From patchwork Thu Jul 23 02:34:02 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Can Guo X-Patchwork-Id: 11679603 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 233291510 for ; Thu, 23 Jul 2020 02:34:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0B47B20888 for ; Thu, 23 Jul 2020 02:34:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728914AbgGWCeY (ORCPT ); Wed, 22 Jul 2020 22:34:24 -0400 Received: from labrats.qualcomm.com ([199.106.110.90]:37589 "EHLO labrats.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387483AbgGWCeY (ORCPT ); Wed, 22 Jul 2020 22:34:24 -0400 IronPort-SDR: +CwSSzEVROfjEbwSccSiEnoU/6BReWG4pBdQdpKI4kzYJjDhT7wosgAwN4RpWStNTncQC2t1Gm WVza9yxg+sw8B0TNgJmfbb7j9iQSlqF6k7bnazOFHwlRTjHmoS4gtJVBE9+wZhMGwKtcQmueR9 Qkv68hFPHykTVt7cgqwULajs+OyJpFVebWoSi9QDxziz2Ptev621nYXtfWZ4/CAcMZ80Or0urt bcExaKu0CDOdq8Aahn1dwlSFgxAFaLq2CrXY0nHxfePb7PBxvbg4YrfTqJtQ+utXueGNtkn2mg h1Q= X-IronPort-AV: E=Sophos;i="5.75,385,1589266800"; d="scan'208";a="29047795" Received: from unknown (HELO ironmsg-SD-alpha.qualcomm.com) ([10.53.140.30]) by labrats.qualcomm.com with ESMTP; 22 Jul 2020 19:34:23 -0700 Received: from pacamara-linux.qualcomm.com ([192.168.140.135]) by ironmsg-SD-alpha.qualcomm.com with ESMTP; 22 Jul 2020 19:34:21 -0700 Received: by pacamara-linux.qualcomm.com (Postfix, from userid 359480) id 3482A22A4D; Wed, 22 Jul 2020 19:34:20 -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 v5 3/9] ufs: ufs-qcom: Fix race conditions caused by func ufs_qcom_testbus_config Date: Wed, 22 Jul 2020 19:34:02 -0700 Message-Id: <1595471649-25675-4-git-send-email-cang@codeaurora.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1595471649-25675-1-git-send-email-cang@codeaurora.org> References: <1595471649-25675-1-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 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 --- 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; }