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Message-ID: <20250507063716.1945213-1-quic_jinlmao@quicinc.com>
Date: Tue, 6 May 2025 23:37:16 -0700
From: Mao Jinlong <quic_jinlmao@...cinc.com>
To: Suzuki K Poulose <suzuki.poulose@....com>,
Mike Leach
<mike.leach@...aro.org>,
James Clark <james.clark@...aro.org>,
"Alexander
Shishkin" <alexander.shishkin@...ux.intel.com>,
Yabin Cui <yabinc@...gle.com>
CC: Mao Jinlong <quic_jinlmao@...cinc.com>, <coresight@...ts.linaro.org>,
<linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
<linux-arm-msm@...r.kernel.org>,
Yuanfang Zhang <quic_yuanfang@...cinc.com>
Subject: [PATCH v2] coresight: tmc: fix failure to disable/enable ETF after reading
ETF may fail to re-enable after reading, and driver->reading will
not be set to false, this will cause failure to enable/disable to ETF.
This change set driver->reading to false even if re-enabling fail.
Fixes: 669c4614236a ("coresight: tmc: Don't enable TMC when it's not ready.")
Co-developed-by: Yuanfang Zhang <quic_yuanfang@...cinc.com>
Signed-off-by: Yuanfang Zhang <quic_yuanfang@...cinc.com>
Signed-off-by: Mao Jinlong <quic_jinlmao@...cinc.com>
---
drivers/hwtracing/coresight/coresight-tmc-etf.c | 7 +------
1 file changed, 1 insertion(+), 6 deletions(-)
diff --git a/drivers/hwtracing/coresight/coresight-tmc-etf.c b/drivers/hwtracing/coresight/coresight-tmc-etf.c
index d858740001c2..c9e2d95ae295 100644
--- a/drivers/hwtracing/coresight/coresight-tmc-etf.c
+++ b/drivers/hwtracing/coresight/coresight-tmc-etf.c
@@ -747,7 +747,6 @@ int tmc_read_unprepare_etb(struct tmc_drvdata *drvdata)
char *buf = NULL;
enum tmc_mode mode;
unsigned long flags;
- int rc = 0;
/* config types are set a boot time and never change */
if (WARN_ON_ONCE(drvdata->config_type != TMC_CONFIG_TYPE_ETB &&
@@ -773,11 +772,7 @@ int tmc_read_unprepare_etb(struct tmc_drvdata *drvdata)
* can't be NULL.
*/
memset(drvdata->buf, 0, drvdata->size);
- rc = __tmc_etb_enable_hw(drvdata);
- if (rc) {
- raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
- return rc;
- }
+ __tmc_etb_enable_hw(drvdata);
} else {
/*
* The ETB/ETF is not tracing and the buffer was just read.
--
2.25.1
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