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 v2 3/4] ufs: ufs-qcom: Fix a few BUGs in func ufs_qcom_dump_dbg_regs()
Date: Mon, 13 Jul 2020 19:28:11 -0700 [thread overview]
Message-ID: <1594693693-22466-4-git-send-email-cang@codeaurora.org> (raw)
In-Reply-To: <1594693693-22466-1-git-send-email-cang@codeaurora.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 <cang@codeaurora.org>
---
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);
+ }
}
/**
--
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.
next prev parent reply other threads:[~2020-07-14 2:28 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1594693693-22466-1-git-send-email-cang@codeaurora.org>
2020-07-14 2:28 ` [PATCH v2 1/4] scsi: ufs: Add checks before setting clk-gating states Can Guo
2020-07-14 3:38 ` Bart Van Assche
2020-07-14 4:11 ` Can Guo
2020-07-14 2:28 ` [PATCH v2 2/4] scsi: ufs: Fix imbalanced scsi_block_reqs_cnt caused by ufshcd_hold() Can Guo
2020-07-14 3:41 ` Bart Van Assche
2020-07-14 4:11 ` Can Guo
2020-07-14 2:28 ` Can Guo [this message]
2020-07-14 3:47 ` [PATCH v2 3/4] ufs: ufs-qcom: Fix a few BUGs in func ufs_qcom_dump_dbg_regs() Bart Van Assche
2020-07-14 4:17 ` Can Guo
2020-07-14 2:28 ` [PATCH v2 4/4] scsi: ufs: Fix up and simplify error recovery mechanism Can Guo
2020-07-14 3:52 ` Bart Van Assche
2020-07-14 4:26 ` Can Guo
2020-07-14 9:13 ` Can Guo
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