From patchwork Tue Jul 28 05:00:53 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Can Guo X-Patchwork-Id: 11688123 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 53FBF913 for ; Tue, 28 Jul 2020 05:02:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4380A21775 for ; Tue, 28 Jul 2020 05:02:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727045AbgG1FCa (ORCPT ); Tue, 28 Jul 2020 01:02:30 -0400 Received: from labrats.qualcomm.com ([199.106.110.90]:36697 "EHLO labrats.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726865AbgG1FCA (ORCPT ); Tue, 28 Jul 2020 01:02:00 -0400 IronPort-SDR: UgEathlvqtzvVTGnp5C2KXOUbARvWgYoC2NAr1TZyGlanM5f0kKzojsvXU4rFdRkbQVy6T+SOM T8U1iqCDX+mOye23mfyhiEqShdi57irrEkdu8CfsH+EH9drFRlI5Z8HKB4WFiwNfLOeqrBTlVz HPAVYzhbAOVtWvnFivK2ksCiyVIh4gYEn59e8bfzim4HX1y2xR3jn18ZxEnzwOmW3p0oxVfFrm Sdt8M5go3QyG8OwWZSQIC6ehq4iNjhfYzGLUY84OiaBtmnnGbgQyGpK0aMt+KtWlAhy31rgBFt Jig= X-IronPort-AV: E=Sophos;i="5.75,405,1589266800"; d="scan'208";a="29056441" Received: from unknown (HELO ironmsg01-sd.qualcomm.com) ([10.53.140.141]) by labrats.qualcomm.com with ESMTP; 27 Jul 2020 22:01:08 -0700 Received: from pacamara-linux.qualcomm.com ([192.168.140.135]) by ironmsg01-sd.qualcomm.com with ESMTP; 27 Jul 2020 22:01:07 -0700 Received: by pacamara-linux.qualcomm.com (Postfix, from userid 359480) id 8918B22DA6; Mon, 27 Jul 2020 22:01:07 -0700 (PDT) From: Can Guo To: asutoshd@codeaurora.org, nguyenb@codeaurora.org, hongwus@codeaurora.org, rnayak@codeaurora.org, sh425.lee@samsung.com, 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 v7 2/8] ufs: ufs-qcom: Fix race conditions caused by func ufs_qcom_testbus_config Date: Mon, 27 Jul 2020 22:00:53 -0700 Message-Id: <1595912460-8860-3-git-send-email-cang@codeaurora.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1595912460-8860-1-git-send-email-cang@codeaurora.org> References: <1595912460-8860-1-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 --- drivers/scsi/ufs/ufs-qcom.c | 5 ----- 1 file changed, 5 deletions(-) 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; }