From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: stable@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
patches@lists.linux.dev,
Lorenzo Pieralisi <lpieralisi@kernel.org>,
Hanjun Guo <guohanjun@huawei.com>,
Sudeep Holla <sudeep.holla@arm.com>,
"Rafael J. Wysocki" <rafael@kernel.org>,
Len Brown <lenb@kernel.org>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Mike Leach <mike.leach@linaro.org>,
James Clark <james.clark@arm.com>, Leo Yan <leo.yan@linaro.org>,
linux-acpi@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, coresight@lists.linaro.org,
Anshuman Khandual <anshuman.khandual@arm.com>,
Sasha Levin <sashal@kernel.org>
Subject: [PATCH 6.6 442/744] coresight: etm4x: Fix unbalanced pm_runtime_enable()
Date: Thu, 6 Jun 2024 16:01:54 +0200 [thread overview]
Message-ID: <20240606131746.671142501@linuxfoundation.org> (raw)
In-Reply-To: <20240606131732.440653204@linuxfoundation.org>
6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Anshuman Khandual <anshuman.khandual@arm.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@kernel.org>
Cc: Hanjun Guo <guohanjun@huawei.com>
Cc: Sudeep Holla <sudeep.holla@arm.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Len Brown <lenb@kernel.org>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: James Clark <james.clark@arm.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: linux-acpi@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Cc: coresight@lists.linaro.org
Fixes: 5214b563588e ("coresight: etm4x: Add support for sysreg only devices")
Reviewed-by: James Clark <james.clark@arm.com>
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20240314055843.2625883-2-anshuman.khandual@arm.com
Signed-off-by: Sasha Levin <sashal@kernel.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 18c4544f60454..003245a791a23 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x-core.c
+++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c
@@ -2175,6 +2175,9 @@ static int etm4_probe_platform_dev(struct platform_device *pdev)
ret = etm4_probe(&pdev->dev);
pm_runtime_put(&pdev->dev);
+ if (ret)
+ pm_runtime_disable(&pdev->dev);
+
return ret;
}
--
2.43.0
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next parent reply other threads:[~2024-06-06 14:18 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20240606131732.440653204@linuxfoundation.org>
2024-06-06 14:01 ` Greg Kroah-Hartman [this message]
2024-06-06 14:03 ` [PATCH 6.6 525/744] perf test: Add a test for strcmp_cpuid_str() expression Greg Kroah-Hartman
2024-06-06 14:03 ` [PATCH 6.6 526/744] perf pmu: Move pmu__find_core_pmu() to pmus.c Greg Kroah-Hartman
2024-06-06 14:03 ` [PATCH 6.6 527/744] perf pmu: "Compat" supports regular expression matching identifiers Greg Kroah-Hartman
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