From patchwork Mon Jul 13 04:57:11 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Can Guo X-Patchwork-Id: 11658693 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 90037722 for ; Mon, 13 Jul 2020 05:03:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7811C207BC for ; Mon, 13 Jul 2020 05:03:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728696AbgGMFDd (ORCPT ); Mon, 13 Jul 2020 01:03:33 -0400 Received: from labrats.qualcomm.com ([199.106.110.90]:31904 "EHLO labrats.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725826AbgGMFDc (ORCPT ); Mon, 13 Jul 2020 01:03:32 -0400 X-Greylist: delayed 364 seconds by postgrey-1.27 at vger.kernel.org; Mon, 13 Jul 2020 01:03:31 EDT IronPort-SDR: JfArKeZ9A2bw0skOq60v6blC1tY8ZhO8aNa9Tk7WprCo5/lMywAE2kYHzZbSzTE1Sz6/A2BXMl esKJwZGWOJqHFBb4xKwtFzQ91hfNYz7zOe3yggWZsBsPeibt+60AXi2iCwfmsx42sN7LtLRVKM NJLwq0VDYugC0BRBR6jexc8bGyHOC+9JfUQANW4Ix0j3RUJtF3cfV40P16jK7nN83w1wmbtwyI K5x7XpplJdGr+dyn0C8VbEOF6AyormNSgxLfB9MYhGmv00l3+G7q8nqyuVKUsPpzuj9IqAVCJZ GsQ= X-IronPort-AV: E=Sophos;i="5.75,346,1589266800"; d="scan'208";a="47215537" Received: from unknown (HELO ironmsg03-sd.qualcomm.com) ([10.53.140.143]) by labrats.qualcomm.com with ESMTP; 12 Jul 2020 21:57:27 -0700 Received: from pacamara-linux.qualcomm.com ([192.168.140.135]) by ironmsg03-sd.qualcomm.com with ESMTP; 12 Jul 2020 21:57:26 -0700 Received: by pacamara-linux.qualcomm.com (Postfix, from userid 359480) id 8250322DAF; Sun, 12 Jul 2020 21:57:26 -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 v1 3/4] ufs: ufs-qcom: Fix a few BUGs in func ufs_qcom_dump_dbg_regs() Date: Sun, 12 Jul 2020 21:57:11 -0700 Message-Id: <1594616232-25080-4-git-send-email-cang@codeaurora.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1594616232-25080-1-git-send-email-cang@codeaurora.org> References: <1594616232-25080-1-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 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); + } } /**