From patchwork Sun Aug 9 12:15:48 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Can Guo X-Patchwork-Id: 11706665 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 E576A14F6 for ; Sun, 9 Aug 2020 12:16:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CC4D4206E9 for ; Sun, 9 Aug 2020 12:16:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726322AbgHIMQ2 (ORCPT ); Sun, 9 Aug 2020 08:16:28 -0400 Received: from labrats.qualcomm.com ([199.106.110.90]:11462 "EHLO labrats.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726120AbgHIMQS (ORCPT ); Sun, 9 Aug 2020 08:16:18 -0400 IronPort-SDR: CTO+rrLecow/2EGmT11P2EhNW5sCylJEbG2R7mqzG9VnT1USWkD1s1DAdASKPb5UUx80GL+rNP e1SOnmKN+NBwmY/oz5IZoanGIpJ3tYyVl1FuWcYX/4znjmJGgli69lKaAI+yQ27KA+Q0MeW7F0 JwaRnGVRzT9la0942Q/9kcUbqNgvxqmfckXh/CJs2ahnaJBkYwZ2bnVCTqyqTIlYKTyXYXfQtb MCXRFMSNgiEE6V6igiDgynSqXUSP2Rww2i8ogSaWsBb/Z+CIiXNb9bmKgoWQFGn+pGbWoTnY8N vpc= X-IronPort-AV: E=Sophos;i="5.75,453,1589266800"; d="scan'208";a="47246498" Received: from unknown (HELO ironmsg01-sd.qualcomm.com) ([10.53.140.141]) by labrats.qualcomm.com with ESMTP; 09 Aug 2020 05:16:05 -0700 Received: from stor-presley.qualcomm.com ([192.168.140.85]) by ironmsg01-sd.qualcomm.com with ESMTP; 09 Aug 2020 05:16:03 -0700 Received: by stor-presley.qualcomm.com (Postfix, from userid 359480) id 7F1DC2156E; Sun, 9 Aug 2020 05:16:03 -0700 (PDT) From: Can Guo To: asutoshd@codeaurora.org, nguyenb@codeaurora.org, hongwus@codeaurora.org, rnayak@codeaurora.org, linux-scsi@vger.kernel.org, kernel-team@android.com, saravanak@google.com, salyzyn@google.com, cang@codeaurora.org Cc: Andy Gross , Bjorn Andersson , Alim Akhtar , Avri Altman , "James E.J. Bottomley" , "Martin K. Petersen" , linux-arm-msm@vger.kernel.org (open list:ARM/QUALCOMM SUPPORT), linux-kernel@vger.kernel.org (open list) Subject: [PATCH 2/9] ufs: ufs-qcom: Fix race conditions caused by func ufs_qcom_testbus_config Date: Sun, 9 Aug 2020 05:15:48 -0700 Message-Id: <1596975355-39813-3-git-send-email-cang@codeaurora.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1596975355-39813-1-git-send-email-cang@codeaurora.org> References: <1596975355-39813-1-git-send-email-cang@codeaurora.org> Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org If ufs_qcom_dump_dbg_regs() calls ufs_qcom_testbus_config() from ufshcd_suspend/resume and/or clk gate/ungate context, pm_runtime_get_sync() and ufshcd_hold() will cause racing problems. Fix this by removing the unnecessary calls of pm_runtime_get_sync() and ufshcd_hold(). Signed-off-by: Can Guo Reviewed-by: Hongwu Su Reviewed-by: Avri Altman Reviewed-by: Bean Huo Reviewed-by: Asutosh Das diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c index d0d7552..823eccf 100644 --- a/drivers/scsi/ufs/ufs-qcom.c +++ b/drivers/scsi/ufs/ufs-qcom.c @@ -1614,9 +1614,6 @@ int ufs_qcom_testbus_config(struct ufs_qcom_host *host) */ } mask <<= offset; - - pm_runtime_get_sync(host->hba->dev); - ufshcd_hold(host->hba, false); ufshcd_rmwl(host->hba, TEST_BUS_SEL, (u32)host->testbus.select_major << 19, REG_UFS_CFG1); @@ -1629,8 +1626,6 @@ int ufs_qcom_testbus_config(struct ufs_qcom_host *host) * committed before returning. */ mb(); - ufshcd_release(host->hba); - pm_runtime_put_sync(host->hba->dev); return 0; }