From patchwork Fri Jul 31 08:08:02 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Can Guo X-Patchwork-Id: 11694361 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 B6FD013B1 for ; Fri, 31 Jul 2020 08:08:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9CC1120829 for ; Fri, 31 Jul 2020 08:08:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731798AbgGaIIU (ORCPT ); Fri, 31 Jul 2020 04:08:20 -0400 Received: from labrats.qualcomm.com ([199.106.110.90]:9740 "EHLO labrats.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731616AbgGaIIS (ORCPT ); Fri, 31 Jul 2020 04:08:18 -0400 IronPort-SDR: VI8kD2VOQN0kWAu9aHIlqog4uk1CYpPsxYvN7Ntst+087oCCHSmbARtw6Cri98+3j9Wqi9Vc+u QzT/uYj2S3PrtsOboLY9LzicV4NSNyGWrqHQz0VLgQeCWTiqjPf+lv352d5JIMXFNrJP8mATvR 7wO53wIMGvYFKC/HXIcwkOQnKh9CYxaldEtBpedb+H8wn40rhSa4Vf6jCVd74uM33oaszmCsZh QYJ0KQ9MeUv9DFD9bLtoVU38t4XXUKHwohgU2uasW9YoOjP2b2KkqFEyHov4LvzgEoHbG9RCX9 l9U= X-IronPort-AV: E=Sophos;i="5.75,417,1589266800"; d="scan'208";a="29059978" Received: from unknown (HELO ironmsg03-sd.qualcomm.com) ([10.53.140.143]) by labrats.qualcomm.com with ESMTP; 31 Jul 2020 01:08:17 -0700 Received: from pacamara-linux.qualcomm.com ([192.168.140.135]) by ironmsg03-sd.qualcomm.com with ESMTP; 31 Jul 2020 01:08:16 -0700 Received: by pacamara-linux.qualcomm.com (Postfix, from userid 359480) id DD62822E73; Fri, 31 Jul 2020 01:08:16 -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 2/8] ufs: ufs-qcom: Fix race conditions caused by func ufs_qcom_testbus_config Date: Fri, 31 Jul 2020 01:08:02 -0700 Message-Id: <1596182890-10086-3-git-send-email-cang@codeaurora.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1596182890-10086-1-git-send-email-cang@codeaurora.org> References: <1596182890-10086-1-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 diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c index 2e6ddb5..7da27ee 100644 --- a/drivers/scsi/ufs/ufs-qcom.c +++ b/drivers/scsi/ufs/ufs-qcom.c @@ -1604,9 +1604,6 @@ 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); @@ -1619,8 +1616,6 @@ 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; }