linux-kernel - [PATCH 5.15 201/402] coresight: etm4x: Fix unbalanced pm_runtime

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Message-ID: <20240613113309.983930117@linuxfoundation.org>
Date: Thu, 13 Jun 2024 13:32:38 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: stable@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	patches@...ts.linux.dev,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Hanjun Guo <guohanjun@...wei.com>,
	Sudeep Holla <sudeep.holla@....com>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Len Brown <lenb@...nel.org>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Mike Leach <mike.leach@...aro.org>,
	James Clark <james.clark@....com>,
	Leo Yan <leo.yan@...aro.org>,
	linux-acpi@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	coresight@...ts.linaro.org,
	Anshuman Khandual <anshuman.khandual@....com>,
	Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 201/402] coresight: etm4x: Fix unbalanced pm_runtime_enable()

5.15-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Anshuman Khandual <anshuman.khandual@....com>

[ Upstream commit caa41c47dab7e1054f587e592ab21296e3a6781c ]

There is an unbalanced pm_runtime_enable() in etm4_probe_platform_dev()
when etm4_probe() fails. This problem can be observed via the coresight
etm4 module's (load -> unload -> load) sequence when etm4_probe() fails
in etm4_probe_platform_dev().

[   63.379943] coresight-etm4x 7040000.etm: Unbalanced pm_runtime_enable!
[   63.393630] coresight-etm4x 7140000.etm: Unbalanced pm_runtime_enable!
[   63.407455] coresight-etm4x 7240000.etm: Unbalanced pm_runtime_enable!
[   63.420983] coresight-etm4x 7340000.etm: Unbalanced pm_runtime_enable!
[   63.420999] coresight-etm4x 7440000.etm: Unbalanced pm_runtime_enable!
[   63.441209] coresight-etm4x 7540000.etm: Unbalanced pm_runtime_enable!
[   63.454689] coresight-etm4x 7640000.etm: Unbalanced pm_runtime_enable!
[   63.474982] coresight-etm4x 7740000.etm: Unbalanced pm_runtime_enable!

This fixes the above problem - with an explicit pm_runtime_disable() call
when etm4_probe() fails during etm4_probe_platform_dev().

Cc: Lorenzo Pieralisi <lpieralisi@...nel.org>
Cc: Hanjun Guo <guohanjun@...wei.com>
Cc: Sudeep Holla <sudeep.holla@....com>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>
Cc: Len Brown <lenb@...nel.org>
Cc: Suzuki K Poulose <suzuki.poulose@....com>
Cc: Mike Leach <mike.leach@...aro.org>
Cc: James Clark <james.clark@....com>
Cc: Leo Yan <leo.yan@...aro.org>
Cc: linux-acpi@...r.kernel.org
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org
Cc: coresight@...ts.linaro.org
Fixes: 5214b563588e ("coresight: etm4x: Add support for sysreg only devices")
Reviewed-by: James Clark <james.clark@....com>
Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
Link: https://lore.kernel.org/r/20240314055843.2625883-2-anshuman.khandual@arm.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/hwtracing/coresight/coresight-etm4x-core.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/hwtracing/coresight/coresight-etm4x-core.c b/drivers/hwtracing/coresight/coresight-etm4x-core.c
index 26d0d4485ae99..3f5e9400222e7 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x-core.c
+++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c
@@ -2022,6 +2022,9 @@ static int etm4_probe_platform_dev(struct platform_device *pdev)
 	ret = etm4_probe(&pdev->dev, NULL, 0);
 
 	pm_runtime_put(&pdev->dev);
+	if (ret)
+		pm_runtime_disable(&pdev->dev);
+
 	return ret;
 }
 
-- 
2.43.0