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From: Can Guo <cang@codeaurora.org>
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 <agross@kernel.org>,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	Alim Akhtar <alim.akhtar@samsung.com>,
	Avri Altman <avri.altman@wdc.com>,
	"James E.J. Bottomley" <jejb@linux.ibm.com>,
	"Martin K. Petersen" <martin.petersen@oracle.com>,
	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 07:07:50 -0700
Message-ID: <1596204478-5420-3-git-send-email-cang@codeaurora.org> (raw)
In-Reply-To: <1596204478-5420-1-git-send-email-cang@codeaurora.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 <cang@codeaurora.org>
Reviewed-by: Hongwu Su <hongwus@codeaurora.org>
Reviewed-by: Avri Altman <avri.altman@wdc.com>
Reviewed-by: Bean Huo <beanhuo@micron.com>

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;
 }
-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.


  parent reply index

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-31 14:07 [RESEND PATCH v8 0/8] Fix up and simplify error recovery mechanism Can Guo
2020-07-31 14:07 ` [PATCH 1/8] scsi: ufs: Add checks before setting clk-gating states Can Guo
2020-07-31 14:07 ` Can Guo [this message]
2020-07-31 14:07 ` [PATCH 3/8] scsi: ufs-qcom: Remove testbus dump in ufs_qcom_dump_dbg_regs Can Guo
2020-07-31 14:07 ` [PATCH 4/8] scsi: ufs: Add some debug infos to ufshcd_print_host_state Can Guo
2020-07-31 14:07 ` [PATCH 5/8] scsi: ufs: Fix concurrency of error handler and other error recovery paths Can Guo
2020-07-31 14:07 ` [PATCH 6/8] scsi: ufs: Recover hba runtime PM error in error handler Can Guo
2020-07-31 14:07 ` [PATCH 7/8] scsi: ufs: Move dumps in IRQ handler to " Can Guo
2020-07-31 14:07 ` [PATCH 8/8] scsi: ufs: Fix a racing problem btw error handler and runtime PM ops Can Guo
  -- strict thread matches above, loose matches on Subject: below --
2020-07-31  8:08 [PATCH v8 0/8] Fix up and simplify error recovery mechanism Can Guo
2020-07-31  8:08 ` [PATCH 2/8] ufs: ufs-qcom: Fix race conditions caused by func ufs_qcom_testbus_config Can Guo

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