by smtp-out-n07.prod.us-west-2.postgun.com with SMTP id 602c3b524129d8cb4a6f04ab (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Tue, 16 Feb 2021 21:38:26 GMT Sender: jhugo=codeaurora.org@mg.codeaurora.org Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 3B93BC43462; Tue, 16 Feb 2021 21:38:26 +0000 (UTC) Received: from jhugo-lnx.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: jhugo) by smtp.codeaurora.org (Postfix) with ESMTPSA id C4A4EC433CA; Tue, 16 Feb 2021 21:38:24 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org C4A4EC433CA Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=fail smtp.mailfrom=jhugo@codeaurora.org From: Jeffrey Hugo To: manivannan.sadhasivam@linaro.org, hemantk@codeaurora.org Cc: bbhatt@codeaurora.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, Jeffrey Hugo Subject: [PATCH] mhi_bus: core: Check state before processing power_down Date: Tue, 16 Feb 2021 14:38:16 -0700 Message-Id: <1613511496-22271-1-git-send-email-jhugo@codeaurora.org> X-Mailer: git-send-email 2.7.4 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org We cannot process a power_down if the power state is DISABLED. There is no valid mhi_ctxt in that case, so attepting to process the power_down will likely result in a null pointer dereference. If the power state is DISABLED, there is nothing to do anyways, so just bail early. Signed-off-by: Jeffrey Hugo --- drivers/bus/mhi/core/pm.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c index 56ba3ab..dc69074 100644 --- a/drivers/bus/mhi/core/pm.c +++ b/drivers/bus/mhi/core/pm.c @@ -1144,6 +1144,7 @@ int mhi_async_power_up(struct mhi_controller *mhi_cntrl) mhi_deinit_dev_ctxt(mhi_cntrl); error_dev_ctxt: + mhi_cntrl->pm_state = MHI_PM_DISABLE; mutex_unlock(&mhi_cntrl->pm_mutex); return ret; @@ -1155,6 +1156,12 @@ void mhi_power_down(struct mhi_controller *mhi_cntrl, bool graceful) enum mhi_pm_state cur_state, transition_state; struct device *dev = &mhi_cntrl->mhi_dev->dev; + mutex_lock(&mhi_cntrl->pm_mutex); + cur_state = mhi_cntrl->pm_state; + mutex_unlock(&mhi_cntrl->pm_mutex); + if (cur_state == MHI_PM_DISABLE) + return; /* Already powered down */ + /* If it's not a graceful shutdown, force MHI to linkdown state */ transition_state = (graceful) ? MHI_PM_SHUTDOWN_PROCESS : MHI_PM_LD_ERR_FATAL_DETECT;