From: Anshuman Khandual anshuman.khandual@arm.com mainline inclusion from mainline-v6.11-rc1 commit caa41c47dab7e1054f587e592ab21296e3a6781c category: bugfix bugzilla:https://gitee.com/openeuler/kernel/issues/IAKVLJ Reference:https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i... -------------------------------- coresight: etm4x: Fix unbalanced pm_runtime_enable() 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 Signed-off-by: Wang Lian dev01404@linx-info.com Link: https://lore.kernel.org/r/20240314055843.2625883-2-anshuman.khandual@arm.com --- 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 87cfd60ee..98db96a80 100644 --- a/drivers/hwtracing/coresight/coresight-etm4x-core.c +++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c @@ -2088,6 +2088,9 @@ 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; }