| Message ID | 20240123054608.1790189-2-anshuman.khandual@arm.com (mailing list archive) |
|---|---|
| State | Handled Elsewhere, archived |
| Headers | show |
| Series | coresight: Move remaining AMBA ACPI devices into platform driver | expand |
On 23/01/2024 05:45, Anshuman Khandual wrote: > 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(). Fixes: 5214b563588e ("coresight: etm4x: Add support for sysreg only devices" > > 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 > Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> > --- > Changes in V4: > > - New patch in the series > > 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 ce1995a2827f..7c693b45ac05 100644 > --- a/drivers/hwtracing/coresight/coresight-etm4x-core.c > +++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c > @@ -2217,6 +2217,9 @@ 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; > } > Looks good to me. I have glanced through the other platform device driver code in coresight subsystem and they all seem to be safe, except for Ultrasoc-smb, which doesn't do any power managment. It may be, because it is only supported on an ACPI system. Suzuki
On 2/15/24 16:34, Suzuki K Poulose wrote: > On 23/01/2024 05:45, Anshuman Khandual wrote: >> 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(). > > Fixes: 5214b563588e ("coresight: etm4x: Add support for sysreg only devices" Sure, will add this 'Fixes' tag here. > >> >> 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 >> Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> >> --- >> Changes in V4: >> >> - New patch in the series >> >> 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 ce1995a2827f..7c693b45ac05 100644 >> --- a/drivers/hwtracing/coresight/coresight-etm4x-core.c >> +++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c >> @@ -2217,6 +2217,9 @@ 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; >> } >> > > Looks good to me. I have glanced through the other platform device driver code in coresight subsystem and they all seem to be safe, except > for Ultrasoc-smb, which doesn't do any power managment. It may be, because it is only supported on an ACPI system. Understood.
diff --git a/drivers/hwtracing/coresight/coresight-etm4x-core.c b/drivers/hwtracing/coresight/coresight-etm4x-core.c index ce1995a2827f..7c693b45ac05 100644 --- a/drivers/hwtracing/coresight/coresight-etm4x-core.c +++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c @@ -2217,6 +2217,9 @@ 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; }
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 Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> --- Changes in V4: - New patch in the series drivers/hwtracing/coresight/coresight-etm4x-core.c | 3 +++ 1 file changed, 3 insertions(+)