From patchwork Mon Jul 20 06:35:50 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Can Guo X-Patchwork-Id: 11672945 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 24A231392 for ; Mon, 20 Jul 2020 06:36:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 159C220709 for ; Mon, 20 Jul 2020 06:36:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726612AbgGTGgL (ORCPT ); Mon, 20 Jul 2020 02:36:11 -0400 Received: from labrats.qualcomm.com ([199.106.110.90]:5831 "EHLO labrats.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726821AbgGTGgK (ORCPT ); Mon, 20 Jul 2020 02:36:10 -0400 IronPort-SDR: CLDaHBzZ4YJFjYnJGf+W5/f3sQkr5yeCMqB9PsXjSmm8RRB5BFLqqsGxHvqaKhgHNkqlJhEoP7 a+hE3aHo0K3KL1Z+sSAiln/4HNswSjQVwPhEcNyL29D+h2szfHezRAeYWAVKxevxOeuu0AalJ3 CRqb+u4NZvxXwDZ+O4DAJf6RrqNc6jfxUtk1EPaWI+sNyLsYnT+W409VZFwL4Oa6unHDz5W9H5 AGGFWWBsNteUPWaAI76tKiymRsfyYRNnnqM8Ct5t73z0YV5GceVCywNI2ZW1gx0Kj/rKdaB0sV umE= X-IronPort-AV: E=Sophos;i="5.75,374,1589266800"; d="scan'208";a="47226982" Received: from unknown (HELO ironmsg05-sd.qualcomm.com) ([10.53.140.145]) by labrats.qualcomm.com with ESMTP; 19 Jul 2020 23:36:08 -0700 Received: from pacamara-linux.qualcomm.com ([192.168.140.135]) by ironmsg05-sd.qualcomm.com with ESMTP; 19 Jul 2020 23:36:07 -0700 Received: by pacamara-linux.qualcomm.com (Postfix, from userid 359480) id 8549B22DA5; Sun, 19 Jul 2020 23:36:07 -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 v4 3/8] ufs: ufs-qcom: Fix a few BUGs in func ufs_qcom_dump_dbg_regs() Date: Sun, 19 Jul 2020 23:35:50 -0700 Message-Id: <1595226956-7779-4-git-send-email-cang@codeaurora.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1595226956-7779-1-git-send-email-cang@codeaurora.org> References: <1595226956-7779-1-git-send-email-cang@codeaurora.org> Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Dumping testbus registers needs to sleep a bit intermittently as there are too many of them. Skip them for those contexts where sleep is not allowed. Meanwhile, 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 it by removing the unnecessary calls of pm_runtime_get_sync() and ufshcd_hold(). Signed-off-by: Can Guo --- drivers/scsi/ufs/ufs-qcom.c | 17 +++++++---------- 1 file changed, 7 insertions(+), 10 deletions(-) diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c index 2e6ddb5..3743c17 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; } @@ -1658,11 +1653,13 @@ static void ufs_qcom_dump_dbg_regs(struct ufs_hba *hba) /* sleep a bit intermittently as we are dumping too much data */ ufs_qcom_print_hw_debug_reg_all(hba, NULL, ufs_qcom_dump_regs_wrapper); - udelay(1000); - ufs_qcom_testbus_read(hba); - udelay(1000); - ufs_qcom_print_unipro_testbus(hba); - udelay(1000); + if (in_task()) { + udelay(1000); + ufs_qcom_testbus_read(hba); + udelay(1000); + ufs_qcom_print_unipro_testbus(hba); + udelay(1000); + } } /**